Microwave detector and manufacturing method thereof and stray electromagnetic radiation suppression method

The present invention discloses a microwave detector and manufacturing method thereof and stray electromagnetic radiation suppression method, wherein the microwave detector includes a reference ground, a radiation source, a driving circuit, and at least a set of suppression fence posts. The driving circuit is electrically connected with the feed point of the radiating source, wherein the radiating source, the reference ground and the driving circuit are arranged in order along the thickness direction of the microwave detector. The radiation source and the reference ground are separated and spaced to form and define a radiating gap between the radiation source and the reference ground, wherein a spacing distance between the reference ground and the driving circuit is greater than or equal to 1/128λ, wherein λ is the wavelength of the radiated wave of the microwave detector. The set of suppression fence posts surrounds the driving circuit in such a manner that the suppression fence posts are respectively and spacingly arranged on the side portions of the driving circuit.

BACKGROUND OF THE PRESENT INVENTION

Field of Invention

The present invention relates to antenna technology, and more particularly to a microwave detector and manufacturing method thereof and stray electromagnetic radiation suppression method.

Description of Related Arts

With developing and popularizing of IOT (Internet of things), IOT applications in the field of Artificial Intelligence (AI) and intelligent home have become more and more common. Here, radiological technologies including radio detecting methods based on Doppler Effect are especially widely utilized since they are capable of serving as a critical connection between humans and/or objects. The ISM (Industrial Scientific Medical) Bands, defined by the ITU-R (ITU Radio Communication Sector), are the bands opened for organizations of industry, science and medical purposes without licensing required. Some bands in the ISM bands opened by ITU-R and applied in microwave detection include 2.4 GHz, 5.8 GHz, 10.525 GHz, 24.125 GHz, and etc. Corresponding microwave detectors in the bands need to be limited in a certain regulated emissive power (generally less than 1 W) in order to reduce the interference to other radio devices. Although the definitions and the licenses of the bands could regularize the use of the bands to decrease the risk of interference to radio devices in different bands, nevertheless unilateral or bilateral interferences may still occur between radio devices of various bands, such as microwave detectors of different bands, due to stray electromagnetic radiation. Especially, within the limited licensed bands, increasing coverage rate of the used radio bands can render more and more serious problems in unilateral or bilateral interferences between radio devices of different bands.

Besides, because the radio technology in the same time are the essence of information transfer in the field of communication, the ability of anti-interference thereof relates to the safety of the economy and national defense. Therefore, there are corresponding national and international certification standards of the ability of anti-interference in the field of radio technology, such as RED certification in the Europe Union (EU) and FCC certification in the United States (U.S.) which require the limitation of harmonic of stray electromagnetic radiation. In other word, even though the microwave detectors based on the theory of Doppler Effect use some bands which require no license, the problems thereof about unilateral or bilateral interference between radio equipment in different bands should be dealt with, as well as the problems about the certification standard international and respective countries and regions.

Conventional microwave detector comprises a radiation source, a reference ground and a driving circuit, wherein the radiation source and the reference ground are spacingly arranged in order to form and define a radiating clearance. The driving circuit is installed at the same side of the reference ground and is electrically connected with a feed point of the radiation source. The driving circuit provides microwave excitation electrical signal from the feed point of the radiation source to the radiation source, so that the microwave detector radiates waves due to the cooperation between the radiation source and the reference ground. Unfortunately, the driving circuit also radiates stray electromagnetic radiation at the same time from the reference ground to the driving circuit, diffusing out from the gap between the reference ground and the driving circuit, which can permeates through other radio devices of different bands from the microwave detector, such as permeating through other microwave detector of a different band from the microwave detector causing interference.

In other words, because of the existence of the stray electromagnetic radiation, conventional microwave detector would cause unilateral or bilateral interference to other radio devices of different band including other microwave detectors of different bands. This problem becomes more and more serious day by day, resulting that it is so difficult for the conventional devices to meet the requirement of the RED certification of the EU and the FCC certification of the U.S. regarding the restriction of the harmonic wave from stray electromagnetic radiation.

SUMMARY OF THE PRESENT INVENTION

The invention is advantageous in that it provides a microwave detector and manufacturing method thereof and stray electromagnetic radiation suppression method, wherein when a driving circuit of the microwave detector provides microwave excitation electrical signal to a radiation source, any stray electromagnetic radiation generated at the same time can be suppressed effectively.

The invention is advantageous in that it provides a microwave detector and manufacturing method thereof and stray electromagnetic radiation suppression method, wherein the microwave detector provides at least one set of suppression fence posts, wherein the set of the suppression fence posts surrounds the driving circuit in a manner that the suppression fence posts are spacingly and intervally arranged around side portions of the driving circuit towards a direction of a reference ground of the microwave detector, so as to suppress the stray electromagnetic radiation generated by the driving circuit with one set of the suppression fence posts.

The invention is advantageous in that it provides a microwave detector and manufacturing method thereof and stray electromagnetic radiation suppression method, wherein the microwave detector includes at least one row of suppression dams, wherein the row of the suppression dams is mounted between adjacent circuit modules of the driving circuit, so as to suppress the stray electromagnetic radiation generated by the driving circuit and lower the interference to other adjacent circuit modules caused by the stray electromagnetic radiation generated by the driving circuit.

The invention is advantageous in that it provides a microwave detector and manufacturing method thereof and stray electromagnetic radiation suppression method, wherein the microwave detector provides a shield member, arranged to cover the driving circuit, so as to suppress the stray electromagnetic radiation generated by the driving circuit.

The invention is advantageous in that it provides a microwave detector and manufacturing method thereof and stray electromagnetic radiation suppression method, wherein the shield member has at least two adjacent shielded spaces respectively corresponding to different circuit modules of the driving circuit, so that the shield member is able to divide and separate the adjacent circuit modules of the driving circuit thereby, so as to suppress the interference to other adjacent circuit modules caused by the stray electromagnetic radiation generated by the driving circuit.

The invention is advantageous in that it provides a microwave detector and manufacturing method thereof and stray electromagnetic radiation suppression method, wherein the span between the reference ground and the driving circuit is decreased, so as to suppress the stray electromagnetic radiation generated by the driving circuit.

The invention is advantageous in that it provides a microwave detector and manufacturing method thereof and stray electromagnetic radiation suppression method, wherein at least one shielded space of the shield member further comprises a wave absorption material arranged therein, adapted for absorbing stray electromagnetic radiation, so as to deplete and reduce the interference to the driving circuit and the adjacent circuit module(s) rendered by the secondary reflection of the stray electromagnetic radiation generated by the circuit module in the shielded space.

