Antenna structure

A antenna structure including a reflector, a horizontally polarized antenna and a vertically polarized antenna on the front side of reflector, wherein the horizontally polarized antenna is made up of a pair of dipoles, each said dipole includes a positive ground member and a negative ground member overlapping each other, while the vertically polarized antenna is made of a upper ground member and a lower ground member overlapping each other, and the upper ground member is above the upper dipole and the lower ground member is below the lower dipole, and a first signal source and a second signal source extend from the back side of the reflector to the front side to excite the horizontally polarized antenna and the vertically polarized antenna, respectively.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates generally to an antenna structure, and more specifically, to an antenna structure with integrated horizontally polarized antenna and vertically polarized antenna.

2. Description of the Related Art

As mobile communication technologies develop, an electronic device, which is equipped with an antenna module, such as a smartphone, a wearable device, or the like is widely supplied. The electronic device may receive or transmit a signal including data (e.g., a message, a photo, a video, a music file, a game, and the like) through the antenna.

The antenna module of the electronic device is implemented using a plurality of antenna elements for the purpose of receiving or transmitting a signal more efficiently. For example, the electronic device may include one or more antenna arrays in each of which a plurality of antenna elements are arranged in a regular shape. A signal that is received by an electronic device may be polarized in a specific direction. To receive or transmit a vertically polarized signal or a horizontally polarized signal, the electronic device may physically separate the plurality of paths based on a direction in which a signal is polarized.

Next-generation wireless communication technologies, like 5G mobile networks or wireless system, may use a millimeter wave (mmWave) which is substantially greater than or equal to 20 GHz. In order to overcome a high free space loss due to a frequency characteristic and to increase an antenna gain, specific horizontally polarized antennas and specific vertically polarized antennas are required to receive and transmit vertically polarized signal or horizontally polarized signal respectively. In addition, to ensure a 360° coverage at the time of mm-wave communication, the antenna device is preferably mounted on an edge portion of the electronic device, such as a corner portion of the circuit board. However, while the electronic device is gradually becoming slimmer, the thin thickness as compared to the longitudinal size thereof may not provide a sufficient length or is not easy to be implemented for vertically polarized antennas as well as to design a required frequency, and at least some regions of the antenna modules and circuit module may overlap or be placed too closer each other. When a plurality of antenna modules are installed along the periphery of a board, a polarization loss due to the interference between adjacent antenna modules is expected. Thus, when the antenna modules are mounted, it is necessary for the antenna modules to be spaced apart from each other by a predetermined spacing which unavoidably causes the integration of the antenna modules to be degraded.

Accordingly, there is a need for an improved antenna structure with well-integrated horizontally and vertically polarized antennas arrangement to provide dual polarized transmission in confined space and prevent the interference between adjacent antenna modules.

SUMMARY OF THE INVENTION

In order to meet the requirement of next-generation wireless communication, the present invention hereby provides an antenna structure with well-integrated horizontally polarized antenna module and vertically polarized antenna module to provide optimized radiation performance of the antenna module in dual polarization manner without mutual interference and make the best use of confined space in compact electronic devices.

The aspect of present invention is to provide an antenna structure, including a reflector dividing said antenna structure into a front side and a back side, a horizontally polarized antenna on said front side of said reflector, wherein said horizontally polarized antenna comprises a pair of dipoles at least partially overlapping each other, and each said dipole comprises a positive ground member and a negative ground member separated by a slot, a first signal source extending from a back side of said reflector to said front side through a first opening of said reflector, wherein said first signal source extends between said dipoles and extends from one overlapping interval between said positive ground members of said dipoles to another overlapping interval between said negative ground members of said dipoles across said slot to excite said horizontally polarized antenna, a vertically polarized antenna on said front side of said reflector, wherein said vertically polarized antenna comprises a upper ground member and a lower ground member at least partially overlapping each other, wherein said upper ground member is above upper said dipole and said lower ground member is below lower said dipole, and a second signal source extending from said back side of said reflector to said front side through a second opening of said reflector, wherein said second signal source extends between said upper ground member and said lower ground member and extends vertically toward one of said upper ground member and said second lower ground member to excite said vertically polarized antenna.

It should be noted that all the figures are diagrammatic. Relative dimensions and proportions of parts of the drawings have been shown exaggerated or reduced in size, for the sake of clarity and convenience in the drawings. The same reference signs are generally used to refer to corresponding or similar features in modified and different embodiments.

