CN210806000U

CN210806000U - Single-feed three-frequency circularly polarized patch antenna

Info

Publication number: CN210806000U
Application number: CN201921906483.6U
Authority: CN
Inventors: 陈付昌; 谭茜
Original assignee: South China University of Technology SCUT
Current assignee: South China University of Technology SCUT
Priority date: 2019-11-07
Filing date: 2019-11-07
Publication date: 2020-06-19
Anticipated expiration: 2029-11-07

Abstract

The utility model discloses a single-feed three-frequency circularly polarized patch antenna, which comprises a first dielectric substrate, a second dielectric substrate and an input port; the first dielectric substrate is positioned above the second dielectric substrate, and an air layer is arranged between the first dielectric substrate and the second dielectric substrate; the top surface of the first dielectric substrate is provided with a rectangular radiation patch, wherein two adjacent sides of the rectangular radiation patch are loaded with open circuit stubs with different sizes, and the other two sides are provided with gaps which are parallel to each other and have different sizes; the top surface of the second dielectric substrate is provided with a floor with a gap, the bottom surface of the second dielectric substrate is provided with a micro-strip feeder line of an input port, and the micro-strip feeder line of the input port excites the rectangular radiation patch through the gap on the floor. The utility model discloses can realize different and fine circular polarization characteristic respectively at three frequency channel, have design flexibility, low section, low axial ratio, advantage such as with low costs.

Description

Single-feed three-frequency circularly polarized patch antenna

Technical Field

The utility model belongs to the technical field of the technique of antenna and specifically relates to indicate a three frequency circular polarization patch antenna are presented to single.

Background

The rapid development of satellite wireless systems greatly improves the quality of wireless communication, and multi-frequency multi-polarization antennas applied to wireless communication terminals are more and more concerned. In a dense building place, a large number of multipath reflections can occur, and the circularly polarized antenna can effectively resist the Faraday rotation effect and multipath fading and improve the signal quality. The role of a multi-frequency antenna with similar radiation characteristics for each passband is particularly important in order for the same system to simultaneously meet multiple communication standards. The microstrip planar antenna has the advantages of light weight, easy processing, low profile, low cost and the like, and plays an important role in modern communication terminals. International researchers have proposed multiple patch antenna multi-band and circular polarization implementations.

The prior art is investigated and known, and the details are as follows:

in 2018, Jianfeng Qian et al published ON "IEEE TREASYTION ON ANTENNAS ANDPROPAGATION" an article entitled "A Novel Tri-Band Patch Antenna With broadcasting and Its Application to Filtering Antenna" by loading open branches ON two opposite sides of a rectangular Patch so that TM is a TM With open branches₁₀Mode, TM₂₀Mode and TM₃₀The field distribution of the modes has similar characteristics, and the triple-band antenna with the edge-emitting characteristic is realized.

In 2017, Jin-Dong Zhang et al published an article entitled "Dual-Band and Dual-circular Polarized Single-layer microsystem Array Based ON multiresotant models" ON "IEEE TREASYTION ON ANTENNAS ANDPROPAGATION" by loading open branches ON the four sides of a rectangular patch so that the TM pattern is formed₃₀Field distribution of modes and TM₁₀The field distribution of the modes is similar and the TM is maintained₁₀The field distribution of the mode is substantially constant while making the TM substantially constant₁₀Mode and TM₃₀The moulds have similar edge-fire characteristics and use diagonal anglesThe feed structure obtains the operating characteristics of double-frequency double-circular polarization.

In general, in the prior work, the research on circular polarization and multi-frequency antenna is in a considerable proportion, but most of the multi-frequency antennas are focused on dual-frequency linear polarization or dual-frequency circular polarization, and the feeding structure of circular polarization is mostly double-fed or diagonal single-fed. Therefore, the patch antenna which has the advantages of slot coupling feed, simple structure and three-frequency circular polarization characteristics is designed to have important significance.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome prior art's shortcoming and not enough, provide a simple structure is reliable singly present three frequency circular polarization patch antenna, can realize different and fine circular polarization characteristic respectively in three frequency channel, have design flexibility, low section, low axial ratio, advantage such as with low costs.

In order to achieve the above object, the present invention provides a technical solution: a single-feed three-frequency circularly polarized patch antenna comprises a first dielectric substrate, a second dielectric substrate and an input port; the first dielectric substrate is positioned above the second dielectric substrate, and an air layer is arranged between the first dielectric substrate and the second dielectric substrate; the top surface of the first dielectric substrate is provided with a rectangular radiation patch, wherein two adjacent sides of the rectangular radiation patch are loaded with open circuit stubs with different sizes, and the other two sides are provided with gaps which are parallel to each other and have different sizes; the top surface of the second dielectric substrate is provided with a floor with a gap, the bottom surface of the second dielectric substrate is provided with a micro-strip feeder line of an input port, and the micro-strip feeder line of the input port excites the rectangular radiation patch through the gap on the floor.

Further, the pattern used by the rectangular radiating patch is the first three pairs of orthogonal patterns of the patch: TM₁₀Mode and TM₀₁Mode, TM₂₀Mode and TM₀₂Mode, TM₃₀Mode and TM₀₃And the module sequentially and respectively realizes left-hand circular polarization, left-hand circular polarization and right-hand circular polarization.

Further, the input port is impedance matched for 50 ohms.

Compared with the prior art, the utility model, have following advantage and beneficial effect:

1. the field distribution of the higher-order mode is disturbed by loading the open stub and the grooving technology, and the working characteristics of multi-frequency circular polarization are realized by utilizing the mutual orthogonal characteristics of the open stub and the grooving technology without adding an additional radiator, so that the processing complexity and the volume of the antenna are reduced.

