A Circularly Polarized Microstrip Antenna with Wide Bandwidth and Axial Ratio Beam

A microstrip antenna, circular polarization technology, applied in the direction of antenna, antenna grounding switch structure connection, electrical components, etc., can solve the problems of increasing the effective radiation area, the antenna bandwidth cannot cover the four major satellite navigation systems, etc., to achieve low cost , high precision and simple structure

Active Publication Date: 2021-03-30
HARBIN ENG UNIV
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Problems solved by technology

The methods for expanding the bandwidth of microstrip antennas usually include adding parasitic elements, increasing the antenna profile, and using dielectric plates with high dielectric constants. Although these methods can achieve broadband characteristics, the antenna bandwidth cannot cover the four commonly used satellite navigation systems; The methods of expanding the axial ratio beam width with antennas include multi-layer stacking structure, introducing circular current and increasing the effective radiation area, etc., but most of them are for single-frequency point antennas
Currently, few microstrip antennas simultaneously achieve the performance of a wide bandwidth beam

Method used

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  • A Circularly Polarized Microstrip Antenna with Wide Bandwidth and Axial Ratio Beam
  • A Circularly Polarized Microstrip Antenna with Wide Bandwidth and Axial Ratio Beam
  • A Circularly Polarized Microstrip Antenna with Wide Bandwidth and Axial Ratio Beam

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specific Embodiment

[0034] This embodiment provides a wide bandwidth axial ratio beam circularly polarized microstrip antenna with a center frequency of 1.46 GHz, and its structure is as follows figure 1 , 2 As shown, it mainly includes:

[0035] The dielectric substrate 1 is FR-4 with a dielectric constant of 4.4 and a thickness of 0.8mm. The top layer of the dielectric substrate is printed with annular parasitic units 6 and the bottom is printed with octagonal parasitic units 7 .

[0036] The dielectric substrate 3 is FR-4 with a dielectric constant of 4.4 and a thickness of 0.8 mm. The top layer of the dielectric substrate is printed with an octagonal main patch 8 and a parasitic unit 9 .

[0037] The dielectric substrate 5 is Rogers 4350B with a dielectric constant of 3.66 and a thickness of 0.508 mm. The top layer of the dielectric substrate is printed with a reflector 10 and the bottom is printed with a feed point network 11 . The coaxial probe 12 passes through the dielectric substrate 3...

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Abstract

The invention provides a broadband wide-axis-ratio beam circularly polarized microstrip antenna. The antenna feeds a radiation patch through a broadband feed network to obtain broadband circular polarization characteristics. According to the antenna, the radiation patch is coupled with the parasitic unit and the metal column, and vertical current is introduced to the metal column so that the amplitude and the phase of a far-zone electric field component are changed, and a wide beam characteristic is obtained. The antenna bandwidth covers four common satellite navigation system working frequency points and can be applied to a multimode satellite navigation receiver.

Description

technical field [0001] The invention relates to a beam circularly polarized microstrip antenna with wide bandwidth and axial ratio, and belongs to the technical field of antennas. Background technique [0002] With the rapid development of major satellite navigation systems, navigation terminals not only need to be able to receive the signals of major navigation systems, but also to capture the satellite signals of a single satellite navigation system as much as possible, which requires the antenna to be able to achieve broadband, wide beam and other performance . Microstrip antenna has the advantages of small size, light weight, easy conformal, and easy to achieve circular polarization, so it has received extensive attention in the field of satellite navigation. The methods for expanding the bandwidth of microstrip antennas usually include adding parasitic elements, increasing the antenna profile, and using dielectric plates with high dielectric constants. Although these m...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q1/50H01Q1/36H01Q1/38H01Q15/24H01Q19/00H01Q19/02H01Q19/10
CPCH01Q1/36H01Q1/38H01Q1/50H01Q15/24H01Q19/005H01Q19/02H01Q19/10
Inventor 黄平杨光王伟王敬郭猛佟禹辰
Owner HARBIN ENG UNIV
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