Patent Description:
With the development of wireless communication technology, the demand for home communication products is increasing. As the core component of signal transmission and reception, antennas are widely used in home communication products. The microstrip antenna has the advantages of miniaturization, easy integration, and good directivity, so it has broad application prospects.

The general microstrip antenna is on a thin dielectric substrate, one side is attached with a thin metal layer as a grounding plate, and the other side is made into a metal patch of a certain shape by a photolithography method, which is a planar antenna with microstrip line or coaxial probe fed to the patch. The microstrip antenna has a planar structure and is easy to integrate with other circuits. However, the application of the microstrip antenna in the field of smart TVs currently mainly suffers from the problem of radiation direction, which makes the smart TV have low forward gain and small bandwidth range. <NPL> and <CIT> are related prior art references for this field.

The main object of this application is to provide a microstrip antenna, which aims to provide a microstrip antenna that is miniaturized, has higher gain, and can increase bandwidth.

To achieve the above object, this application provides a microstrip antenna, including:.

In an embodiment of this application, the substrate defines a metalized via, the grounding layer defines a hollow hole corresponding to the metalized via, and the excitation layer is electrically connected to the power feeder through the metalized via and the hollow hole.

In an embodiment of this application, the metalized via is provided with solidified metal.

In an embodiment of this application, the power feeder includes an inner conductor, a feeding point corresponding to the metalized via is provided in the hollow hole, and the excitation layer is electrically connected to the inner conductor through the metalized via and the feeding point.

In an embodiment of this application, the microstrip antenna is fed via a coaxial line, and the power feeder further includes an outer conductor and an insulator filling between the inner conductor and the outer conductor.

In an embodiment of this application, the substrate defines a metal through hole spaced apart from the metalized via, the dielectric layer defines a via corresponding to the metal through hole, the excitation layer is electrically connected to the grounding layer through the metal through hole, and the coupling layer is electrically connected to the grounding layer through the metal through hole and the via.

In an embodiment of this application, multiple metal through holes and multiple vias are defined, the multiple metal through holes are arranged at even intervals along an edge of the substrate, and the multiple vias are arranged at even intervals along an edge of the dielectric layer.

In an embodiment of this application, the metal through hole and the via are both circular holes.

In an embodiment of this application, a diameter of the metal through hole and a diameter of the via are both <NUM>.

In an embodiment of this application, a distance between a center of the metal through hole and a boundary of the substrate and a distance between the center of the metal through hole and a boundary of the dielectric layer are both <NUM>;
and/or, a distance between a center of the via and the boundary of the substrate and a distance between the center of the via and the boundary of the dielectric layer are both <NUM>.

In an embodiment of this application, the substrate is a double-layer circuit board.

In an embodiment of this application, a thickness of the substrate is <NUM>, and a thickness of the dielectric layer is <NUM>.

In an embodiment of this application, the substrate and the dielectric layer are made of epoxy resin.

In an embodiment of this application, a resonant frequency range of the microstrip antenna is <NUM> to <NUM>;
and/or, a standing wave ratio of the microstrip antenna is less than <NUM>.

In an embodiment of this application, a length of the microstrip antenna is <NUM> and a width of the microstrip antenna is <NUM>.

In an embodiment of this application, the length of the grounding layer and the length of the coupling layer are both <NUM>, and the width of the grounding layer and the width of the coupling layer are both <NUM>.

In an embodiment of this application, the width of the excitation layer is <NUM> smaller than the width of the grounding layer and the width of the excitation layer is <NUM> smaller than the width of the coupling layer.

In addition, this application further provides a television mounted with a microstrip antenna, where the microstrip antenna is defined according to the above-mentioned embodiments.

