CN108134196B

CN108134196B - Microstrip antenna and television

Info

Publication number: CN108134196B
Application number: CN201711427520.0A
Authority: CN
Inventors: 尹柳中; 谢仁礼; 王子同
Original assignee: Shenzhen TCL New Technology Co Ltd
Current assignee: Shenzhen TCL New Technology Co Ltd
Priority date: 2017-12-25
Filing date: 2017-12-25
Publication date: 2020-12-08
Anticipated expiration: 2037-12-25
Also published as: CN108134196A; WO2019128181A1

Abstract

The invention discloses a microstrip antenna and a television, wherein the microstrip antenna comprises a substrate, the substrate comprises a first surface and a second surface arranged opposite to the first surface, the microstrip antenna also comprises a feed part, a grounding layer and an antenna part, and the feed part is arranged on the first surface of the substrate; the grounding layer is arranged on the second surface of the substrate; the antenna part is arranged on the first surface of the substrate and is rectangular, two rectangular grooves parallel to the short edge are formed in one long edge of the antenna part, the long edge of the antenna part, provided with the rectangular grooves, is electrically connected with the grounding layer through a plurality of metal through holes, the antenna part comprises a connecting section located between the two rectangular grooves, and the connecting section is electrically connected with the feeding part. The microstrip antenna has higher gain.

Description

Microstrip antenna and television

Technical Field

The invention relates to the technical field of antennas, in particular to a microstrip antenna and a television.

Background

The general microstrip antenna is a planar antenna formed by applying a metal foil on the back of a dielectric substrate as a ground plane and making a metal patch (microstrip antenna) with a certain shape on the front by using a photoetching technology, wherein the planar antenna is usually rectangular or circular and is formed by feeding the patch by a coaxial line or a microstrip line, and the planar antenna is also called a microstrip antenna. The working principle of the microstrip antenna is that the metal patch is equivalent to an inductance-capacitance resonant circuit, electromagnetic resonance is generated on the metal patch through electromagnetic waves fed coaxially, and finally electromagnetic wave energy is radiated out or received.

The microstrip antenna has the characteristics of thin section, small volume, light weight, low cost, easy batch production and easy conformation with shells of various objects such as airplanes, satellites and even warheads. Microstrip antennas are planar structures that are easily integrated with other circuits. However, the microstrip antenna is not yet applied to the smart television at present, and the main reason is that the existing microstrip antenna causes the forward gain of the smart television to be lower.

Disclosure of Invention

The invention mainly aims to provide a microstrip antenna, aiming at solving the technical problem of lower forward gain of the existing television.

In order to achieve the above object, the microstrip antenna provided by the present invention includes a substrate, the substrate includes a first surface and a second surface opposite to the first surface, the microstrip antenna further includes:

a feeding portion arranged on the first surface of the substrate;

the grounding layer is arranged on the second surface of the substrate;

the antenna part is arranged on the first surface of the substrate and is rectangular, two rectangular grooves parallel to the short edge are formed in one long edge of the antenna part, the long edge of the antenna part, provided with the rectangular grooves, is electrically connected with the grounding layer through a plurality of metal through holes, the antenna part comprises a connecting section positioned between the two rectangular grooves, and the connecting section is electrically connected with the feeding part.

Preferably, the two rectangular slots are symmetrically distributed on two sides of a connecting line of the midpoints of the long sides of the antenna part.

Preferably, the width of the antenna part is W, and the depth of the rectangular groove is H, wherein 2/3W is less than or equal to H and less than or equal to W.

Preferably, the aperture of the metal through hole ranges from 0.1mm to 0.3 mm.

Preferably, the ground layer is disposed in an "i" shape, the ground layer includes a first ground segment, a second ground segment, and a third ground segment connecting the first ground segment and the second ground segment, a projection of the antenna portion on the second surface of the substrate is in the first ground segment, and a projection of the feeding portion on the second surface of the substrate is in the third ground segment.

Preferably, the ground plane further includes two fourth ground sections located at two sides of the third ground section, both the two fourth ground sections are connected to the third ground section, the third ground section is provided with a first jack, and the substrate is provided with a second jack corresponding to the first jack.

Preferably, the substrate is an FR4 epoxy board, and the thickness of the substrate is 1.6 mm.

