WO2018010609A1

WO2018010609A1 - Microstrip dual-layer antenna

Info

Publication number: WO2018010609A1
Application number: PCT/CN2017/092304
Authority: WO
Inventors: 覃梅花
Original assignee: 覃梅花
Priority date: 2016-07-09
Filing date: 2017-07-08
Publication date: 2018-01-18
Also published as: WO2018010410A1; WO2018010457A1; CN106207425A; CN106207425B

Abstract

Disclosed is a microstrip dual-layer antenna, comprising a first PCB and a second PCB stacked together. A top surface of the first PCB is provided with a first microstrip unit, the first microstrip unit comprising two symmetrically arranged microstrip vibration sets having the same shape. A top surface of the second PCB is provided with a second microstrip unit. When the first PCB and the second PCB are stacked, the second microstrip unit is located on the top surface of the second PCB and a bottom surface of the first PCB. Via an excellent dual-layer structural design and continuous testing and parameter adjustment, the present invention achieves excellent antenna performance and gain with good front-to-back ratio characteristics. The antenna has the features of a low profile, a wide band and a high gain. The 10dB impedance bandwidth of the antenna is 28.4%, and the average gain of a single antenna is 8.2dBi.

Description

Microstrip double layer antenna

Technical field

The present invention relates to a microstrip double layer antenna.

Background technique

[0002] An antenna is a device that converts a high-frequency current into a radio wave and emits it into a space, while collecting radio waves and generating a high-frequency current. The antenna can be regarded as a tuned circuit composed of a capacitor and an inductor; at some frequency points, the capacitive and inductive properties of the tuned circuit cancel each other out, and the circuit exhibits pure resistivity, which is called resonance, and the resonance phenomenon corresponds to The working frequency is the resonant frequency point, and the energy at the antenna resonant frequency point has the strongest radiation characteristics. An antenna structure having a resonance characteristic is referred to as an antenna antenna, and an antenna structure in which a high-frequency current is directly excited is referred to as an active antenna, and vice versa as a passive antenna; in an existing antenna, an antenna is required according to actual needs In order to make the resonant frequency of the antenna meet the set requirements, the input impedance of the antenna needs to be adjusted. The adjusted antenna and the common antenna still cannot meet the requirements of the current communication standard. Currently, the communication standard is getting higher and higher. The requirements of the antenna are also getting higher and higher. The gain, directionality and front-to-front ratio of the current antenna need to be broken.

technical problem

Problem solution

Technical solution

[0003] It is an object of the present invention to overcome the above-discussed shortcomings and to provide a microstrip double layer antenna.

[0004] In order to achieve the above object, the specific solution of the present invention is as follows: A microstrip double layer antenna includes a first PCB board and a second PCB board stacked together; the top surface of the first PCB board is provided with a microstrip unit, the first microstrip unit includes two microstrip sets of the same shape and symmetrically arranged; the second microplate unit is provided on the top surface of the second PCB board; the first PCB board and the second PCB After the board is stacked, the second microstrip unit is located on the top surface of the second PCB and the bottom surface of the first PCB.

[0005] wherein each microstrip vibration set includes a trapezoidal trapezoidal vibrator arm, a first triangular arm and a second angular arm respectively disposed on two sides of the trapezoidal vibrator arm; a first angular arm, An arc-shaped connecting arm is connected between the two-armed arm and the trapezoidal vibrator arm; [0006] one corner of each of the first corner arm and the second corner arm is directed to the center of the first PCB board; each of the first corner arm and the second corner arm is disposed at a corner near the center of the first PCB board Empty slot; each of the first and second corner arms is further provided with a hollowing unit, the hollowing unit includes an F-shaped hollowing bar; each first microstrip unit further comprises two rectangular feeding pieces, each microstrip The set of trapezoidal vibrator arms is respectively coupled to the corresponding rectangular feed piece

[0007] The second microstrip unit includes a circular annular radiating arm, and the annular radiating arm extends inwardly with two oppositely disposed crossbars, each of which extends toward the center to form an arc of an arc Radiation arm.

[0008] Wherein, two feeding coupling pieces are respectively provided with a coupling gap.

[0009] Wherein, the first PCB board and the second PCB board are stacked together, and each crossbar is located in a vertical projection area of the trapezoidal vibrator arm of the corresponding microstrip.

[0010] wherein, the three corners of each of the first corner arm and the second corner arm are arc angles.

[0011] wherein, the maximum distance between the two arc-shaped radiating arms is M, the minimum distance is N, and the length of the strip-shaped empty slot is L, then M=N+0.86L.