DETAILED DESCRIPTION

In following detailed description of the present invention, reference is made to the accompanying drawings which form a part hereof and is shown by way of illustration and specific embodiments in which the invention may be practiced. These embodiments are described in sufficient details to enable those skilled in the art to practice the invention. Dimensions and proportions of certain parts of the drawings may have been shown exaggerated or reduced in size, for the sake of clarity and convenience in the drawings. Other embodiments may be utilized and structural, logical, and electrical changes may be made without departing from the scope of the present invention. The following detailed description, therefore, is not to be taken in a limiting sense, and the scope of the present invention is defined by the appended claims.

As used in various embodiments of the present disclosure, the expressions “include”, “may include” and other conjugates refer to the existence of a corresponding disclosed function, operation, or constituent element, and do not limit one or more additional functions, operations, or constituent elements. Further, as used in various embodiments of the present disclosure, the terms “include”, “have”, and their conjugates are intended merely to denote a certain feature, numeral, step, operation, element, component, or a combination thereof, and should not be construed to initially exclude the existence of or a possibility of addition of one or more other features, numerals, steps, operations, elements, components, or combinations thereof.

Spatially relative terms, such as “beneath,” “below,” “lower,” “above,” “upper,” and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It should be readily understood that these meanings such as “on,” “above,” and “over” in the present disclosure should be interpreted in the broadest manner such that “on” not only means “directly on” something but also includes the meaning of “on” something with an intermediate feature or a layer therebetween, and that “above” or “over” not only means the meaning of “above” or “over” something but can also include the meaning it is “above” or “over” something with no intermediate feature or layer therebetween (i.e., directly on something).

While expressions including ordinal numbers, such as “first” and “second”, as used in various embodiments of the present disclosure may modify various constituent elements, such constituent elements are not limited by the above expressions. For example, the above expressions do not limit the sequence and/or importance of the elements. The above expressions are used merely for the purpose of distinguishing an element from the other elements. For example, a first user device and a second user device indicate different user devices although both of them are user devices. For example, a first element may be termed a second element, and likewise a second element may also be termed a first element without departing from the scope of various embodiments of the present disclosure.

It should be noted that if it is described that an element is “coupled” or “connected” to another element, the first element may be directly coupled or connected to the second element, and a third element may be “coupled” or “connected” between the first and second elements. Conversely, when one component element is “directly coupled” or “directly connected” to another component element, it may be construed that a third component element does not exist between the first component element and the second component element.

An electronic device according to various embodiments of the present disclosure may be a device having a function that is provided through various colors emitted depending on the states of the electronic device or a function of sensing a gesture or bio-signal. For example, the electronic device may include at least one of a smart phone, a tablet personal computer (PC), a mobile phone, a video phone, an e-book reader, a desktop PC, a laptop PC, a netbook computer, a personal digital assistant (PDA), a portable multimedia player (PMP), an MP3 player, a mobile medical device, a camera, a wearable device (e.g., a head-mounted-device (HMD) such as electronic glasses, electronic clothes, an electronic bracelet, an electronic necklace, an electronic appcessory, an electronic tattoo, or a smart watch).

Hereinafter, a concept of an antenna structure according to various embodiments of the present disclosure may be described with reference toFIGS. 1-12, whereinFIGS. 1-3schematically illustrate a horizontally polarized antenna portion in the antenna structure,FIGS. 4-6schematically illustrate a vertically polarized antenna portion in the antenna structure, andFIGS. 7-9schematically illustrate entire antenna structure with the integrated horizontally polarized antenna portion and vertically polarized antenna portion.

Please refer toFIGS. 1-3, the horizontally polarized antenna structure100in perspective view, top view and cross-sectional view are provided respectively according to the preferred embodiment of the present disclosure. The antenna structure100of present disclosure may be formed in a substrate101through ordinary photolithography processes, PCB (Printed Circuit Board) manufacturing process or LTCC (low-temperature co-fired ceramic) manufacturing process. The substrate101may be provided to support, fix and protect the members of antenna structure100, with low loss tangent and proper dielectric constants to fulfill the requirement of antenna miniaturization and achieve desired wavelength and speed of propagation of a wave through the medium of substrate101. The substrate101may be a flexible printed circuit board or a dielectric board, made of electrically insulating materials including but not limited to FR4, PPO (polyphenylene oxide), BT (Bismaleimide Triazine), CEM (Composite Epoxy Material) resin, glass fiber, ceramic and PTFE (Polytetrafluoroethene). The integrated antenna of the present invention may be implemented in either a non-multilayer form or a multilayer form. For example, every component may be first fabricated and then be combined or moulded on or within a supporting structure (ex. phone case).

