Double-feed-point circular polarization microstrip antenna

A microstrip antenna, circularly polarized technology, applied in the direction of antenna, antenna grounding switch structure connection, radiating element structure form, etc., can solve the problem of narrow impedance bandwidth, limited application range, etc., achieve low profile, improve axial ratio and width harmony Vibration band width, easy conformal effect

Inactive Publication Date: 2015-01-21
JIANGSU BELLON TECH
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Problems solved by technology

But because its axial ratio impedance bandwidth is too narrow, its application range is greatly limited.

Method used

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  • Double-feed-point circular polarization microstrip antenna

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Embodiment Construction

[0019] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and understandable, the specific implementation modes of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the above-mentioned and other purposes, features and advantages of the present invention will be clearer. Like reference numerals designate like parts throughout the drawings. The drawings have not been drawn to scale, emphasis instead being placed upon illustrating the gist of the invention.

[0020] Such as figure 1 As shown, the dual-feed circularly polarized microstrip antenna includes from top to bottom: a metal patch 10, a dielectric substrate 20, a ground plate 30, a pcb substrate 40, and a hybrid bridge feed unit (including a hybrid bridge feed chip 50, feed probe 60, ground circuit and isolated port circuit 70).

[0021] The metal patch 10 is located on the upper surface of the dielectri...

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Abstract

A double-feed-point circular polarization microstrip antenna is characterized by sequentially comprising a metal patch, a dielectric substrate, a grounding plate, a pcb substrate and a mixed electric bridge feed unit from top to bottom, and all the components are integrated in a laminated and stickup mode; the metal patch and the grounding plate are arranged on the upper surface and the lower surface of the dielectric substrate respectively; the mixed electric bridge feed unit comprises a mixed electric bridge feed chip, feed probes, a grounding circuit and an isolated port circuit, and the mixed electric bridge feed chip, the feed probes, the grounding circuit and the isolated port circuit are all arranged on the lower surface of the pcb substrate; two output ports of the mixed electric bridge feed chip are connected with the two feed probes respectively, penetrate through the pcb substrate and the dielectric substrate and are connected with the metal patch on the upper surface of the dielectric substrate. Due to the positions where the two feed probes are located, while retaining phi=0 degree, a radiation waveform generates phase deviation of phi=90 degrees. Circular polarization radiation is achieved well, the bandwidth is large in the omnidirectional range, the antenna is small in size, low in section, light in weight and simple in structure, and the conformal effect is easy to achieve.

Description

technical field [0001] The invention relates to the field of radio frequency identification antennas, in particular to a double-feed point circularly polarized antenna using a composite material dielectric substrate medium. Background technique [0002] With the development of radio frequency identification technology and the needs of the industry, it is difficult for a single polarization method to meet the requirements. The application of circularly polarized antennas is very important, because the use of circularly polarized antennas can reduce signal loss under different tag phases. In addition, in many practical applications, antennas are required to have the characteristics of light weight, small size, conformability, and low cost. Circularly polarized microstrip patch antennas are ideal antennas that can meet these requirements. [0003] At present, there are two main methods to realize circularly polarized radiation by using a single patch antenna: single-fee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q1/38H01Q13/08H01Q1/50
Inventor 陈昊
Owner JIANGSU BELLON TECH
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