The invention further provides a television, the television is provided with a microstrip antenna, the microstrip antenna comprises a substrate, the substrate comprises a first surface and a second surface arranged opposite to the first surface, the microstrip antenna is a magnetic current source antenna, and the microstrip antenna further comprises:

a feeding portion arranged on the first surface of the substrate;

the grounding layer is arranged on the second surface of the substrate;

According to the microstrip antenna, the antenna part is arranged on the first surface of the substrate and is rectangular, two rectangular grooves parallel to the short edge are formed in one long edge of the antenna part, the long edge of the antenna part, provided with the rectangular grooves, is electrically connected with the grounding layer through the metal through holes, the antenna part comprises a connecting section located between the two rectangular grooves, and the connecting section is electrically connected with the feeding part. Therefore, the metal through hole connects the long edge of the antenna part provided with the rectangular groove with the ground layer in a short circuit mode, and the other long edge of the antenna part opposite to the long edge provided with the rectangular groove serves as a radiation part and is used for receiving and transmitting electromagnetic wave signals, so that the gain of the microstrip antenna can be improved. The microstrip antenna has simple manufacturing process and lower cost, and can improve the forward gain of the television, thereby ensuring that the voice of the television is smoother and the problem of picture blockage is avoided.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic front view of a microstrip antenna according to the present invention;

FIG. 2 is a schematic diagram of an opposite structure of the microstrip antenna shown in FIG. 1;

FIG. 3 is a dimensional diagram of the microstrip antenna of FIG. 1;

FIG. 4 is a graph of S-parameters of the microstrip antenna of FIG. 1;

FIG. 5 is a three-dimensional gain pattern of the microstrip antenna of FIG. 1;

FIG. 6 is a cross-sectional view of a three-dimensional gain pattern of the microstrip antenna of FIG. 5;

fig. 7 is a schematic view of the assembly of the microstrip antenna and the reflection plate of the television set according to the present invention.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				100	Microstrip antenna	40	Grounding layer
10	Substrate	41	First ground segment
				11	First surface	42	Second ground segment
12	Second surface	43	Third ground segment
				20	Feeding unit	44	Fourth ground segment
30	Antenna unit	45	First jack
				31	Rectangular groove	46	Second jack
32	Metal through hole	200	Mounting plate
				33	Connecting segment

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship, motion, etc. of the components in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the various embodiments can be combined with each other, but must be based on the realization of the technical solutions by those skilled in the art, and when the technical solutions are contradictory or can not be realized, the combination of the technical solutions should be considered to be absent and not be within the protection scope of the present invention.

The present invention provides a microstrip antenna 100.

Referring to fig. 1 to 2, a microstrip antenna 100 according to the present invention includes a substrate 10, where the substrate 10 includes a first surface 11 and a second surface 12 opposite to the first surface 11, the microstrip antenna 100 further includes a feeding portion 20, a ground layer 40, and an antenna portion 30, and the feeding portion 20 is disposed on the first surface 11 of the substrate 10; the ground layer 40 is disposed on the second surface 12 of the substrate 10. The antenna portion 30 is disposed on the first surface 11 of the substrate 10, the antenna portion 30 is rectangular, two rectangular slots 31 parallel to the short edge are disposed on one long edge of the antenna portion 30, the long edge of the antenna portion 30 on which the rectangular slots 31 are disposed is electrically connected to the ground layer 40 through a plurality of metal through holes 32, the antenna portion 30 includes a connection section 33 located between the two rectangular slots 31, and the connection section 33 is electrically connected to the feeding portion 20.

Specifically, the substrate 10 is a double-sided PCB (Printed Circuit Board). The material of the substrate 10 may affect the performance of the microstrip antenna 100, such as the gain and volume of the microstrip antenna 100, and the thickness of the substrate 10 may also affect the volume and weight of the microstrip antenna 100. In the present embodiment, in order to reduce the cost, the substrate 10 is preferably an FR4 epoxy board, and the thickness thereof may be 0.8mm to 2.0 mm. Preferably, the thickness of the substrate 10 is 1.6 mm.

