A microstrip antenna and terminal used in Beidou

Abstract

The present invention provides a microstrip antenna applied to Beidou, comprising a first dielectric plate, a second dielectric plate and a coaxial feeder, wherein the first dielectric plate and the second dielectric plate are spaced apart, a hollow radiation patch is provided on one side of the first dielectric plate away from the second dielectric plate, a grounding plate is provided on one side of the second dielectric plate close to the first dielectric plate, a feeding part is provided on the other side of the first dielectric plate, a projection of the feeding part relative to the side of the first dielectric plate away from the second dielectric plate is located within the hollow range of the radiation patch, a coupling gap is provided between the feeding part and the radiation patch in a direction parallel to the radiation patch, and the feeding part and the grounding plate are connected via a coaxial feeder. The present invention adopts a hollow radiation patch, which is smaller in overall size than the original radiation patch, and utilizes an L-shaped feeding part and the radiation patch to form a coupled feed, which has the effect of widening the bandwidth, and is more conducive to adjusting the impedance matching and overall radiation efficiency of the antenna compared to the coaxial feeding method.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technology, and in particular to a microstrip antenna and a terminal applied to Beidou. Background Art

[0002] The Beidou antenna designed in the prior art is mainly based on microstrip antennas, which usually use traditional rectangular radiating patches as the main radiators. The above-mentioned microstrip antenna feeding method is to use coaxial line direct feeding, and impedance matching is achieved by cutting corners or adding branches to the radiating patch, and the bandwidth is small. Therefore, the size and shape of the radiating patch are not only related to the impedance matching of the antenna as a whole, but also have a great influence on the radiation efficiency and circular polarization effect of the antenna. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a microstrip antenna and a terminal for Beidou that are conducive to adjusting impedance matching.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a microstrip antenna applied to Beidou, comprising a first dielectric plate, a second dielectric plate and a coaxial feeder, the first dielectric plate and the second dielectric plate are arranged at intervals, a hollow radiation patch is arranged on a side of the first dielectric plate away from the second dielectric plate, and a ground plate is arranged on a side of the second dielectric plate close to the first dielectric plate;

[0005] A feeding part is provided on the other side of the first dielectric plate. The projection of the feeding part relative to the side of the first dielectric plate away from the second dielectric plate is located within the hollow range of the radiation patch. A coupling gap is provided between the feeding part and the radiation patch along a direction parallel to the radiation patch. The feeding part is connected to the ground plate through a coaxial feeder line.

[0006] The beneficial effects of the present invention are as follows: a hollow radiation patch is used, which has a smaller area and an overall smaller size than the original radiation patch, and a coupling feed is formed by using a feeding part and the hollow radiation patch, which not only enables energy to be coupled to the radiation patch through the gap between the first dielectric plate and the second dielectric plate to further expand the bandwidth, but also is more conducive to adjusting the impedance matching of the antenna and the overall radiation efficiency than the original coaxial feeding method. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a side view of a microstrip antenna applied to Beidou in Embodiment 1 of the present invention;

[0008] Figure 2 for Figure 1 A schematic diagram of the planar structure of a square radiation patch on the upper surface of the first dielectric plate;

[0009] Figure 3 for Figure 2 Schematic diagram of the dimensions of the middle square ring;

[0010] Figure 4 It is a schematic diagram of the simulation result of the reflection coefficient of a microstrip antenna applied to Beidou in the first embodiment of the present invention;

[0011] Figure 5 : is a radiation pattern of a microstrip antenna applied to Beidou in the XOZ plane in the first embodiment of the present invention;

[0012] Figure 6 A 3D directional diagram of a microstrip antenna applied to BeiDou in Embodiment 1 of the present invention;

[0013] Description of labels:

[0014] 1. First dielectric plate; 2. Second dielectric plate; 3. Square radiation patch; 4. Ground plate; 5. Coaxial feed line; 6. Feeding part of L-shaped structure; 7. Radiation branch of L-shaped structure; 8. Radiation branch of T-shaped structure. DETAILED DESCRIPTION

[0015] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0016] The most critical concept of the present invention is that coupling feeding is formed between the feeding part and the hollow radiation patch, which is beneficial to adjusting the impedance matching of the antenna and the overall radiation efficiency.