According to an aspect of the present invention, it provides a microwave detector, which comprises:

a reference ground;

a radiation source, having a feed point;

a driving circuit electrically connected with the feed point of the radiating source, wherein the radiating source, the reference ground and the driving circuit are arranged and disposed in order along a thickness direction of the microwave detector, wherein the radiation source and the reference ground are separated and spaced so as to form and define a radiating clearance between the radiation source and the reference ground, wherein a spacing distance between the reference ground and the driving circuit is greater than or equal to 1/128λ, wherein λ is the wavelength of the radiated wave of the microwave detector; and

at least one set of suppression fence posts, wherein the suppression fence posts are respectively and spacingly and intervally arranged around side portions of the driving circuit to surround the driving circuit.

In one embodiment of the present invention, the microwave detector further comprises an upper base layer and a lower base layer, wherein the upper base layer has an attaching side and a mounting side corresponding to the attaching side, wherein the radiation source is retained on an attaching side of the upper base layer, wherein the lower base layer has an upper surface and a lower surface corresponding to the upper surface, wherein the reference ground is retained on the upper surface of the lower base layer and the driving circuit is retained on the lower surface of the lower base layer, such that the lower base layer separates the reference ground and the driving circuit, wherein the mounting side of the upper base layer is mounted on the reference ground, so as to allow the upper base layer to form and define the radiating clearance.

In one embodiment of the present invention, the microwave detector further comprises an etched layer, which comprises a peripheral portion, laminated on the lower surface of the lower base layer in such a manner that the peripheral portion surrounds the driving circuit, wherein the suppression fence posts of the set of the suppression fence posts are respectively extended from the peripheral portion toward the direction of the reference ground.

In one embodiment of the present invention, the etched layer comprises at least a partition portion, layered on the lower surface of the lower base layer in the manner of separating adjacent circuit modules of the driving circuit, wherein the microwave detector further comprises at least a row of suppression dams, extended from the partition portion toward the direction of the reference ground in such a manner that the suppression dams are spacingly and intervally arranged with each other so as to separate the adjacent circuit modules of the driving circuit.

In one embodiment of the present invention, the microwave detector further comprises at least a row of suppression dams extended from the lower surface of the lower base layer toward the direction of the reference ground in such a manner that the suppression dams are spacingly and intervally arranged with each other so as to separate the adjacent circuit modules of the driving circuit.

In one embodiment of the present invention, each of the suppression fence posts of the set of the suppression fence posts is extended from the peripheral portion to the reference ground.

In one embodiment of the present invention, each of the suppression fence posts of the set of the suppression fence posts is extended from the peripheral portion to the reference ground, wherein each of the suppression dams of the row of the suppression dams is extended from the partition portion to the reference ground.

In one embodiment of the present invention, each of the suppression fence posts of the set of the suppression fence posts is extended from the peripheral portion to the reference ground, wherein each of the suppression dams of the row of the suppression dams is extended from the lower surface of the lower base layer to the reference ground.

In one embodiment of the present invention, the upper base layer is layered on the reference ground.

In one embodiment of the present invention, the microwave detector further comprises a shield member, wherein the shield member comprises a shield wall and has a shielded space defined by the shield wall, wherein the shield member is arranged in such a manner that the shield wall is corresponding to a set of the suppression fence posts, so as to allow the driving circuit being disposed in the shielded space that is further defined by the suppression fence posts and the reference ground.

In one embodiment of the present invention, the microwave detector further comprises a shield member, wherein the shield member comprises a shield wall, at least a division member arranged on the shield wall, and at least two independent shielded spaces formed and defined by the shield wall and the division member, wherein the shield member is arranged in such a manner that, the shield wall is corresponding to a set of the suppression fence posts and the division member is corresponding to a row of the suppression dams, so as to allow every circuit module of the driving circuit to be respectively disposed in the corresponding shielded space of the shield member.

In accordance with another aspect of the invention, the present invention further provides a manufacturing method of microwave detector, comprising the following steps:

(a) etching a second metal layer that is attached on an upper surface of a lower base layer, so as to allow the second metal layer to form a notch, and etching a third metal layer that is attached on a lower surface of the lower base layer, so as to allow the third metal layer forming a driving circuit;

(b) forming at least a set of suppression fence posts surrounding at least one side of the driving circuit;

(c) allowing a mounting side of an upper base layer, which has a first metal layer attached on an attaching side thereof, being mounted on the second metal layer; and

(d) forming an electrical connection element extended from the first metal layer to the driving circuit via the notch of the second metal layer, so as to make the microwave detector, wherein the first metal layer forms a radiation source of the microwave detector, the second metal layer forms a reference ground of the microwave detector, and the upper base layer forms a radiating clearance of the microwave detector.

In one embodiment of the present invention, the step (c) is prior to the step (d), such that the mounting side of the upper base layer is mounted on the second metal layer first, and then the set of suppression fence posts is formed around the side portions of the driving circuit.

In one embodiment of the present invention, in the step (a), the middle portion of the third metal layer is etched, so that a periphery of the third metal layer forms a peripheral portion surrounding the driving circuit, which allows the suppression fence posts of the set of suppression fence posts to spacingly and intervally extended from the peripheral portion towards a direction of the second metal layer in the step (b).

In one embodiment of the present invention, in the step (a), the middle portion of the third metal layer is etched, so that a middle portion of the third metal layer forms at least a partition portion to separate and divide adjacent circuit modules of the driving circuit, such that, before the step (c), the manufacturing method further comprises a step of:

(e) forming at least a row of suppression dams from the partition portion to the second metal layer.

In one embodiment of the present invention, prior to the step (c), the manufacturing method further comprises a step of:

(f) forming at least a row of suppression dams from the lower surface of the lower base layer, extending toward the direction of the second metal layer, so as to divide the adjacent circuit modules of the driving circuit.

In one embodiment of the present invention, the step (b) and the step (e) are conducted at the same time, so as to simultaneously form the set of suppression fence posts and the row of suppression dams by, for example, Vertical Interconnect Access (VIA) and metallization through-VIA technology.

In one embodiment of the present invention, the step (b) and the step (f) are conducted at the same time, so as to simultaneously form a set of the suppression fence posts and a row of the suppression dams by, for example, VIA and metallization through-VIA technology.

In one embodiment of the present invention, the manufacture method further comprises a step of:

(g) arranging and covering a shield member on the driving circuit such that a shield wall of the shield member is corresponding to the set of suppression fence posts.

In one embodiment of the present invention, the manufacture method further comprises a step of:

(h) arranging and covering a shield member on the driving circuit such that a shield wall of the shield member is corresponding to the set of suppression fence posts and that a division member of the shield member is corresponding to the row of suppression dams.

In accordance with another aspect of the invention, the present invention further provides a stray electromagnetic radiation suppression method for microwave detector, comprising the following steps:

(A) arranging at least a set of suppression fence posts around a driving circuit of the microwave detector along at least one side of the driving circuit; and

(B) preventing a stray electromagnetic radiation generated by the driving circuit from radiating to a direction of the at least one side of the driving circuit with the set of suppression fence posts when a microwave excitation electrical signal is provided from a feed point of a radiation source of the microwave detector to the radiation source by the driving circuit, so as to suppress the stray electromagnetic radiation generated by the driving circuit.