[0012] wherein, the first PCB board and the second PCB board are both square, and the L-shaped isolated microstrip arms are disposed at four corners of the first PCB board;

[0013] wherein, two microstrip vibration sets are provided with two T-shaped parasitic oscillator arms;

[0014] wherein, the first PCB board and the second PCB board are both square, and the first PCB board and the second PCB board are provided with rectangular parasitic vibrator arms on two sides; the beneficial effects of the invention

Beneficial effect

[0015] Through the excellent double-layer structure design, through continuous experiment and parameter adjustment, excellent antenna performance and gain with good front-to-back ratio characteristics are achieved. The antenna has the characteristics of low profile, wide band, and high gain. The antenna 10 (18 impedance bandwidth 28.4%, single antenna average gain 8.2 dBi.

Brief description of the drawing

DRAWINGS

1 is a front view of the present invention;

2 is a plan view of a first PCB board; [0017] FIG.

3 is a plan view of a second PCB board; [0018] FIG. 4 is a schematic structural view of a microstrip vibration set;

5 is a simulation and test graph of the S11 parameters of the antenna embodiment of the present invention.

6 is a gain simulation test curve diagram and an efficiency test curve diagram of an antenna embodiment of the present invention;

7 is a normalized radiation pattern at 5 GHz of an embodiment of the antenna of the present invention.

[0023] The reference numerals in FIGS. 1 to 7 illustrate:

[0024] HI-first PCB board; HI 1-ladder oscillator arm; H12-arc connection arm; H13-first angle arm; H14-second angle arm; H15-bar slot; H16-skull unit; H17-shaped hollow rod;

[0025] H2-second PCB board; H21-ring radiating arm; H22-crossbar; H23-arc radiating arm;

[0026] H3-rectangular feed piece; H4-rectangular parasitic oscillator arm; H5-isolated microstrip arm; H6-T-shaped parasitic oscillator arm.

Embodiments of the invention

The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments, which are not intended to limit the scope of the invention.

[0028] As shown in FIG. 1 to FIG. 7, a microstrip double layer antenna according to this embodiment includes a first PCB board HI and a second PCB board H2 stacked together; the first PCB board The top surface of the HI is provided with a first microstrip unit, and the first microstrip unit includes two microstrip sets of the same shape and symmetrically disposed; the second microstrip unit is disposed on the top surface of the second PCB board H2; A PCB board HI and a second PCB board H2 are stacked, and the second microstrip unit is located on the top surface of the second PCB board H2 and the bottom surface of the first PCB. A microstrip double layer antenna, each microstrip according to this embodiment The vibration set includes a trapezoidal trapezoidal arm HI 1 , a triangular first arm H13 and a second corner arm H14 respectively disposed on both sides of the trapezoidal arm HI 1 ; the first corner arm H13 and the second corner An arc connecting arm H12 is connected between the arm H14 and the trapezoidal vibrator arm HI 1; one corner of each of the first corner arm H13 and the second corner arm H14 is directed to the center of the first PCB board HI; each first a corner slot H15 is disposed at an angle of the corner arm H13 and the second corner arm H14 near the center of the first PCB board HI; each of the first corner arm H13 and the second corner arm H14 is further provided with a hollowing unit H16. The hollow unit H16 includes an F-shaped hollow rod H17; each microstrip vibration set further includes a rectangular feed piece H3, and each of the microstrip set trapezoidal vibrator arms H11 is fed with a corresponding rectangular feed piece H3 Coupling connection. The second microstrip unit includes a circular annular radiating arm H21, and the annular radiating arm H21 extends inwardly with two oppositely disposed crossbars H22, each of which extends arcuately toward the center. Curved radiating arm H23. The first PCB board HI and the second PCB board H2 are stacked, the first microstrip unit and The second microstrip unit interacts with 吋, and can achieve excellent antenna characteristics after avoiding coupling interference as much as possible. Referring to FIG. 5, the simulation and test IS11I parameters of the embodiment of the present invention are in good agreement, and the tested 10 dB impedance bandwidth is 28.4. %, the stop band IS11I is close to zero. Referring to FIG. 6, the gain curve of the simulation and the test in the embodiment of the present invention is in agreement, the average gain in the passband is 8.2 dBi, and the roll-off edge has a high roll-off degree, and the out-of-band rejection exceeds in a wide stop band. 20dBi, better filtering effect in the range of 0~10GHz. The in-band efficiency of the embodiments of the present invention is as high as 95%. See Figure 7, a normalized pattern at a center frequency of 5 GHz. The maximum radiation direction is directly above the radiator, and the main polarization is greater than the cross polarization by more than 25 dBi. The pattern of the other frequencies in the passband is similar to the 5 GHz pattern, and the pattern in the entire passband is stable.