[0017] Please refer to Figure 1 as well as Figure 2 , a microstrip antenna applied to Beidou, comprising a first dielectric plate, a second dielectric plate and a coaxial feeder, wherein the first dielectric plate and the second dielectric plate are spaced apart, a hollow radiation patch is arranged on a side of the first dielectric plate away from the second dielectric plate, and a ground plate is arranged on a side of the second dielectric plate close to the first dielectric plate;

[0018] A feeding part is provided on the other side of the first dielectric plate. The projection of the feeding part relative to the side of the first dielectric plate away from the second dielectric plate is located within the hollow range of the radiation patch. A coupling gap is provided between the feeding part and the radiation patch along a direction parallel to the radiation patch. The feeding part is connected to the ground plate through a coaxial feeder line.

[0019] From the above description, it can be seen that the beneficial effects of the present invention are: the use of a hollow radiation patch has a smaller area and a smaller overall size than the original radiation patch, and the use of a feeding part and a hollow radiation patch to form a coupled feeding can not only enable the energy to be coupled to the radiation patch through the gap between the first dielectric plate and the second dielectric plate to further expand the bandwidth, but also is more conducive to adjusting the impedance matching of the antenna and the overall radiation efficiency than the original coaxial feeding method.

[0020] Furthermore, the radiation patch is a square ring structure.

[0021] It can be seen from the above description that the circular polarization radiation of the antenna can be more easily achieved through the symmetry of the square structure.

[0022] Furthermore, the feeding part is an L-shaped structure;

[0023] The direction of the included angle of the feeding portion of the L-shaped structure is the same as the direction of one corner of the square radiation patch;

[0024] The two right-angled sides of the feeding portion of the L-shaped structure respectively have equal coupling gaps with the adjacent sides of the square radiation patch facing the same angle.

[0025] From the above description, it can be seen that the two right-angled sides of the L-shaped feeding part have equal coupling gaps with the adjacent sides of the square radiation patch facing the same angle, which is conducive to coupling and feeding the L-shaped feeding part with the square radiation patch.

[0026] Furthermore, a radiation portion is provided on a surface of the first dielectric plate away from the second dielectric plate. The radiation portion is located in the hollow range of the square radiation patch and is connected to the radiation patch.

[0027] It can be seen from the above description that providing a radiating portion within the hollow range of the square radiating patch is beneficial to increasing the bandwidth of the antenna and improving the impedance matching of the antenna.

[0028] Furthermore, the radiation part includes two L-shaped radiation branches, which are respectively located at diagonal positions in the square radiation patch and are rotationally symmetrically arranged, and both ends of the L-shaped radiation branches are respectively connected to the radiation patch.

[0029] From the above description, it can be seen that two L-shaped radiation branches are set at the diagonals of the square radiation patch. The two L-shaped radiation branches make the square radiation patch produce two orthogonal linear polarization components. The two orthogonal linear polarization components have a phase difference of 90°, forming circularly polarized wave radiation.

[0030] Furthermore, the radiation part also includes two T-shaped radiation branches, and the two T-shaped radiation branches respectively include mutually perpendicular transverse branches and vertical branches, and one end of the vertical branch is connected to the middle end of the transverse branch, and the other end of the vertical branch is connected to the inner side of the square radiation patch.

[0031] From the above description, it can be seen that two T-shaped radiation branches are arranged in the hollow range of the square radiation patch. The two T-shaped radiation branches can change the current direction of the antenna, increase the current path of the antenna, increase the resonant frequency, widen the bandwidth, and further improve the impedance matching of the antenna.

[0032] Furthermore, the coaxial feed line includes an outer core and an inner core, the outer core is connected to the ground plate, and the inner core is connected to the feeding part of the L-shaped structure.

[0033] It can be seen from the above description that the outer core is connected to the ground plate, and the inner core is connected to the feeding part of the L-shaped structure to avoid affecting the antenna radiation.

[0034] Furthermore, the connection position between the coaxial feed line and the feeding portion of the L-shaped structure is the connection point of two right-angle sides of the feeding portion of the L-shaped structure.

[0035] It can be seen from the above description that the connection position of the coaxial feed line is at the connection of the two right-angle sides of the feeding part of the L-shaped structure, which can provide better impedance matching.

[0036] Furthermore, a terminal includes the microstrip antenna applied to Beidou.