In the technical solution provided in this application, three metal layers of a grounding layer, an excitation layer, and a coupling layer are provided, and the coupling layer and the excitation layer are both electrically connected to the grounding layer to realize a short circuit design, which reduces the antenna size, and has simple manufacturing process and low cost. And horizontal omnidirectional radiation may be realized, so as to improve the radiation pattern, and facilitate improving the forward gain of the TV The excitation layer is electrically connected to the power feeder, and the signal is fed into the microstrip antenna therefrom. The back feed method is adopted to reduce the feeding layer and reduce the cost. A coupling layer is added on the basis of the excitation layer, so that double resonance is realized through the excitation layer and the coupling layer, and the bandwidth is increased.

In order to more clearly describe the technical solutions in the embodiments of this application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of this application. For those of ordinary skill in the art, without creative work, other drawings can be obtained according to the structures shown in these drawings.

The realization of the purpose, functional characteristics, and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

The technical solutions in the embodiments of this application will be described clearly and completely in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, but not all the embodiments.

It should be noted that all directional indicators (such as up, down, left, right, front, back. ) in the embodiments of this application are only used to explain the relative positional relationship, movement conditions, etc. among the components in a specific posture (as shown in the drawings), if the specific posture changes, the directional indicator also changes accordingly.

In this application, unless otherwise clearly specified and limited, the terms "connected", "fixed", etc. should be understood in a broad sense. For example, "fixed" can be a fixed connection, a detachable connection, or a whole; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication between two components or the interaction relationship between two components, unless specifically defined otherwise. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in this application can be understood according to specific circumstances.

In addition, the descriptions related to "first", "second", etc. in this application are for descriptive purposes only, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first" and "second" may include at least one of the features either explicitly or implicitly. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of those skilled in the art to realize. When the combination of technical solutions conflicts with each other or cannot be realized, it should be considered that the combination of such technical solutions does not exist , nor within the scope of protection required by this application.

This application provides a microstrip antenna <NUM>.

Referring to <FIG>, according to an embodiment of this application, the microstrip antenna <NUM> includes a substrate <NUM>, and the substrate <NUM> includes a mounting surface <NUM> and a grounding surface <NUM> disposed oppositely. The microstrip antenna <NUM> further includes an excitation layer <NUM>, a grounding layer <NUM>, a power feeder <NUM> and a coupling structure <NUM>. The excitation layer <NUM> is provided on the mounting surface <NUM> of the substrate <NUM>. The grounding layer <NUM> is provided on the grounding surface <NUM> of the substrate <NUM>. The power feeder <NUM> is provided on a side of the grounding layer <NUM> facing away from the substrate <NUM>, and the power feeder <NUM> is penetrated through the substrate <NUM> to be electrically connected to the excitation layer <NUM>. The coupling structure <NUM> is provided on a side of the excitation layer <NUM> facing away from the mounting surface <NUM> of the substrate <NUM>, and the coupling structure <NUM> includes a coupling layer <NUM> and a dielectric layer <NUM>. The dielectric layer <NUM> is located between the excitation layer <NUM> and the coupling layer <NUM>, and the coupling layer <NUM> and the excitation layer <NUM> are electrically connected to the grounding layer <NUM>.

Specifically, the substrate <NUM> is a double-layer PCB (Printed Circuit Board), and the double-layer circuit board not only facilitates impedance matching of the microstrip antenna <NUM>, but also facilitates the design of the feeding structure. In addition, the material selection of the substrate <NUM> will affect the performance of the microstrip antenna <NUM>, for example, the gain and volume of the microstrip antenna <NUM>, and the thickness of the substrate <NUM> will also affect the volume and weight of the microstrip antenna <NUM>. In this embodiment, the substrate <NUM> and the dielectric layer <NUM> may be FR4 epoxy resin, which not only has low cost, but also ensures that good antenna operating characteristics are maintained at different operating frequencies. Optionally, the thickness of the substrate <NUM> is <NUM>, and the thickness of the dielectric layer is <NUM>.