The length and width of the antenna portion 30 affect the impedance matching and the directivity function of the microstrip antenna 100, thereby affecting the radiation efficiency of the microstrip antenna 100, and the length and width of the antenna portion 30 also directly affect the volume of the microstrip antenna 100. In the present embodiment, the antenna unit 30 is rectangular, and has a length of 1/2 medium wavelengths and a width of 1/4 medium wavelengths. The long side of the antenna portion 30, on which the rectangular slot 31 is formed, is electrically connected to the ground layer 40 through a plurality of metal through holes 32, the antenna portion 30 includes a connection section 33 located between the two rectangular slots 31, the connection section 33 is electrically connected to the feeding portion 20, the metal through holes 32 short-circuit the long side of the antenna portion 30, on which the rectangular slot 31 is formed, to the ground layer 40, and the other long side of the antenna portion 30, opposite to the long side on which the rectangular slot 31 is formed, serves as a radiation portion for receiving and transmitting electromagnetic wave signals, so that the gain of the microstrip antenna 100 can be improved.

The two rectangular grooves 31 have the same shape, and the depth of each rectangular groove 31 is smaller than the width of the antenna portion 30. The distribution positions of the two rectangular grooves 31 are not particularly limited. It should be noted that the connecting section 33 is located between the two rectangular grooves 31, and thus, the position distribution of the connecting section 33 is closely related to the position distribution of the two rectangular grooves 31. For example, when the two rectangular slots 31 are symmetrically distributed on both sides of the connection line of the middle points of the long sides of the antenna portion 30, the connection segment 33 is located at the middle position of the long side of the antenna portion 30; when the two rectangular slots 31 are distributed on one side of the midpoint connecting line of the long sides of the antenna portion 30, the connecting segment 33 is located at one end of the long side of the antenna portion 30, but this may affect the non-circularity of the pattern of the microstrip antenna 100. In a preferred embodiment, in order to reduce the out-of-roundness of the microstrip antenna 100, two rectangular slots 31 are symmetrically distributed on two sides of a connection line between the midpoints of the long sides of the antenna portion 30.

The feeding portion 20 is rectangular, and the width of the connecting segment 33 may be greater than the width of the feeding portion 20, may also be equal to the width of the feeding portion 20, and may also be smaller than the width of the feeding portion 20, which is not limited herein. Preferably, the width of the connection segment 33 is larger than the width of the feeding portion 20, so as to facilitate impedance matching.

According to the microstrip antenna 100 of the present invention, the antenna portion 30 is disposed on the first surface 11 of the substrate 10, the antenna portion 30 is disposed in a rectangular shape, two rectangular slots 31 parallel to the short edge are disposed on one long edge of the antenna portion 30, the long edge of the antenna portion 30, on which the rectangular slots 31 are disposed, is electrically connected to the ground layer 40 through the plurality of metal through holes 32, the antenna portion 30 includes a connection segment 33 located between the two rectangular slots 31, and the connection segment 33 is electrically connected to the feeding portion 20. Thus, the metal through hole 32 connects the long side of the antenna portion 30 with the ground layer 40, and the other long side of the antenna portion 30 opposite to the long side with the rectangular slot 31 serves as a radiation portion for transmitting and receiving electromagnetic wave signals, so that the gain of the microstrip antenna 100 can be improved. The microstrip antenna 100 of the invention has simple manufacturing process and lower cost, and can improve the forward gain of the television, thereby ensuring that the voice of the television is smoother and the problem of unsmooth picture is not generated.

In a preferred embodiment, the width of the antenna portion 30 is W, and the depth of the rectangular slot 31 is H, wherein 2/3W is less than or equal to H and less than or equal to W. The depth and width of the rectangular slot 31 affect the length and width of the antenna portion 30, and thus affect the volume, gain, and radiation efficiency of the microstrip antenna 100. Wherein the rectangular groove 31 has a groove width smaller than the width of the connecting section 33.

Further, the lower end of the connecting section 33 is tapered, so that the distance between the connecting section 33 and the metal via 32 can be increased, which is beneficial to improving the radiation efficiency of the microstrip antenna 100.

The number of vias 32 also affects the radiation efficiency of the microstrip antenna 100, and generally, the greater the number of vias 32, the higher the radiation efficiency of the microstrip antenna 100. The shape of the metal through hole 32 may be various, for example, it may be a circular hole for forming convenience, or a square hole. In the present embodiment, the via hole 32 is a circular hole, the aperture of the via hole 32 ranges from 0.1mm to 0.3mm, and preferably, the aperture of the via hole 32 is 0.2 mm.