[0037] From the above description, it can be seen that the microstrip antenna applied to Beidou can be used in the terminal.

[0038] Please refer to Figure 1-Figure 5 , Embodiment 1 of the present invention is:

[0039] like Figure 1 As shown, the microstrip antenna applied to Beidou in this embodiment includes a first dielectric plate 1, a second dielectric plate 2 and a coaxial feed line 5, the first dielectric plate 1 and the second dielectric plate 2 are spaced apart, a hollow square radiation patch 3 is provided on a side of the first dielectric plate 1 away from the second dielectric plate 2, and a ground plate 4 is provided on a side of the second dielectric plate 2 close to the first dielectric plate 1;

[0040] An L-shaped feeding portion 6 is provided on the other side of the first dielectric plate 1. The projection of the L-shaped feeding portion 6 relative to the side of the first dielectric plate 1 away from the second dielectric plate 2 is located within the hollow range of the square radiation patch 3. A coupling gap exists between the L-shaped feeding portion 6 and the square radiation patch 3 in a direction parallel to the square radiation patch 3. The L-shaped feeding portion 6 is connected to the ground plate 4 via a coaxial feed line 5.

[0041] like Figure 2 As shown, the L-shaped feeding portion 6 includes two branches perpendicular to each other, the long sides of the two branches of the L-shaped feeding portion 6 are equal in length, and the direction of the angle of the L-shaped feeding portion 6 is the same as the direction of the upper right corner of the square radiation patch 3;

[0042] The two branches of the L-shaped feeding portion 6 have equal coupling gaps with the adjacent sides of the upper right corner of the square radiation patch 3 .

[0043] The coaxial feed line 5 includes an outer core and an inner core. The outer core is connected to the ground plate 4 , and the inner core is connected to the connection between two branches of the L-shaped feeding part 6 .

[0044] Two L-shaped radiation branches 7 are also provided on one side of the first dielectric plate 1 away from the second dielectric plate 2. The L-shaped radiation branches 7 include two branches perpendicular to each other. The two branches of the L-shaped radiation branches 7 are respectively connected to two adjacent inner sides of the square ring 3. The two L-shaped radiation branches 7 are respectively arranged at a right angle to the upper left of the square radiation patch 3 and at a right angle to the lower right of the square radiation patch 3.

[0045] Two T-shaped radiating branches 8 are also provided on one side of the first dielectric plate 1 away from the second dielectric plate 2. The two T-shaped radiating branches 8 respectively include mutually perpendicular transverse branches and vertical branches, and one end of the vertical branch is connected to the middle end of the transverse branch. The other ends of the vertical branches of the two T-shaped radiating branches 8 are respectively connected to the left side and the lower side of the square radiation patch 3.

[0046] Embodiment 2 of the present invention is:

[0047] A terminal includes the microstrip antenna applied to Beidou according to the first embodiment above.

[0048] The selection of the sizes of various components in the first embodiment is related to the frequency and structure of the antenna, and therefore, a preferred example is given below.

[0049] like Figure 1 As shown, the materials of the first dielectric plate 1 and the second dielectric plate 2 are respectively Rogers 5870 plates with a thickness of 0.5 mm, the sizes of the first dielectric plate and the second dielectric plate are respectively 100*100 mm, and the distance between the first dielectric plate 1 and the second dielectric plate 2 is 6 mm;

[0050] like Figure 3 As shown, the side length L of the outer periphery of the square radiation patch 3 is 59 mm, and the width M is 10 mm;

[0051] The side length L determines the center frequency of operation. The side length is about one-quarter of the antenna wavelength λg / 4, which reduces the area of ​​the radiating patch. Compared with the microstrip patch antenna, the overall size is reduced by half.