In the technical solution provided in this application, three metal layers of a grounding layer <NUM>, an excitation layer <NUM>, and a coupling layer <NUM> are provided, and the coupling layer <NUM> and the excitation layer <NUM> are both electrically connected to the grounding layer <NUM> to realize a short circuit design, which reduces the antenna size, and has simple manufacturing process and low cost. And horizontal omnidirectional radiation may be realized, so as to improve the radiation pattern, and facilitate improving the forward gain of the TV The excitation layer <NUM> is electrically connected to the power feeder <NUM>, and the signal is fed into the microstrip antenna <NUM> therefrom. The back feed method is adopted to reduce the feeding layer and reduce the cost. A coupling layer <NUM> is added on the basis of the excitation layer <NUM>, so that double resonance is realized through the excitation layer <NUM> and the coupling layer <NUM>, and the bandwidth is increased.

Optionally, the shape of the microstrip antenna <NUM> may affect impedance matching, directivity function, etc., thereby affecting the radiation efficiency of the microstrip antenna <NUM>. In this embodiment, the microstrip antenna <NUM> has a rectangular shape. In addition, the length and width of the microstrip antenna <NUM> will directly affect the volume of the antenna. In this embodiment, the length of the microstrip antenna <NUM> is <NUM> and the width of the microstrip antenna <NUM> is <NUM>, which is small in size, saves space, and is convenient for assembling the TV.

Referring to <FIG> and <FIG>, the substrate <NUM> defines a metalized via <NUM>, the grounding layer <NUM> defines a hollow hole <NUM> corresponding to the metalized via <NUM>, and the excitation layer <NUM> is electrically connected to the power feeder <NUM> through the metalized via <NUM> and the hollow hole <NUM>.

The metalized via refers to a via with solidified metal inside, so that the via is electrically conductive. A hole may be drilled on the substrate <NUM>, and then liquid metal (such as copper) may be injected into the hole and solidified to form a metalized via. In this embodiment, the excitation layer is electrically connected to the power feeder <NUM> through the metalized via <NUM> and the hollow hole <NUM> to realize signal transmission.

Please continue to refer to <FIG>, the power feeder <NUM> includes an inner conductor <NUM>. A feeding point <NUM> corresponding to the metalized via <NUM> is provided in the hollow hole <NUM>, and the excitation layer <NUM> is electrically connected to the inner conductor <NUM> through the metalized via <NUM> and the feeding point <NUM>.

Power feed of the antenna is to feed the antenna frequency signal. In this embodiment, a coaxial line power feed is adopted. The inner conductor <NUM>, the outer conductor (not shown), and the insulator (not shown) filled between the inner conductor <NUM> and the outer conductor are generally coaxial. In this embodiment, the power feeder <NUM> is electrically connected to the excitation layer <NUM> through the feeding point <NUM> and the metalized via <NUM> to realize signal transmission.

Referring to <FIG> and <FIG>, the substrate <NUM> defines a metal through hole <NUM> spaced apart from the metalized via <NUM>. The dielectric layer <NUM> defines a via <NUM> corresponding to the metal through hole <NUM>. The excitation layer <NUM> is electrically connected to the grounding layer <NUM> through the metal through hole <NUM>. The coupling layer <NUM> is electrically connected to the grounding layer <NUM> through the metal through hole <NUM> and the via <NUM>.

In this embodiment, the excitation layer <NUM> is short-circuited with the grounding layer <NUM> through the metal through hole <NUM>, and the coupling layer <NUM> is short-circuited with the grounding layer <NUM> through the metal through hole <NUM> and the via <NUM>. The short-circuit structure realizes the gap radiation, which not only reduces the size of the antenna by about half, more importantly, improves the radiation pattern, which is conducive to the improvement of the TV forward gain.

Please continue to refer to <FIG> and <FIG>, multiple metal through holes <NUM> and multiple vias <NUM> are defined. The multiple metal through holes <NUM> are arranged at even intervals along an edge of the substrate <NUM>, and the multiple vias <NUM> are arranged at even intervals along an edge of the dielectric layer <NUM>.