In one embodiment of the present invention, the stray electromagnetic radiation suppression method further comprises a step of:

(C) dividing adjacent circuit modules of the driving circuit so as to weaken the stray electromagnetic radiation generated by the driving circuit.

In one embodiment of the present invention, in the step (C), at least a row of suppression dams is formed between the adjacent circuit modules of the driving circuit, such that the row of suppression dams divides the adjacent circuit modules of the driving circuit.

In one embodiment of the present invention, in the step (C), each circuit module of the driving circuit is disposed and shielded in an independent shielded space of a shield member, so as to utilize the shield member to divide the adjacent circuit modules of the driving circuit.

In one embodiment of the present invention, in the step (C), each circuit module of the driving circuit is disposed and shielded in an independent shielded space of a shield member, so as to utilize the shield member to divide the adjacent circuit modules of the driving circuit.

According to another aspect of the present invention, it further provides a microwave detector, which comprises:

a reference ground;

a radiation source, having a feed point;

a driving circuit, electrically connected with the feed point of the radiating source, wherein the radiating source, the reference ground and the driving circuit are arranged and disposed in order along a thickness direction of the microwave detector, wherein the radiation source and the reference ground are separated and spaced so as to form and define a radiating clearance between the radiation source and the reference ground, wherein a spacing distance between the reference ground and the driving circuit is smaller than 1/128λ, wherein λ is the wavelength of the radiated wave of the microwave detector.

In one embodiment of the present invention, the microwave detector further comprises a shield member arranged to cover the driving circuit.

In one embodiment of the present invention, the shield member has at least two independent shielded spaces, wherein the driving circuit comprises at least two circuit modules, wherein the circuit modules of the driving circuit are respectively accommodated in the shielded spaces of the shield member.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

According to the disclosed contents of the specification and appended claims of the present invention, the technical solutions of the present invention are specified as follows.

Those skilled in the art should understand that, in the disclosure of the present invention, terminologies of “longitudinal,” “lateral,” “upper,” “front,” “back,” “left,” “right,” “perpendicular,” “horizontal,” “top,” “bottom,” “inner,” “outer,” and etc. just indicate relations of direction or position are based on the relations of direction or position shown in the appended drawings, which is only to facilitate descriptions of the present invention and to simplify the descriptions, rather than to indicate or imply that the referred device or element must apply specific direction or to be operated or configured in specific direction. Therefore, the above-mentioned terminologies shall not be interpreted as confine to the present invention.

It is understandable that the term “a” should be understood as “at least one” or “one or more”. In other words, in one embodiment, the number of an element can be one and in other embodiment the number of the element can be greater than one. The term “a” is not construed as a limitation of quantity.

Referring toFIGS.1-4of the present invention, a microwave detector according to a preferred embodiment of the present invention is disclosed and illustrated in the following description, wherein the microwave detector comprises a radiation source10, a reference ground20, a driving circuit30, and at least a set of suppression fence posts40.

In particular, the reference ground20has a first side21and a second side22corresponding to the first side21. The radiation source10is provided and retained on the first side21of the reference ground20. The radiation source10and the reference ground20are separated and spaced apart to form a radiating clearance50between the radiation source10and the reference ground20of the microwave detector. The driving circuit30is provided and retained on the second side22of the reference ground20. The driving circuit30is electrically connected with a feed point11of the radiation source10. The set of suppression fence posts40surrounds the driving circuit30in such a manner that the suppression fence posts40are spacingly and intervally arranged around side portions of the driving circuit30. When the driving circuit30provides microwave excitation electrical signal from the feed point11of the radiation source10to the radiation source10, the radiation source10and the reference ground20coordinate with each other to allow the microwave detector to produce radiated wave, wherein the set of suppression fence posts40can effectively suppress the stray electromagnetic radiation generated by the driving circuit30.

More specifically, for the microwave detector according to the preferred embodiment as illustrated inFIGS.1-4, the radiation source10has a radiation source surface12, the reference ground20has a reference ground surface23, and the radiation source surface12of the radiation source10and the reference ground surface23of the reference ground20are parallel with each other, so that the microwave detector has a flat panel shape. In other word, the microwave detector as illustrated inFIGS.1-4is a flat panel detector.

It is worth mentioning that the microwave detector illustrated inFIGS.1-4is described as a flat panel detector as an example, but it shall not be considered as limitation to the content and scope of the microwave detector of the present invention. For instance, according to other embodiments of the present invention, the microwave detector can be a columnar detector, which means that the extending direction of the radiation source10is perpendicular to the reference ground surface23of the reference ground20.

Referring toFIGS.1-4, the peripheral edges around the radiation source10form a rectangle shape, so as to provide the radiation source10a length direction and a width direction. The peripheral edges around the reference ground20form a rectangle shape, so as to provide the reference ground20a length direction and a width direction. In which, the length direction of the radiation source10and the length direction of the reference ground20are consistent in the same direction. Correspondingly, the width direction of the radiation source10and the width direction of the reference ground20are consistent in the same direction. According to a first alternative mode of the microwave detector as illustrated inFIG.6, the length direction of the radiation source10and the width direction of the reference ground20are consistent in the same direction, and correspondingly, the width direction of the radiation source10and the length direction of the reference ground20are consistent in the same direction.

Referring toFIGS.1-4, the microwave detector further comprises an upper plate component60and a lower plate component70. The upper plate component60comprises an upper base layer61and a first metal layer62. The upper base layer61has an attaching side611and a mounting side612corresponding to the attaching side611. The first metal layer62is attached on the attaching side611of the upper base layer61. The lower plate component70comprises a lower base layer71, a second metal layer72and a third metal layer73. The lower base layer71has an upper surface711and a lower surface712corresponding to the upper surface711. The second metal layer72is attached on the upper surface711of the lower base layer71. The third metal layer73is attached on the lower surface712of the lower base layer71.

It is worth mentioning that the first metal layer62, the second metal layer72and the third metal layer73may be, but not limited to, copper plates, such that it may utilize copper plating technology to attach the first metal layer62on the attaching side611of the upper base layer61, attach the second metal layer72on the upper surface711of the lower base layer71, and attach the third metal layer73on the lower surface712of the lower base layer71.

Referring toFIG.3B, the driving circuit30is formed by means of etching, but not limited to, on the middle portion of the third metal layer73, that is attached on the lower surface712of the lower base layer71. The etched third metal layer73forms an etched layer74which includes a peripheral portion741surrounding around the driving circuit30. In other words, the microwave detector of the present invention further comprises the etched layer74including the peripheral portion741, wherein the peripheral portion741is arranged to be surrounding around the driving circuit30so as to be layered on the lower surface712of the lower base layer71.