2. By adjusting the phase difference of the orthogonal modes, the first three modes of the rectangular radiation patch have the edge radiation characteristic under the condition of single feed through the gap, and the feed structure of the multi-frequency circularly polarized antenna is effectively simplified.

3. Because the utility model discloses the antenna is the microstrip structure, has light in weight, characteristics with low costs, can realize industry batch production.

Drawings

Fig. 1 is a bottom view of the single-feed triple-band circularly polarized patch antenna of the present invention.

Fig. 2 is the utility model discloses a single-feed three-frequency circular polarization patch antenna's plan view.

Fig. 3 is a side view of the single-feed triple-band circular polarized patch antenna of the present invention.

Fig. 4 is the utility model discloses a simulation result of reflection coefficient of single-feed three-frequency circularly polarized patch antenna.

Fig. 5 is a simulation result of the gain and axial ratio of the single-feed triple-band circularly polarized patch antenna in the normal direction.

Fig. 6a is the simulation result of the radiation pattern (xoz plane and yoz plane) of the single-feed triple-band circularly polarized patch antenna of the present invention at the frequency of 2.5 GHz.

Fig. 6b is the simulation result of the radiation pattern (xoz plane and yoz plane) of the single-feed triple-band circularly polarized patch antenna at the frequency of 3.5 GHz.

Fig. 6c is the simulation result of the radiation pattern (xoz plane and yoz plane) of the single-feed triple-band circularly polarized patch antenna of the present invention at the frequency of 4.4 GHz.

Detailed Description

The present invention will be further described with reference to the following specific embodiments.

Referring to fig. 1 to 3, the single-feed triple-band circularly polarized patch antenna provided in this embodiment includes a first dielectric substrate 1, a second dielectric substrate 2, and an input port (not shown in the drawings); the first dielectric substrate 1 is positioned above the second dielectric substrate 2, and an air layer 3 exists between the first dielectric substrate 1 and the second dielectric substrate 2; a rectangular radiation patch 7 is arranged on the top surface of the first dielectric substrate 1, open-

circuit stubs

8 and 9 with different sizes are loaded on two adjacent sides of the rectangular radiation patch 7, and

gaps

10 and 11 with different sizes parallel to the two sides of the rectangular radiation patch 7 are formed on the other two sides of the rectangular radiation patch 7; the top surface of the second dielectric substrate 2 is provided with a floor 5 with a gap 6, the bottom surface of the second dielectric substrate is provided with a microstrip feeder 4 of an input port, and the microstrip feeder 4 of the input port excites a rectangular radiation patch 7 through the gap 6 on the floor 5; the input port is impedance matched for 50 ohms.

The pattern used by the rectangular radiating patch 7 is the first three pairs of orthogonal patterns of the patch: TM₁₀Mode and TM₀₁Mode, TM₂₀Mode and TM₀₂Mode, TM₃₀Mode and TM₀₃And (5) molding.

Referring to fig. 4, a simulation result of the reflection coefficient of the single-feed triple-band circularly polarized patch antenna of the present embodiment is shown. As can be seen from the figure, the impedance bandwidths of the antennas are 2.45-2.62GHz, 3.40-3.57GHz and 4.28-4.60 GHz. The antenna achieves good impedance matching within the pass band.

Referring to fig. 5, a simulation result of the gains and axial ratios of the single-feed three-frequency circularly polarized patch antenna in the normal directions of the three frequency bands is shown. As can be seen from the figure, the 3-dB axial ratio bandwidths of the three frequency bands of the antenna in the normal direction are 2.48-2.51GHz, 3.50-3.53GHz and 4.41-4.43GHz in sequence, the circular polarization characteristics are left-hand circular polarization, left-hand circular polarization and right-hand circular polarization in sequence, and the gains in the normal direction are 7.44dBi, 8.09dBi and 9.04dBi in sequence. The antenna can realize low axial ratio in a pass band and has good circular polarization characteristic.

Referring to fig. 6a, 6b and 6c, simulation results of radiation patterns of the single-feed triple-band circularly polarized patch antenna at the central frequencies of three pass bands are shown. It can be seen that the antenna achieves good directional radiation characteristics at both the xoz plane and the yoz plane, and the cross polarization is lower than the main polarization. Therefore, the utility model discloses a three frequency circular polarization patch antenna are presented to single has fine application prospect.

The above-mentioned embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, so that all the changes made according to the shape and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A single-feed three-frequency circularly polarized patch antenna is characterized in that: the device comprises a first dielectric substrate, a second dielectric substrate and an input port; the first dielectric substrate is positioned above the second dielectric substrate, and an air layer is arranged between the first dielectric substrate and the second dielectric substrate; the top surface of the first dielectric substrate is provided with a rectangular radiation patch, wherein two adjacent sides of the rectangular radiation patch are loaded with open circuit stubs with different sizes, and the other two sides are provided with gaps which are parallel to each other and have different sizes; the top surface of the second dielectric substrate is provided with a floor with a gap, the bottom surface of the second dielectric substrate is provided with a micro-strip feeder line of an input port, and the micro-strip feeder line of the input port excites the rectangular radiation patch through the gap on the floor.

2. The single-feed triple-band circularly polarized patch antenna of claim 1, wherein: the pattern used by the rectangular radiating patch is the first three pairs of orthogonal patterns of the patch: TM₁₀Mode and TM₀₁Mode, TM₂₀Mode and TM₀₂Mode, TM₃₀Mode and TM₀₃And the module sequentially and respectively realizes left-hand circular polarization, left-hand circular polarization and right-hand circular polarization.

3. The single-feed triple-band circularly polarized patch antenna of claim 1, wherein: the input port is impedance matched for 50 ohms.