[0029] A microstrip double layer antenna according to this embodiment has a coupling gap adjacent to each of the two feeding coupling pieces. Can effectively reduce coupling interference.

[0030] In the microstrip double-layer antenna of the embodiment, the first PCB board HI and the second PCB board H2 are stacked together, and each crossbar H22 is located on the trapezoidal vibrator arm of the corresponding microstrip set. Within the vertical projection area of H11. Increase gain and reduce off-site interference.

[0031] In the microstrip double layer antenna according to the embodiment, the three corners of each of the first corner arm H13 and the second corner arm H14 are arc angles. The current is smoother and the bandwidth is increased.

[0032] In the microstrip double layer antenna according to this embodiment, the maximum distance between the two curved radiating arms H23 is M, the minimum distance is N, and the length of the strip empty slot H15 is L, then M= N+0.86L. When this formula is satisfied, the average gain in the passband can be measured to a level of 9.15 dBi.

[0033] In the microstrip double-layer antenna of the embodiment, the first PCB board HI and the second PCB board H2 are both square, and the first corner of the first PCB board HI is L-shaped. Isolated microstrip arm H5; increases isolation and reduces standing wave ratio.

[0034] A microstrip double-layer antenna according to the embodiment, two T-shaped parasitic oscillator arms H6 are disposed between two microstrip vibration centers; a convex arm of a specific T-shaped parasitic oscillator arm H6 is disposed at two Between two adjacent first corner arms H13 of the microstrip set, the convex arm of the other T-shaped parasitic arm H6 is disposed between two adjacent first corner arms H13 of the two microstrip sets. It can effectively reduce the standing wave ratio and improve the antenna characteristics.

[0035] In the microstrip double layer antenna of the embodiment, the first PCB board HI and the second PCB board H2 are both square, and the first PCB board HI and the second PCB board H2 have two A rectangular parasitic oscillator arm H4 is provided on the side; the gain is effectively increased. The above description is only a preferred embodiment of the present invention, and equivalent changes or modifications made to the structures, features, and principles described in the scope of the present invention are included in the scope of protection of the present patent application.

Claims

Claim

[Claim 1] A microstrip double layer antenna, comprising: a first PCB board stacked together (

HI) and a second PCB board (H2); the top surface of the first PCB board (HI) is provided with a first microstrip unit, and the first microstrip unit includes two microstrip sets of the same shape and symmetrically arranged a second microstrip unit is disposed on the top surface of the second PCB board (H2); a first PCB board (HI) and a second PCB board (H2) are stacked, and the second microstrip unit is located on the second PCB board (H2) a top surface and a first PCB bottom surface; the first PCB board (HI) and the second PCB board (H2) are both square, and the first PCB board (HI) has an L-shaped isolation at four corners Microstrip arm (H5); two T-shaped parasitic oscillator arms (H6) are provided between the two microstrip oscillation sets; each microstrip vibration set includes a trapezoidal trapezoidal vibrator arm (H11), which is respectively disposed on the trapezoidal vibrator The first triangular arm (H13) and the second angular arm (H14) on both sides of the arm (H11); the first angular arm (H13), the second angular arm (H14) and the trapezoidal vibrator arm (H11) A curved connecting arm (H12) is connected between each; a corner of each of the first corner arm (H13) and the second corner arm (H14) points to the first PCB board (HI) Center; each of the first corner arm (H13) and the second corner arm (H14) is provided with a strip-shaped recess (H15) at a corner near the center of the first PCB (HI); each first arm (H13) There is also a hollow unit (H16) on the second angle arm (H14), and the hollow unit (H16) includes an F-shaped hollow rod (H17); the first microstrip unit further includes two rectangular feed pieces (H3) Each of the microstrip-collected trapezoidal vibrator arms (H11) is respectively coupled to a corresponding rectangular feed piece (H3); the second microstrip unit includes a circular annular radiating arm (H21), The annular radiating arm (H21) extends inwardly with two oppositely disposed crossbars (H22), and each crossbar (H22) extends toward the center to form an arcuate curved radiating arm (H23); two feeds A coupling gap is provided adjacent to the coupling piece.

[Claim 2] A microstrip double layer antenna according to claim 1, wherein: the first PC

The B-plate (HI) and the second PCB (H2) are stacked together, and each crossbar (H22) is located in the vertical projection area of the trapezoidal vibrator arm (H11) of the corresponding microstrip.

[Claim 3] A microstrip double layer antenna according to claim 1, wherein: each of the first corner arm (H13) and the second corner arm (H14) has a circular arc angle . [Claim 4] A microstrip double layer antenna according to claim 1, wherein: the maximum distance between the two curved radiating arms (H23) is M, and the minimum distance is N, the strip empty slot The length of (H15) is L, then M = N + 0.86L.