Preferably, the driving circuit30comprises at least two interconnected circuit modules31. Each of the circuit modules31can be, but not limited to, oscillation circuit module, frequency mixing circuit module, wave detection circuit module, amplifying circuit module, and etc. The etched layer74further includes at least a partition portion742, which is formed and provided between two adjacent circuit modules31of the driving circuit30, so as to separate and divide the two adjacent circuit modules31of the driving circuit30. For example, for the microwave detector according to the preferred embodiment of the present invention, by etching the middle portion of the third metal layer73attached on the lower surface712of the lower base layer71, the driving circuit30, the peripheral portion741surrounding around the driving circuit30, and the partition portion742dividing and separating two adjacent circuit modules31of the driving circuit30are formed and provided.

The mounting side612of the upper base layer61of the upper plate component60is attached and mounted on the second metal layer72. The driving circuit30is electrically connected with the first metal layer62, such that the first metal layer62forms the radiation source10, the second metal layer72forms the reference ground20, the upper base layer61forms the radiating clearance50, and the connecting site of the first metal layer62and the driving circuit30forms the feed point11of the radiation source10.

In the microwave detector of the present invention, after the mounting side612of the upper base layer61of the upper plate component60is attached on the second metal layer72, the driving circuit30and the first metal layer62can be communicatively connected by, for example, VIA technology and metallization through-VIA technology. Specifically, the microwave detector further comprises an electrical connection element80, formed and constructed by, for example, VIA technology and metallization through-VIA technology, which penetrates the upper plate component60and the lower plate component70and is electrically connected with the feed point11of the radiation source10and the driving circuit30, such that the feed point11of the radiation source10is electrically and conductively connected with the driving circuit30through the electrical connection element80.

In the microwave detector of the present invention, the reference ground20is formed by the second metal layer72attached on the upper surface711of the lower base layer71and the driving circuit30is formed by the third metal layer73attached on the lower surface712of the lower base layer71after etching, such that the lower base layer71divides and separates the reference ground20and the driving circuit30, so as to provide a spacing distance between the reference ground20and the driving circuit30.

According to the microwave detector as illustrated inFIGS.1-4, a thickness of the lower base layer71is equal to or larger than 1/128 λ, wherein λ is a wavelength of the radiated wave of the microwave detector, so that the spacing distance between the reference ground20and the driving circuit30is equal to or larger than 1/128 λ. A set of the suppression fence posts40surrounds the driving circuit30in such a manner that the suppression fence posts40are respectively and spacingly and intervally arranged around the side portions of the driving circuit30, so that the set of the suppression fence posts40can suppress the stray electromagnetic radiation generated by the driving circuit30effectively when the driving circuit30provides microwave excitation electrical signal from the feed point11of the radiation source10to the radiation source10to allow the radiation source10and the reference ground20to coordinate to generate radiated wave for the microwave detector.

In the microwave detector as illustrated inFIGS.1-4, the thickness of the lower base layer71is equal to the spacing distance between the reference ground20and the driving circuit30. Alternatively, the thickness of the lower base layer71is greater than the spacing distance between the reference ground20and the driving circuit30.

Preferably, each of the suppression fence posts40of the set of suppression fence posts40is extended from the peripheral portion741of the etched layer74to the direction of the reference ground20, such that the set of the suppression fence posts40surrounds the driving circuit30in such a manner that the suppression fence posts40of the set of the suppression fence posts40are spacingly and intervally arranged around the side portions of the driving circuit30, so that the set of the suppression fence posts40can prevent the electromagnetic wave generated by the driving circuit30from radiating to the outside of the peripheral portion741in order to suppressing the stray electromagnetic radiation generated by the driving circuit30. Preferably, the distance of every two adjacent suppression fence posts40of the set of suppression fence posts40is equal to or less than 1/16 λ. More preferably, the distance of two adjacent suppression fence posts40of the set of suppression fence posts40is equal to or less than 1/128 λ, so as to prevent stray electromagnetic radiation generated by the driving circuit30from radiating to the outside of the peripheral portion741and suppress the stray electromagnetic radiation generated by the driving circuit30.

According to the microwave detector of this preferred embodiment, as illustrated inFIGS.1-4, each of the suppression fence posts40of the set of suppression fence posts40is respectively from the peripheral portion741of the etched layer74to the reference ground20. For example, the set of suppression fence posts40is formed and constructed by utilizing, but not limited to, VIA technology or metallization through-VIA technology on the lower plate component70, extended from the peripheral portion741of the etched layer74to the reference ground20. According to another embodiment of the present invention, a spacing distance is provided between at least one of the suppression fence posts40of the set of suppression fence posts40and the reference ground20. Besides, the spacing distance between the suppression fence posts40and the reference ground20is smaller than or equal to 1/128λ.

Referring toFIGS.1-4, the microwave detector further comprises at least a row of suppression dams90, wherein each of the suppression dams90of the row of suppression dams is extended from the partition portion742of the etched layer74toward the direction of the reference ground20in such a manner that the suppression dams90are spacingly and intervally arranged with each other, such that the row of suppression dams90divides and separates two adjacent circuit modules31of the driving circuit30in order to reduce and weaken the electromagnetic wave produced by the driving circuit30. For example, one row of the suppression dams90can divide and separate an oscillation circuit module from a frequency mixing circuit module, one row of suppression dams90can divide and separate an oscillation circuit module from a wave detection circuit module of the driving circuit30, one row of suppression dams90can divide and separate an oscillation circuit module from an amplifying circuit module of the driving circuit30, one row of suppression dams90can divide and separate a frequency mixing circuit module from a wave detection circuit module of the driving circuit30, one row of suppression dams90can divide and separate a frequency mixing circuit module from an amplifying circuit module of the driving circuit30, and one row of suppression dams90can divide and separate a wave detection circuit module from an amplifying circuit module of the driving circuit30.

According to the microwave detector of this preferred embodiment, as illustrated inFIGS.1-4, each of the suppression dams90of the set of suppression dams90is extended from the partition portion742of the etched layer74to the reference ground20. For example, the row of suppression dams90is formed and constructed by utilizing, but not limited to, VIA technology or metallization through-VIA technology on the lower plate component70, extended from the partition portion742of the etched layer74to the reference ground20. According to another embodiment of the present invention, a spacing distance is provided between at least one of the suppression dams90of the row of suppression dams90and the reference ground20. Besides, the spacing distance between the suppression dam90and the reference ground20is smaller than or equal to 1/128λ.

Preferably, a set of the suppression fence posts40and a row of the suppression dams90can both be formed on the lower plate component70through, for example, the VIA technology or metallization through-VIA technology.