Refer still toFIGS. 1-3. A wall-type reflector103is formed in the substrate101. The reflector103serves to reflect electromagnetic waves radiating by the radiator, increasing gain in a given direction. The reflector103in the embodiment of present invention is made up of multiple stacked metal layers105connected by first vias107. The stacked metal layers105may be common copper films, laminated alternatively with insulating layers in a form of copper-clad laminate (CCL). The pattern of each metal layer105and via holes between the metal layers105may be formed and defined individually by photolithography, drilling or screen printing. With via holes penetrating vertically through every metal layer105and filled with conductive material like copper, multiple first vias107is formed regularly and densely connecting and cooperating with every stacked metal layer105to create a wall structure for reflecting wave radiated by the radiator. In some embodiment, the reflector103may include more than one aforementioned wall structures, with first vias107arranged and connected alternatively therebetween. In some embodiment, the reflector103may be in a shape of flat, curved or irregular wall extending vertically without vias.

In the embodiment, the substrate101is divided by the reflector103into a front portion101afor antenna modules and a back portion101bfor circuit modules. The radiator of the antenna module is formed from the stacked metal layers105. Regarding the front portion101a, the horizontally polarized antenna structure100in the preferred embodiment of present invention is a dipole antenna in stripline-type transmission to obtain better frequency band. The radiator is made up of a pair of dipoles, including an upper dipole113and a lower dipole115at least partially overlapping each other and spaced apart vertically by a predetermined spacing, allowing signal sources to extend therethrough and excite the radiator. Moreover, each dipole113,115may further include a positive ground member109and a negative ground member110separated horizontally by and laterally symmetric with respect to a slot111in the middle of reflector103.

As shown inFIG. 3, the positive ground member109and the negative ground member110may be parts (ex. the horizontally-extending portions) of the stacked metal layers105extending horizontally from the reflector103, with their patterns defined concurrently with the reflector103by photolithography or screen printing. Preferably, the dipoles113,115are set at a horizontal level half height of the reflector103to ensure effective energy reflection by the reflector103. In the embodiment, the pattern of dipoles109is not limited to the one shown inFIG. 2. The positive ground member109and the negative ground member110are provided respectively with opposite extending structures in horizontally extending direction, to create a characteristic of 170-degree and 190-degree phase differences in the propagating/horizontal direction of electromagnetic wave from the first signal source117, to generate energy radiation propagating in positive and negative Y-axis direction for horizontal polarization. The positive ground member109and the negative ground member110may be planes or in polygon shape. Preferably, when the positive ground member109and the negative ground member110are in horizontal symmetry, a 180-degree phase difference may be created to achieve best antenna characteristics. The pair of dipoles113,115in vertically overlapping configuration may reduce the mutual and negative impact between horizontally polarized antenna and vertically polarized antenna, thus the two different antennas may be three-dimensionally integrated in the same space or position within the substrate101.

Refer still toFIGS. 1-3. In addition to the dipoles113and115, a first signal source117for horizontal polarization is provided in the antenna module. The first signal source117extends from the back portion101bof the substrate101to the front portion101athrough a first opening103aon the reflector103, as shown inFIG. 2. More specifically, the path of first signal source117starts from one of the positive ground member109and the negative ground member110, extends completely along the pattern between the upper dipole113and the lower dipole115and reaches the edge of the ground member109or110adjacent to the slot111. The first signal source117would extend across the slot111, preferably parallel between the pair of dipoles113and115, and end up at the other ground member between the upper dipole113and the lower dipole115. The energy emitted from the first signal source117would couple the dipole, i.e. the radiator, when crossing the slot111and is transmitted to the upper and lower dipoles113,115thereof to generate resonance and radiation effect. Accordingly, the energy of electromagnetic wave is propagated in horizontally polarizing direction. As shown inFIG. 3, in the embodiment of present invention, the first signal source117may be apart of the metal layer105extending horizontally from the reflector103, with its pattern defined concurrently with the reflector103by photolithography.