[0052] The lengths L1 of the long sides of the two branches of the L-shaped feeding part are 8 mm respectively, and the width M1 of the L-shaped feeding part is 2 mm, and the coupling gap N between the L-shaped feeding part and the square ring is 0.8 mm;

[0053] The length L2 of the long side of the radiating branch of the L-shaped structure is 17 mm, the length L3 of the short side is 5 mm, and the width M2 of the radiating branch of the L-shaped structure is 2 mm;

[0054] The length L4 of the lateral branches of the T-shaped radial branches is 5 mm, the length L5 of the vertical branches is 6 mm, and the width M3 of the lateral branches and the vertical branches are both 2 mm;

[0055] In the first embodiment of the present invention, the microstrip antenna made of the above dimensions and applied to Beidou, the key point of coupling feeding lies in the width of the coupling gap. The narrower the coupling gap, the greater the coupled energy. Selecting a suitable coupling distance facilitates adjusting the impedance matching of the antenna. Figure 4 This is a schematic diagram of the reflection coefficient simulation results of the microstrip antenna used in Beidou. In the figure, the horizontal axis Freq represents the frequency, and the vertical axis S(1,1) represents the reflection coefficient of the port, which describes the impedance bandwidth of 1.56-1.59GHz when S(1,1) is less than -10dB; Figure 5 This is the radiation pattern of the microstrip antenna used in Beidou in the XOZ plane. The image is a figure-8 shape with one end large and the other end small, and it shows a stable radiation direction characteristic at the frequency point. Figure 6 The design scheme to simulate the 3D radiation pattern of the microstrip antenna applied to BeiDou is described.

[0056] In summary, the present invention provides a microstrip antenna and terminal for Beidou, which adopts a hollow square radiation patch, which has a smaller area and smaller overall size than the original radiation patch. The L-shaped feeding part and the square radiation patch form a coupled feed, which can further expand the bandwidth and is more conducive to adjusting the impedance matching of the antenna and the overall radiation efficiency. L-shaped radiation branches are respectively arranged at the diagonals of the square radiation patch to form an orthogonal electric field, and two T-shaped radiation branches are arranged to further improve the impedance matching of the antenna. The combined application of two T-shaped radiation branches and two L-shaped radiation branches is beneficial to improving the bandwidth and circular polarization effect of the antenna.

[0057] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A microstrip antenna applied to Beidou, characterized in that: It comprises a first dielectric plate, a second dielectric plate and a coaxial feed line, wherein the first dielectric plate is spaced apart from the second dielectric plate, a hollow radiation patch is arranged on a side of the first dielectric plate away from the second dielectric plate, and a grounding plate is arranged on a side of the second dielectric plate close to the first dielectric plate; A feeding portion is provided on the other side of the first dielectric plate, a projection of the feeding portion relative to a side of the first dielectric plate away from the second dielectric plate is located within the hollow range of the radiation patch, a coupling gap is provided between the feeding portion and the radiation patch along a direction parallel to the radiation patch, and the feeding portion is connected to the ground plate through a coaxial feeder line; The radiation patch is a square ring structure; A radiation portion is further provided on a side of the first dielectric plate away from the second dielectric plate, and the radiation portion is located in the hollow range of the square radiation patch and connected to the radiation patch; The radiation part comprises two L-shaped radiation branches, the two L-shaped radiation branches are respectively located at diagonal positions in the square radiation patch and are rotationally symmetrically arranged between the two L-shaped radiation branches, and the two ends of the L-shaped radiation branches are respectively connected to the radiation patch; The feeding part is an L-shaped structure; The direction of the included angle of the feeding portion of the L-shaped structure is the same as the direction of one corner of the square radiation patch; The two right-angled sides of the feeding portion of the L-shaped structure respectively have equal coupling gaps with the adjacent sides of the square radiation patch facing the same angle; The long sides of the two right-angled sides of the L-shaped feeding part are 8 mm in length and 2 mm in width; the coupling gap between the L-shaped feeding part and the radiation patch is 0.8 mm.

2. A microstrip antenna applied to BeiDou according to claim 1, characterized in that: The radiation part also includes two T-shaped radiation branches, which respectively include mutually perpendicular transverse branches and vertical branches, one end of the vertical branch is connected to the middle end of the transverse branch, and the other end of the vertical branch is connected to the inner side of the square radiation patch.

3. The microstrip antenna applied to BeiDou according to claim 1, characterized in that: The coaxial feed line comprises an outer core and an inner core, wherein the outer core is connected to a ground plate, and the inner core is connected to a feeding part of an L-shaped structure.

4. The microstrip antenna applied to BeiDou according to claim 1, characterized in that: The connection position between the coaxial feed line and the feeding portion of the L-shaped structure is the connection point of two right-angle sides of the feeding portion of the L-shaped structure.

5. A terminal, characterized in that: A microstrip antenna applied to Beidou comprising the method described in any one of claims 1 to 4.

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