Referring toFIGS.1-4, the microwave detector further comprises a shield member100having a shielded space101therein. The shield member100is configured and arranged to cover the driving circuit30, so as to retain the driving circuit30in the shielded space101of the shield member100, such that the shield member100suppresses the stray electromagnetic radiation generated by the driving circuit30through blocking the stray electromagnetic radiation generated by the driving circuit30from radiating outside of the shield member100.

Specifically, the shield member100is arranged on the etched layer74of the lower plate component70, wherein a shield wall102of the shield member100adapted for forming and defining the shielded space101inside the shield member100is provided corresponding to the set of the suppression fence posts40. In this way, the shielded space101can be further defined by the suppression fence posts40and the reference ground20and the set of the suppression fence posts40and the shield member100can coordinate to avoid the stray electromagnetic radiation generated by the driving circuit30from radiating to the outside of the shield member100and to suppress the stray electromagnetic radiation generated by the driving circuit30.

In particular, according to one embodiment of the present invention, the shielded space101provides a wave absorption material arranged therein, which absorbs stray electromagnetic radiation in order to deplete and reduce the interference to the corresponding driving circuit30rendered by the secondary reflection of the stray electromagnetic radiation generated by the driving circuit30within the shielded space101. The wave absorption material may be, for example, but not limited to, high magnetic loss type wave absorption material, high dielectric loss type wave absorption material, and high resistive loss type wave absorption material.

FIGS.5A-5Gillustrates a manufacturing process of the microwave detector.

Referring toFIG.5Aas well as the perspective views of the microwave detector as illustrated inFIGS.1-4, the upper plate component60is provided. The upper plate component60comprises the upper base layer61and the first metal layer62attached on the attaching side611of the upper base layer61.

Specifically, in the manufacturing process of the microwave detector according to one embodiment of the present invention, firstly a base plate is provided, and then a metal plate is attached on the surface of the base plate in order to form a panel unit. Next, the panel unit is cut and shaped to form the upper plate component60. The cut and shaped base plate forms the upper base layer61of the upper plate component60and the cut and shaped metal plate forms the first metal layer62of the upper plate component60.

According to an alternative mode of the manufacturing processes of the microwave detector of the present invention, firstly the upper base layer61and the first metal layer62are provided. Then, the first metal layer62is attached on the attaching side611of the upper base layer61to form the upper plate component60.

It is worth mentioning that the way to attach the metal plate on the surface of the base plate in order to allow the metal plate and the base plate to be laminated to form a panel unit shall not be limited in the microwave detector of the present invention. For example, an adhesive such as glue is applied between the metal layer and the base plate to attach the metal plate onto the surface of the base plate, so as to allow the metal plate and the base plate to be laminated to form the panel unit.

Correspondingly, in the alternative mode, the way to attach the first metal layer62on the attaching side611of the upper base layer61shall not be limited for the microwave detector of the present invention too. For example, an adhesive is provided between the attaching side611of the upper base layer61and the first metal layer62so as to attach the first metal layer62on the attaching side611of the upper base layer61to form the upper plate component60.

Referring toFIG.5B, the lower plate component70is provided. The lower plate component70comprises the lower base layer71, the second metal layer72attached on the upper surface711of the lower base layer71, and the third metal layer73attached on the lower surface712of the lower base layer71.

Specifically, in the manufacturing process of the microwave detector according to one embodiment of the present invention, firstly a base plate is provided, and then two metal plates are attached on the two surfaces of the base plate respectively in order to form a panel unit. Next, the panel unit is cut and shaped to form the lower plate component70. The cut base plate forms the lower base layer71of the lower plate component70, while the cut metal plates respectively form the second metal layer72and the third metal layer73of the lower plate component70.

According to an alternative mode of the manufacturing processes of the microwave detector of the present invention, firstly the lower base layer71one second metal layer72and one third metal layer73are provided. Then, the second metal layer72is attached on the upper surface711of the lower base layer71and the third metal layer73is attached on the upper surface712of the lower base layer71to form the lower plate component70.

It is worth mentioning that the way to attach the metal plate on the surface of the base plate in order to allow the metal plate and the base plate to be laminated to form the panel unit shall not be limited in the microwave detector of the present invention. For example, an adhesive is applied between the metal plate and the base plate to attach the metal plate onto the surface of the base plate, so as to allow the metal layer and the base plate to be laminated to form the panel unit.

Correspondingly, in the alternative mode, the way to attach the second metal layer72on the upper surface711of the lower base layer71and the third metal layer73on the upper surface711of the lower base layer71shall not be limited for microwave detector of the present invention. For example, an adhesive is provided between the second metal layer72and the upper surface711of the lower base layer71as well as between the third metal layer73and the lower surface712of the lower base layer71, so as to attach the second metal layer72on the upper surface711of the lower base layer71and attach the third metal layer73on the lower surface712of the lower base layer71.

Referring toFIGS.5C and5D, etch a middle portion of the second metal layer72to form a notch721in the second metal layer72. And, etch the third metal layer73so as to form and construct the driving circuit30thereon, a peripheral portion741of the etched layer74surrounding around the driving circuit30, and a partition portion742of the etched layer74dividing and separating the adjacent circuit module31of the driving circuit30.

It is worth mentioning that the order of etching the second metal layer72and etching the third metal layer73shall not be limited in the manufacturing process of the microwave detector of the present invention. For example, according to one embodiment, the second metal layer72is firstly etched and then the third metal layer73is etched. Nevertheless, according to another embodiment, the third metal layer73is firstly etched and then the second metal layer72is etched. Moreover, according to another embodiment, the second metal layer72and the third metal layer73are etched at the same time.

Referring toFIG.5E, by means of such as VIA technology or metallization through-VIA technology, at least a set of suppression fence posts40and at least a row of suppression dams90are formed on the lower plate component70, wherein the suppression fence posts40of the set of suppression fence posts40are spacingly and intervally formed and constructed around the side portions of the driving circuit30in the manner of extending from the peripheral portion741of the etched layer74towards the direction of the second metal layer72, so that the suppression fence posts40of the set of suppression fence posts40surround around the driving circuit30. In addition, the suppression dams90of the row of suppression dams90are spacingly and intervally formed and constructed between the adjacent circuit modules31of the driving circuit30in the manner of extending from the partition portion742of the etched layer74towards the direction of the second metal layer72, so that the suppression dams90of the row of suppression dams90divide and separate the adjacent circuit modules31of the driving circuit30. Preferably, each of the suppression fence posts40of the set of suppression fence posts40is extended from the peripheral portion741of the etched layer74to the second metal layer72, wherein each of the suppression dams of the row of suppression dams90is extended from the partition portion742of the etched layer74to the second metal layer72.

It is worth mentioning that the order of forming and constructing the suppression fence posts40and the suppression dams90shall not be limited in the manufacturing process of the microwave detector of the present invention. For example, according to a preferred embodiment, the suppression fence posts40are firstly formed and constructed and then the suppression dams90are formed and constructed. Nevertheless, according to an alternative mode, the suppression dams90are firstly formed and constructed and then the suppression fence posts40are formed and constructed. Also, according another alternative mode, the suppression fence posts40and the suppression dams90are formed and constructed at the same time.