Refer still toFIGS. 1-3. Regarding the back portion101b, a first shielding space119is formed by encircling multiple stacked metal layers105and first vias107. In the embodiment, the first signal source117has a vertical portion119aextending vertically from the bottom in the shielding space119. The vertical portion119aof the first signal source117and the encircling stacked metal layers105may establish a kind of coaxial cable transmission with better shielding and noise immune characteristics. One end of the vertical portion119aextends horizontally to the front portion101aof the substrate101through the first opening103a, while the other end of the vertical portion119amay electrically connect to the circuit module of the antenna, such as a radio frequency integrated circuit (RFIC) on the back portion101bor a printed circuit board of an electronic communication device. The vertical portion119aof first signal source117may be made up of multiple stacked vias formed in the same process as the first vias107.

The embodiment described above is the concept of horizontally polarized antenna in the antenna structure of present invention. Now, please refer toFIGS. 4-6, which schematically illustrate the concept of vertically polarized antenna structure120in perspective view, top view and cross-sectional view respectively according to the preferred embodiment of the present disclosure.

Similar to the horizontal polarized antenna structure100, the vertically polarized antenna structure120of present disclosure may be formed in the same substrate101as the horizontal polarized antenna structure101through ordinary semiconductor processes. The same wall-type, multilayer stacked reflector103is formed in the substrate101to reflect electromagnetic waves radiating by signal sources, increasing gain in a given direction. The radiator of the vertically polarized antenna module is also formed from the metal layers105, however, with different shape and arrangement from the horizontal polarized ones.

Refer still toFIGS. 4-6, the vertically polarized antenna structure120in the preferred embodiment of present invention is a magnetoelectric (ME) antenna, different from the dipole antenna shown in previous embodiment. The radiator is made up of a rectangular upper ground member121and a lower ground member123partially or completely overlapping each other with same shape. The upper ground member121and the lower ground member123are spaced apart vertically by a predetermined spacing, allowing signal sources to extend therethrough and excite the radiator.

As shown inFIG. 6, the upper ground member121and the lower ground member123, i.e. the radiator, may be parts of the stacked metal layers105extending horizontally from the reflector103, with their patterns defined concurrently with the reflector103by photolithography. The spacing between the upper ground member121and the lower ground member123should be larger enough to provide sufficient vertically-extending space for the signal source used to achieve vertical polarization. Preferably, the upper ground member121and the lower ground member123are set as the top metal and bottom metal respectively in the stacked metal layer105, and a second signal source125extends vertically toward one of the upper ground member121and the lower ground member123to excite the vertically polarized antenna.

In the embodiment, the pattern of the upper ground member121and the lower ground member123is not limited to the rectangular shown as shown inFIG. 5. Any proper pattern conforming to the characteristic of 0-degree and 180-degree phase, 170˜190-degree phase differences or 180-degree phase differences to the propagating direction of electromagnetic wave is adoptable, as long as they are in up-down symmetry and energy radiation can be propagated in positive and negative Z-axis direction in extremely slim spacing between the upper and lower ground members121,123for vertical polarization.

Refer still toFIGS. 4-6. The second signal source125for vertical polarization is provided in the antenna module. The second signal source125extends from the back portion101bof the substrate101to the front portion101athrough a second opening103bon the reflector103, as shown inFIG. 5. More specifically, the path of second signal source125starts in the middle of and extends preferably perpendicularly to nearly opposite edge of the ground plane. The whole second signal source125should completely extend between the upper ground member121and lower ground member123and should not out of range thereof. The energy emitted from the second signal source125would couple the radiator and is transmitted to the upper and lower ground member121,123thereof to generate resonance and radiation effect. Accordingly, the energy of electromagnetic wave is propagated in vertically polarizing direction. In the embodiment of present invention, as shown inFIG. 6, the second signal source125may be a part of the metal layer105extending horizontally from the reflector103, with its pattern defined concurrently with the reflector103by photolithography, and the shape of second signal source125may be variant to increase impedance matching.