The number of metalized vias for grounding will affect the radiation efficiency of the microstrip antenna <NUM>. Generally speaking, the greater the number of metalized vias for grounding, the higher the radiation efficiency of the microstrip antenna <NUM>. In this embodiment, the metal through holes <NUM> and the vias <NUM> are evenly spaced, and a reasonable density of the metalized vias is used as a short circuit to realize a miniaturized design of the antenna, and all radio frequency energy is radiated from the gap to improve the radiation efficiency.

Specifically, the number of the metal through holes <NUM> and the number of the via holes <NUM> are both <NUM>. Both the metal through holes <NUM> and the via holes <NUM> are circular, which is convenient for processing. The diameters of both are <NUM>, and a distance between a center of the circle and a boundary of the substrate and a boundary of the dielectric layer <NUM> is <NUM>.

Optionally, the lengths of the grounding layer <NUM> and the coupling layer <NUM> are the same, and the widths of the grounding layer <NUM> and the coupling layer <NUM> are the same, and the width of the excitation layer <NUM> is smaller than the width of the grounding layer <NUM> and the coupling layer <NUM>.

The size of the grounding layer <NUM>, the coupling layer <NUM> and the excitation layer <NUM> will affect the volume of the entire microstrip antenna <NUM>. In this embodiment, the lengths of the grounding layer <NUM> and the coupling layer <NUM> are the same, and the widths of the grounding layer <NUM> and the coupling layer <NUM> are the same, and the width of the excitation layer <NUM> is smaller than the width of the grounding layer <NUM> and the coupling layer <NUM>. This arrangement facilitates signal coupling and realizes dual resonance, thereby expanding the bandwidth of the microstrip antenna <NUM>. Specifically, the lengths of the grounding layer <NUM> and the coupling layer <NUM> are both <NUM>, and the widths of the grounding layer <NUM> and the coupling layer <NUM> are both <NUM>, and the width of the excitation layer <NUM> is <NUM> smaller than the width of the grounding layer <NUM> and the coupling layer <NUM>.

Referring to <FIG>, <FIG>, in this embodiment, the resonant frequency of the microstrip antenna <NUM> covers the frequency range of <NUM>-<NUM>, and the standing wave ratio (VSWR) is less than <NUM>, and the spatial omnidirectional radiation is achieved. In addition, because the microstrip antenna <NUM> is prominent in vertical polarization, it can be applied to scenarios that require high vertical polarization, such as wifi and Bluetooth.

Claim 1:
A microstrip antenna (<NUM>), comprising
a substrate (<NUM>), comprising a mounting surface (<NUM>) and a grounding surface (<NUM>) arranged oppositely;
an excitation layer (<NUM>), provided on the mounting surface (<NUM>) of the substrate (<NUM>);
a grounding layer (<NUM>), provided on the grounding surface (<NUM>) of the substrate (<NUM>);
a power feeder (<NUM>), provided on a side of the grounding layer (<NUM>) facing away from the substrate (<NUM>), and penetrated through the substrate (<NUM>) to be electrically connected to the excitation layer (<NUM>); and
a coupling structure (<NUM>), provided on a side of the excitation layer (<NUM>) facing away from the mounting surface (<NUM>) of the substrate (<NUM>), and comprising a coupling layer (<NUM>) and a dielectric layer (<NUM>), the dielectric layer (<NUM>) being located between the excitation layer (<NUM>) and the coupling layer (<NUM>), the coupling layer (<NUM>) and the excitation layer (<NUM>) being electrically connected to the grounding layer (<NUM>);
wherein the microstrip antenna (<NUM>) has a rectangular shape;
wherein a length of the grounding layer (<NUM>) and a length of the coupling layer (<NUM>) are the same, and a width of the grounding layer (<NUM>) and a width of the coupling layer (<NUM>) are the same; and
wherein a width of the excitation layer (<NUM>) is smaller than the width of the grounding layer (<NUM>), and the width of the excitation layer (<NUM>) is smaller than the width of the coupling layer (<NUM>).