Referring toFIG.5F, attach and mount the mounting side612of the upper base layer61of the upper plate component60on the second metal layer72of the lower plate component70, and then the electrical connection element80, extended from the first metal layer62of the upper plate component60via the through notch721of the second metal layer72of the lower plate component70to the driving circuit30, is formed and constructed by, for example, VIA technology and metallization through-VIA technology, such that the first metal layer62of the upper plate component60forms the radiation source10, the second metal layer72of the lower plate component70forms the reference ground20, and the upper base layer61of the upper plate component60forms the radiating clearance50. It should be understandable that, through the formation of the through notch721in the second metal layer72of the lower plate component70, the electrical connection element80formed can be prevented from communicating with the reference ground20.

Referring toFIG.5G, the shield member100is mounted on the lower plate component70, such that the shield wall102of the shield member100is arranged corresponding to the set of suppression fence posts40, so as to keep and retain the driving circuit30in the shielded space101formed and defined by the shield wall102of the shield member100.

It is worth mentioning that the way of mounting the shield member100on the lower plate component70shall not be limited for the microwave detector of the present invention. For example, the lower plate component70may have one or more mounting holes75extended from the peripheral portion741of the etched layer74to the reference ground20, and the shield member100may comprise one or more mounting arms104arranged thereon, such that the one or more mounting arms104of the shield member100can be respectively mounted in the mounting holes75of the lower plate component70, so as to install the shield member100to the lower plate component70.

In accordance with another aspect of the invention, the present invention further provides a manufacturing method of the microwave detector, comprising the following steps:

(a) Etch the second metal layer72that is attached on the upper surface712of the lower base layer71, so as to allow the second metal layer72to form the notch721, and etch the third metal layer73that is attached on the lower surface712of the lower base layer72to allow the third metal layer73to form the driving circuit30.

(b) Form at least a set of the suppression fence posts40surrounding around the side portions of the driving circuit30.

(c) Allow the mounting side612of the upper base layer61, which has the first metal layer62attached on the attaching side611thereof, to be attached on the second metal layer72.

(d) Form the electrical connection element80, extended from the first metal layer62to the driving circuit30via the through notch721of the second metal layer72, so as to make the microwave detector, wherein the first metal layer62forms the radiation source10of the microwave detector, the second metal layer72forms the reference ground20of the microwave detector, and the upper base layer61forms the radiating clearance50of the microwave detector.

In contrasting to the microwave detector as illustrated inFIGS.1-4, the microwave detector according to a second alternative mode as illustrated inFIGS.7-9is different in that the microwave detector comprises two sets of suppression fence posts40, wherein both sets of suppression fence posts40are arranged surrounding the driving circuit30, wherein one of the sets of suppression fence posts40is arranged in in inner position forming a set of inner suppression fence posts41, while correspondingly, the other set of suppression fence posts40is arranged in the outer position forming a set of outer suppression fence posts42, wherein the inner suppression fence posts41surround the driving circuit30in such a manner that the inner suppression fence posts41are spacingly and intervally arranged along the side portions of the driving circuit30, and the outer suppression fence posts42surround the driving circuit30in such a manner that the outer suppression fence posts42are spacingly and intervally arranged along the side portions of the driving circuit30. Preferably, each of the inner suppression fence posts41of the set of inner suppression fence posts41and each of the outer suppression fence posts42of the set of outer suppression fence posts42are alternately arranged and positioned. For example, any one of the inner suppression fence posts41is formed corresponding to the space formed and defined between two adjacent outer suppression fence posts42, while any one of the outer suppression fence posts42is also formed corresponding to the space formed and defined between the two adjacent inner suppression fence posts41. Alternatively, the inner suppression fence posts41and the outer suppression fence posts42are positioned corresponding with each other.

Referring toFIGS.7-9, according to the second alternative mode of the above preferred embodiment of the present invention, the driving circuit30is embodied to comprise three circuit modules31, namely a frequency mixing wave detection circuit module, an oscillation circuit module and a low frequency amplifying circuit module. Correspondingly, the microwave detector comprises two rows of suppression dams, including one row of first suppression dams91and another row of second suppression dams92. The row of first suppression dams91is extended from an end of the peripheral portion741to the other end thereof in such a manner that the first suppression dams91are separated and spaced with one another, such that the low frequency amplifying circuit module is retained in one side of the row of first suppression dams91, while the frequency mixing wave detection circuit module and the oscillation circuit module are retained at the other side of the row of first suppression dams91, wherein the row of second suppression dams92is extended from a side of the peripheral portion741to the first suppression dams91in such a manner that the second suppression dams92are separated and spaced from one another, such that the frequency mixing wave detection circuit module is retained in one side of the row of second suppression dams92, while the oscillation circuit module is retained in the other side of the row of second suppression dams92. In other words, the row of first suppression dams91is arranged for dividing and separating adjacent circuit modules31of the driving circuit30, and that the row of second suppression dams92is arranged for dividing and separating adjacent circuit modules31of the driving circuit30too.

Preferably, referring toFIGS.8and9, each of the first suppression dams91of the row of first suppression dams91and each of the second suppression dams92of the row of second suppression dams92are extended from the lower base layer71to the reference ground20.

Please referring toFIGS.7-9, according to the second alternative mode of the above preferred embodiment of the present invention, the shield member100is embodied to comprise the shield wall102and two division members103, namely a first division member1031and a second division member1032. The space formed and defined in the shield wall102by the first division member1031is extended from an end of the shield wall102to another end thereof. The space formed and defined in the shield wall102by the second division member1032is extended from a side of the shield wall102to the first division member1031, so as to utilize the shield wall102, the first division member1031and the second division member1032to form and define three adjacent and independent shielded spaces101.

The shield member100is mounted on the lower plate component70. The shield wall102of the shield member100is arranged corresponding to the set of suppression fence posts40. The first division member1031of the shield member100is arranged corresponding to one row of the first suppression dams91. The second division member1032of the shield member100is arranged corresponding to one row of the second suppression dams92. Thereby, the low frequency amplifying circuit module of the driving circuit30is positioned corresponding to the shielded space101formed and defined by the shield wall102and the first division member1031; the frequency mixing wave detection circuit module of the driving circuit30is positioned corresponding to the shielded space101formed and defined by the shield wall102, the first division member1031and the second division member1032; the oscillation circuit module of the driving circuit30is positioned corresponding to the shielded space101formed and defined by the shield wall102, the first division member1031and the second division member1032, such that the shield member100can divide and isolate the adjacent circuit modules31of the driving circuit30so as to suppress the stray electromagnetic radiation generated by the driving circuit30as well as to reduce the interference to the adjacent circuit modules31rendered by the stray electromagnetic radiation generated by the driving circuit30.