In this embodiment, the ground layer 40 is disposed in an "i" shape, the ground layer 40 includes a first ground segment 41, a second ground segment 42, and a third ground segment 43 connecting the first ground segment 41 and the second ground segment 42, a projection of the antenna portion 30 on the second surface 12 of the substrate 10 is in the first ground segment 41, and a projection of the power feed portion 20 on the second surface 12 of the substrate 10 is in the third ground segment 43. Here, the first ground segment 41 and the second ground segment 42 are connected by the third ground segment 43, so that electromagnetic interference can be effectively reduced.

Further, the ground layer 40 further includes two fourth ground segments 44 located at two sides of the third ground segment 43, both the fourth ground segments 44 are connected to the third ground segment 43, the third ground segment 43 is provided with a first jack 45, and the substrate 10 is provided with a second jack 46 corresponding to the first jack 45.

Referring to fig. 3, in the present embodiment, the length of the antenna portion 30 is 26.8mm, the width of the antenna portion 30 is 14mm, the depth of each rectangular groove 31 is 9.8mm, the width of each rectangular groove 31 is 0.8mm, and the width of the connecting segment 33 is 2.4 mm. The width of the feeding portion 20 is 2.0 mm. Referring to fig. 4, 5 and 6, the resonant frequency of the microstrip antenna 100 of the present embodiment is close to 2.45GHz, the standing wave ratio (VSWR) is less than 2, and the out-of-roundness is less than 1dB due to the spatial omnidirectional radiation.

The present invention further provides a television, wherein the television is provided with a microstrip antenna 100, the specific structure of the microstrip antenna 100 refers to the above embodiments, and since the microstrip antenna 100 adopts all technical solutions of all the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and details are not repeated herein. Specifically, a mounting plate 200 is disposed on the back of the television, and a plugging terminal (as shown in fig. 7) adapted to the first jack 45 and the second jack 46 is disposed on the mounting plate 200, and is plugged into the first jack 45 and the second jack 46. Thus, grounding the mounting board 200 can further enhance the forward gain of the television, and is also beneficial to reducing the electromagnetic interference caused by the surrounding main board.

It should be noted that the impedance matching of the microstrip antenna 100 is not affected by the metal background, and the forward gain of the television set is greater than-4 dBi after the microstrip antenna 100 is mounted on the television set. The forward gain of the prior television is generally larger than-10 dBi, so that the television greatly improves the forward gain. In addition, the microstrip antenna 100 of the present invention adopts a side-feed mode, which saves space area and is beneficial to realizing miniaturization; meanwhile, the microstrip antenna 100 of the present invention reduces the feed loss and avoids pattern distortion.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all changes, direct or indirect, which are made by using the contents of the present specification and drawings and are included in the technical field of the present invention are included in the scope of the present invention.

Claims

1. A microstrip antenna, includes the base plate, the base plate includes first surface and with the second surface of first surface relative setting, its characterized in that, microstrip antenna still includes:

a feeding portion arranged on the first surface of the substrate;

the grounding layer is arranged on the second surface of the substrate;

2. The microstrip antenna according to claim 1 wherein the two rectangular slots are symmetrically disposed on both sides of a midpoint connecting line of the long sides of the antenna portion.

3. The microstrip antenna of claim 2 wherein the antenna section has a width W and the rectangular slot has a depth H, wherein 2/3W H W.

4. The microstrip antenna of claim 1 wherein the aperture of the via is in the range of 0.1mm to 0.3 mm.

5. The microstrip antenna of claim 1 wherein the ground layer is disposed in an "I" shape, the ground layer includes a first ground segment, a second ground segment, and a third ground segment connecting the first ground segment and the second ground segment, the projection of the antenna portion on the second surface of the substrate is in the first ground segment, and the projection of the feeding portion on the second surface of the substrate is in the third ground segment.

6. The microstrip antenna according to claim 5 wherein the ground plane further includes two fourth ground sections located at two sides of the third ground section, both the fourth ground sections are connected to the third ground section, both the fourth ground sections are provided with a first jack, and the substrate is provided with a second jack corresponding to the first jack.

7. The microstrip antenna of claim 1 wherein the substrate is an FR4 epoxy board, the substrate having a thickness of 1.6 mm.

8. A television set, characterized in that the microstrip antenna according to any of claims 1 to 7 is mounted on the television set.