Refer still toFIGS. 4-6. Regarding the back portion101b, similarly, a second shielding space127is formed by encircling multiple stacked metal layers105and first vias107. In the embodiment, the second signal source125has vertical portions125aextending vertically from the bottom in the second shielding space127and in the spacing between the upper and lower ground member121,123. The vertical portion125aof the second signal source125and the encircling stacked metal layers105may establish a kind of coaxial cable transmission with better shielding and noise immune characteristics. One end of the vertical portion125aextends horizontally to the front portion101athrough the second opening103b, while the other end of the vertical portion125amay electrically connect to the circuit module of the antenna, such as a radio frequency integrated circuit (RFIC) on the back portion101bor a printed circuit board of an electronic communication device. Similarly, the vertical portion125aof second signal source125may be made up of multiple stacked vias formed in the same process as the first vias107.

In addition to the upper and lower ground member121,123and the second signal source125, an auxiliary ground plane129may be placed between the second upper ground plane121and the second lower ground plane123and in a position right under the second signal source125(or right above the signal source if the signal source extends downwardly). The area of auxiliary ground plane129is preferably slightly larger than the portion of the second signal source125in the front portion101ato adjust the impedance matching.

In some embodiment, please refer toFIG. 6, the antenna structure may further include terminals (or connectors, not shown) and circuit module disposed in the back portion101b. The grounding pad and the feeding pad130of each antenna may be electrically connected to a circuit module132, for example, a phase shifter IC. The circuit module may further electrically connected to terminals to connect with the communication unit of an external communication device to implement wireless communication. In the application of antenna array, the phase shifter IC may function to adjust the field pattern and direction of entire antenna to achieve better communication efficiency.

The embodiment described above is the concept of vertically polarized antenna in the antenna structure of present invention. Now, please refer toFIGS. 7-9, which schematically illustrate the concept of the multilayer stacked antenna structure130with integrated horizontally polarized antenna module and vertically polarized antenna module in perspective view, top view and cross-sectional view respectively according to the preferred embodiment of the present disclosure. The main purpose of present invention is to provide a multilayer stacked antenna structure with well-integrated horizontally polarized antenna module and vertically polarized antenna module, in order to provide optimized radiation performance of the antenna module in dual polarization manner without mutual interference and make the best use of confined space in compact electronic devices. This antenna structure130combines the structures of aforementioned horizontally polarized antenna structure100and vertically polarized antenna structure120into a volume of substrate101same as the embodiments of horizontally polarized antenna module and vertically polarized antenna module, so that the antenna density in unit volume is effectively double.

Refer toFIGS. 7-9. The antenna structure130with integrated horizontally polarized antenna module and vertically polarized antenna module is provided with all of the components describe in the embodiment ofFIGS. 1-3andFIGS. 4-6, including the wall-type reflector103, the pair of dipoles made up of the positive ground member109and the negative ground member110, the upper and lower member121and123, the first signal source117and the second signal source125. Specifically, as shown inFIG. 9, since the second signal source for vertically polarized antenna requires sufficient vertically extending space, the upper dipole113and the lower dipole115of horizontally polarized antenna module are preferably set between the upper and lower ground members121and123. More specifically, the pair of dipoles113and115is set at a horizontal level half height of the reflector103to ensure effective energy reflection by the reflector103, while the upper and lower ground members121,123are set as the top metal and bottom metal respectively of the stacked metal layer105to provide sufficient extending space.

Refer still toFIGS. 7-9. Since the first signal source117for the horizontally polarized antenna needs to extend across the slot111between the positive ground members109and the negative ground members110of the dipoles113and115, the dipoles of horizontally polarized antenna would preferably extend farther than the upper and lower ground member121,123of vertically polarized antenna from the reflector103to provide a proper path across the slot111without interfering with the second signal source125for vertically polarized antenna. Optionally, multiple second vias131are provided in connection with the upper and lower dipoles113and115along edges adjacent to the slot111, and the second signal source125is disposed in the slot111between two rows of these second vias131respectively at the positive ground members109and the negative ground members110of the pair of dipoles113and115. The first signal source117would across the slot111at a position farther than the row of second vias131from the reflector130. The row of second vias131between the first signal source117and the second signal source125may function like a shielding to prevent the interference between vertically polarized source and horizontally polarized source and obtain better degree of isolation. Similarly, the first signal source117and the second signal source125extend respectively from the first shielding space119and the second shielding space127at back portion101bthrough the first opening103aand the second opening103b.