Preferably, the shield member100has an integral structure. That is the shield wall102, the first division member1031and the second division member1032of the shield member100can be integrally formed.

In contrasting to the microwave detector as illustrated inFIGS.7-9, the microwave detector according to a third alternative mode as illustrated inFIGS.10-11is different in that the driving circuit30is embodied to comprise two circuit modules31, namely an oscillation circuit module and a frequency mixing wave detection amplifying circuit module, wherein one row of the first suppression dams91is extended from an end of the peripheral portion741towards the direction of another end thereof, while one row of the second suppression dams92is extended from a side of the peripheral portion741towards the direction of another side thereof, wherein the row of first suppression dams91is arranged with respect to the row of second suppression dams92, such that the row of first suppression dams91and the row of second suppression dams92are arranged to divide and isolate the oscillation circuit module and the frequency mixing wave detection amplifying circuit module of the driving circuit30.

The space formed and defined within the shield wall102by the first division member1031of the shield member100is extended from an end of the shield wall102towards the direction of another end of the shield wall102. The space formed and defined within the shield wall102by the second division member1032is extended from a side of the shield wall102towards the direction of another side of the shield wall102. Besides, the first division member1031and the second division member1032are connected with each other, so as to utilize the shield wall102, the first division member1031and the second division member1032to form and define two adjacent and independent shielded spaces101.

The shield member100is mounted on the lower plate component70. The shield wall102of the shield member100is arranged corresponding to one set of the suppression fence posts40. The first division member1031of the shield member100is arranged corresponding to one row of the first suppression dams91. The second division member1032of the shield member100is formed corresponding to one row of the second suppression dams92. Thereby, the oscillation circuit module of the driving circuit30is retained in the corresponding shielded space101formed and defined by the shield wall102, the first division member1031and the second division member1032, and the frequency mixing wave detection amplifying circuit module of the driving circuit30is retained in the corresponding shielded space101formed and defined by the shield wall102, the first division member1031and the second division member1032. Accordingly, the shield member100substantially divides and isolates the adjacent circuit modules31of the driving circuit30, so as to suppress the stray electromagnetic radiation generated by the driving circuit30as well as to reduce the interference to adjacent circuit modules31rendered by the stray electromagnetic radiation generated by the driving circuit30.

In particular, according to some embodiments of the present invention, at least one of the shielded spaces101comprises a wave absorption material arranged therein, which absorbs stray electromagnetic radiation in order to deplete and reduce the interference to the corresponding driving circuit30and/or adjacent circuit module(s)31by the secondary reflection of the stray electromagnetic radiation generated by the driving circuit30in the shielded space101. The wave absorption material may be, for example but not limited to, high magnetic loss type wave absorption material, high dielectric loss type wave absorption material, and high resistive loss type wave absorption material.

In contrasting to the microwave detector as illustrated inFIGS.1-4, the microwave detector according to a fourth alternative mode of the above preferred embodiment of the present invention as illustrated inFIGS.12-13is different in that the upper base layer61of the upper plate component60is layered on the second metal layer72of the lower plate component70, so as to prevent the reference ground20formed by the second metal layer72of the lower plate component70from exposure. In other words, for the microwave detector as illustrated inFIGS.12-13, the suppression fence posts40are invisible from the exterior and outside.

The manufacturing process of the microwave detector according to the fourth alternative mode of the above preferred embodiment of the present invention as illustrated inFIGS.12-13is different from the manufacturing process of the microwave detector as illustrated inFIGS.1-4in that a base plate is firstly provided, and then a metal layer is attached on the surface of the base plate in order to form a panel unit. Next, the panel unit is cut, and then the metal layer is etched in order to form the upper plate component60. The cut base plate forms the upper base layer61of the upper plate component60and the cut and etched metal layer forms the first metal layer62of the upper plate component60.

In accordance with another aspect of the invention, the present invention further provides a stray electromagnetic radiation suppression method for microwave detector, comprising the following steps:

(A) Arrange at least one set of suppression fence posts40around the driving circuit30of the microwave detector along the side portions of the driving circuit30.

(B) Prevent the electromagnetic wave produced by the driving circuit30from radiating to the direction of the side portions of the driving circuit30by means of the at least one set of the suppression fence posts40when a microwave excitation electrical signal is provided from the feed point11of the radiation source10of the microwave detector to the radiation source10by the driving circuit30, so as to suppress the stray electromagnetic radiation generated by the driving circuit30.

Further, the stray electromagnetic radiation suppression method further comprises the following step:

(C) Divide and isolate the adjacent circuit modules31of the driving circuit30so as to weaken the stray electromagnetic radiation generated by the driving circuit30.

Specifically, according to a preferred embodiment of the present invention, in the step (C) of the stray electromagnetic radiation suppression method, at least a row of the suppression dams90is formed between the adjacent circuit modules31of the driving circuit30, such that the row of suppression dams90divides and isolates the adjacent circuit modules31of the driving circuit30in order to suppress the stray electromagnetic radiation generated by the driving circuit30and to reduce the interference to the adjacent circuit module31rendered by the stray electromagnetic radiation generated by the driving circuit30.

According to another preferred embodiment of the present invention, in the step (C) of the stray electromagnetic radiation suppression method, the circuit modules31of the driving circuit30are respectively retained in independent shielded spaces101of the shield member100, so as to utilize the shield member100to divide and isolate the adjacent circuit modules31of the driving circuit30in order to suppress the stray electromagnetic radiation generated by the driving circuit30and to reduce the interference to the adjacent circuit module31rendered by the stray electromagnetic radiation generated by the driving circuit30.

Referring toFIGS.14-17of the present invention, a microwave detector according to a fifth alternative mode of the above preferred embodiment of the present invention is disclosed and illustrated in the following description, wherein the microwave detector comprises a radiation source10A, a reference ground20A and a driving circuit30A.

More specifically, the reference ground20A has a first side21A and a second side22A with respect to the first side21A. The radiation source10A is retained on the first side21A of the reference ground20A. The radiation source10A and the reference ground20A are separated and spaced to form a radiating gap50A of the microwave detector between the radiation source10A and the reference ground20A. The driving circuit30A is retained on the second side22A of the reference ground20A. The driving circuit30A is electrically connected with a feed point11A of the radiation source10A. A spacing distance between the reference ground20A and the driving circuit30A is smaller than 1/128λ, wherein λ is the wavelength of the radiated wave of the microwave detector. When the driving circuit30A provides microwave excitation electrical signal from the feed point11A of the radiation source10A to the radiation source10A, the radiation source10A and the reference ground20A coordinate with each other to allow the microwave detector to produce radiated wave. Accordingly, the configuring and arranging of the spacing distance between reference ground20A and the driving circuit30A to be smaller than 1/128λ can suppress the stray electromagnetic radiation generated by the driving circuit30A.