Next, refer toFIG. 10, which schematically illustrates a perspective view of the multilayer stacked antenna structure with integrated horizontally polarized antenna module and vertically polarized antenna module in accordance with another embodiment of the present invention. Some components may be added into the antenna structure to further improve the propagation of radiating wave. As shown inFIG. 10, the antenna structure130may be provided with two rows of third vias133respectively at the positive ground members109and the negative ground members110of the pair of dipoles113and115. Specifically, the third vias133in the embodiment are disposed between the positive ground member (plane)109and the negative ground member (plane)110of the upper dipole113and the upper ground member121and between the positive ground member (plane)109and the negative ground member (plane)110of the lower dipole115and the lower ground member123, and a spacing S between the two rows of third vias133is gradually increased from the second opening103bto the other end of radiators to create a horn-shaped via arrangement. This kind of horn structure standing between the ground planes may amplify the propagation of radiating wave in specific direction, while in this case, in X-axis direction against the reflector103. The third via133is preferably not disposed between the upper dipole113and the lower dipole115in case of blocking the path of first signal source117. Similarly, the third vias133may be made up of multiple stacked vias formed in the same process as the first vias107.

Next, please refer toFIG. 11, which schematically illustrates a perspective view of the multilayer stacked antenna structure with integrated horizontally polarized antenna module and vertically polarized antenna module in accordance with another embodiment of the present invention. A row of vertically-extending column directors135may be provided between the positive ground members (planes)109and the negative ground members (planes)110of the pair of dipoles and selectively aligned with the second signal source125. Theses column directors135may improve the gain of vertically polarized antenna module. Similarly, the column directors135may be made up of multiple stacked vias formed in the same process as the first vias107.

Next, please refer toFIG. 12, which schematically illustrates a perspective view of an antenna array with multiple arranged antenna structures130in accordance with still another embodiment of the present invention. The antenna structures130with integrated horizontally polarized antenna and vertically polarized antenna may be arranged in a phased array manner to implement the beam forming, multi-input multi-output (MIMO) and millimeter wave (mmWave) technologies for 5G mobile networks or wireless system. Fourth vias137provided between each antenna structures130may function as a shielding to prevent mutual interference and improve the degree of isolation between the antenna structures130. Similarly, the fourth vias137may be made up of multiple stacked vias formed in the same process as the aforementioned via structure.

Please refer toFIG. 13, which schematically illustrates a graph of a reflection coefficient (i.e. return loss) and isolation in a circuit of two-port network according to a frequency of the antenna structure130in accordance with the embodiment of the present invention. The solid line10represents the reflection coefficient dB(S(1,1)) of port 1 when matching with port 2. The dash line20represents the reflection coefficient dB(S(2,2)) of port 2 when matching with port 1. The chain line30represents the forward transmission coefficient dB(S(2,1)) from port 1 to port 2 when matching with port 2. It is indicated in the figure that the reflection coefficients dB(S(1,1)) and dB(S(2,2)) are both less than −10 dB at the target frequency about 26.5-29.5 GHz. As such, it may be verified that the performances of the integrated horizontally polarized and vertically polarized antenna structure130is sufficient to radiate a signal at target frequency. In addition, it is indicated in the figure that the forward transmission coefficient dB(S(2,1)) is less than −25 dB at the target frequency. As such, it may be verified that the horizontally polarized antenna structure100and the vertically polarized antenna structure120are electrically and sufficiently isolated from each other.

Please refer toFIG. 14, which schematically illustrates a graph of a reflection coefficient (i.e. return loss) and isolation according to a frequency of 1×4 antenna array shown inFIG. 14in accordance with the embodiment of the present invention. In the figure, the dB(S(H1,H1)) to dB(S(H4,H4)) represent the reflection coefficient of horizontally polarized antenna in four antenna structures130, while dB(S(V1,V1)) to dB(S(V4,V4)) represent the reflection coefficient of vertically polarized antenna in four antenna structures130. It is indicated in the figure that the eight reflection coefficients about the horizontally and vertically polarized antenna are all less than −10 dB at the target frequency about 26.5-29.5 GHz. As such, it may be verified that the performances of integrated horizontally polarized and vertically polarized antenna structure130is sufficient to radiate a signal at target frequency.

According to the structures and graph data described in the aforementioned embodiments. The multilayer stacked antenna structure provided by the present invention efficiently integrates the horizontally polarized antenna module and the vertically polarized antenna module in confined space. The return loss and transmission coefficients indicate the integrated antenna structure has optimized radiation performance, even in array arrangement, to meet the requirement of next-generation wireless communication technologies