More specifically, for the microwave detector according to the fifth alternative mode of the above preferred embodiment of the present invention as illustrated inFIGS.14-17, the radiation source10A comprises a radiation source plane12A, wherein the reference ground20A has a reference ground plane23A, and the radiation source plane12A of the radiation source10A and the reference ground plane23A of the reference ground20A are parallel to each other, so as to make the microwave detector having a flat panel shape. In other words, the microwave detector as illustrated inFIGS.14-17is a flat panel detector.

It is worth mentioning that the microwave detector as illustrated inFIGS.14-17is described as a flat panel detector as an example, but it shall not be considered as limitation of the content and scope of the microwave detector of the present invention. For example, according to other embodiments of the present invention, the microwave detector can be a columnar detector, which means that the extending direction of the radiation source10A is perpendicular to the reference ground plane23A of the reference ground20A.

Referring toFIGS.14-17, the radiation source10A has a rectangle shape with four edges therearound, such that the radiation source10A has a length direction and a width direction. The reference ground20A also has a rectangle shape with four edges therearound, such that the reference ground20A has a length direction and a width direction. The length direction of the radiation source10A and the length direction of the reference ground20A are parallel. Correspondingly, the width direction of the radiation source10A and the width direction of the reference ground20A are parallel. Alternatively, according to an alternative mode of the microwave detector, the length direction of the radiation source10A and the width direction of the reference ground20A are configured in parallel direction, and correspondingly, the width direction of the radiation source10A and the length direction of the reference ground20A are configured in parallel direction.

Referring toFIGS.14-17, the microwave detector further comprises an upper plate component60A and a lower plate component70A. The upper plate component60A comprises an upper base layer61A and a first metal layer62A. The upper base layer61A has an attaching side611A and a mounting side612A corresponding to the attaching side611A. The first metal layer62A is attached on the attaching side611A of the upper base layer61A. The lower plate component70A comprises a lower base layer71A, a second metal layer72A and a third metal layer73A. The lower base layer71A has an upper surface711A and a lower surface712A corresponding to the upper surface711A. The second metal layer72A is attached on the upper surface711A of the lower base layer71A. The third metal layer73A is attached on the lower surface712A of the lower base layer71A.

It is worth mentioning that the first metal layer62A, the second metal layer72A and the third metal layer73A may be, but not limited to, copper layers, such that it may utilize copper plating technology to attach the first metal layer62A on the attaching side611A of the upper base layer61A, attach the second metal layer72A on the upper surface711A of the lower base layer71A, and attach the third metal layer73A on the lower surface712A of the lower base layer71A.

Referring toFIG.16, the driving circuit30A is formed by means of, but not limited to, etching on a middle portion of the third metal layer73A that is attached on the lower surface712A of the lower base layer71A. The etched third metal layer73A forms an etched layer74A and the etched layer74A includes a peripheral portion741A surrounding around the driving circuit30A.

The mounting side612A of the upper base layer61A of the upper plate component60A is attached and mounted on the second metal layer72A. The driving circuit30A is electrically connected with the first metal layer62A, such that the first metal layer62A forms the radiation source10A, the second metal layer72A forms the reference ground20A, the upper base layer61A forms the radiating clearance50A, and the connecting site of the first metal layer62A and the driving circuit30A forms the feed point11A of the radiation source10A.

In the microwave detector of the present invention, after the mounting side612A of the upper base layer61A of the upper plate component60A is attached on the second metal layer72A, the driving circuit30A and the first metal layer62A are electrically and conductively connected through, for example, VIA technology or metallization VIA technology. Specifically, the microwave detector further comprises an electrical connection element80A, formed and constructed through, for example, VIA technology or metallization VIA technology, so as to penetrate the upper plate component60A and the lower plate component70A and be electrically connected with the feed point11A of the radiation source10A and the driving circuit30A, such that the feed point11A of the radiation source10A and the driving circuit30A are electrically and conductively connected by the electrical connection element80A.

In the microwave detector of the present invention, the reference ground20A is formed by the second metal layer72A attached on the upper surface711A of the lower base layer71A and the driving circuit30A is formed by the third metal layer73A attached on the lower surface712A of the lower base layer71A after etching, such that the lower base layer71A divides and isolates the reference ground20A and the driving circuit30A, so as to maintain a spacing distance between the reference ground20A and the driving circuit30A.

In the microwave detector as illustrated in Figs and14-17, the thickness of the lower base layer71A is smaller than 1/128λ, wherein λ is the wavelength of the radiated wave produced by the microwave detector, such that the spacing distance between the reference ground20A and the driving circuit30A is smaller than 1/128λ. Therefore, when the driving circuit30A provides microwave excitation electrical signal from the feed point11A of the radiation source10A to the radiation source10A, the radiation source10A and the reference ground20A coordinate with each other to allow the microwave detector to produce radiated wave. Accordingly, the configuring and arranging of the spacing distance between reference ground20A and the driving circuit30A to be smaller than 1/128λ can suppress stray electromagnetic radiation produced by the driving circuit30A.

Referring toFIGS.14-17, the microwave detector further comprises a shield member100A having a shielded space101A therein. The shield member100A is configured and arranged to cover the driving circuit30A so as to retain the driving circuit30A within the shielded space101A of the shield member100A in order to suppress the stray electromagnetic radiation generated by the driving circuit30and block the stray electromagnetic radiation generated by the driving circuit30A from radiating to the outside of the shield member100A.

The differences between the microwave detector according to a sixth alternative mode of the above preferred embodiment of the present invention as illustrated inFIG.18and the microwave detector according to the fifth alternative mode of the above preferred embodiment of the present invention as illustrated inFIGS.14-17include that, for the microwave detector as illustrated inFIG.18, the shield member100A comprises at least two independent shielded spaces101A formed therein and the driving circuit30A comprises at least two circuit modules31A, wherein the at least two shielded space101A of the shield member100A respectively accommodate the at least two circuit modules31A of the driving circuit30A, so as to divide and isolate the adjacent circuit modules of the driving circuit by the shield member100A, so as to suppress the stray electromagnetic radiation generated by the driving circuit.

One skilled in the art should be able to understand that the above embodiments are just examples. Therefore, features of various embodiments may also be interchanged and combined in order to easily come out and achieve other implementations that the drawings of the present invention have not specified based on the disclosed contents of the present invention.

One skilled in the art will understand that the embodiment of the present invention as shown in the drawings and described above is exemplary only and not intended to be limiting. It will thus be seen that the objects of the present invention have been fully and effectively accomplished. The embodiments have been shown and described for the purposes of illustrating the functional and structural principles of the present invention and is subject to change without departure from such principles. Therefore, this invention includes all modifications encompassed within the spirit and scope of the following claims.