Small broadband circular polarized antenna working in odd and even modes

A circularly polarized antenna, small-scale technology, applied in the direction of resonant antenna, resonant antenna parts, radiating element structure, etc., can solve the problems of low radiation efficiency, narrow axial ratio bandwidth, narrow impedance bandwidth, etc., to achieve low profile, The effect of wide axial ratio bandwidth and wide impedance bandwidth

Active Publication Date: 2018-08-31
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, traditional small circularly polarized antennas often face shortcomings such as narrow impedance bandwidth, narrow axial ratio bandwidt

Method used

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  • Small broadband circular polarized antenna working in odd and even modes
  • Small broadband circular polarized antenna working in odd and even modes
  • Small broadband circular polarized antenna working in odd and even modes

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Embodiment Construction

[0021] The implementation of the present invention will be described in detail below in conjunction with the drawings and examples.

[0022] The invention is a design of a small broadband circularly polarized antenna working in odd and even modes. It has the characteristics of simple structure, miniaturization, low profile, wide axial ratio bandwidth, wide impedance bandwidth, and high radiation efficiency. According to the design schematic, a specific embodiment of a broadband dual-mode circularly polarized antenna applied to the 433MHz ISM frequency band is given, which will be described below in conjunction with the accompanying drawings:

[0023] refer to figure 1 with figure 2 , the antenna includes a metal vibrator 1 , a feeding layer 5 , a metal probe one 6 and a metal probe two 7 . Among them, there are feed point one 3 and feed point two 4 and open slot 2 on the metal vibrator 1 . Metal probe one 6 connects the feed point one 3 on the metal vibrator 1 with the fe...

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Abstract

The invention provides a small broadband circular polarized antenna working in odd and even modes. The antenna comprises a metal oscillator, a feed layer and two metal probes. An open circuit groove and two feeding points are arranged in/on the metal oscillator. When common-mode feeding is performed on excitation signals, a plane reverse F antenna mode can be stimulated. When difference-mode feeding is performed on the excitation signals, a groove antenna mode can be stimulated. Through the polarization orthogonality of the two working modes, the feeding layer provides 90 degrees of phase difference to excitation signals in the common-mode and the difference mode, so radiation characteristics of the broadband circular polarization can be obtained. The antenna is advantaged in that 1) through one short circuit metal oscillator with an open groove, two kinds of quarter-wave resonance modes of orthogonal polarization are generated; and 2), the two working modes share a radiation mouth face, so the utilization rate of the mouth rate is improved. According to the invention, small, low-profile, broadband, high-efficiency and low-cost circular polarization characteristics can be achieved.

Description

technical field [0001] The invention belongs to the technical field of antennas, and relates to circularly polarized antennas, in particular to a small broadband circularly polarized antenna working in even and odd modes. Background technique [0002] The polarization of electromagnetic waves refers to the trajectory of the electric field vector during the movement of electromagnetic waves. According to different polarizations, antennas can be divided into linearly polarized antennas, circularly polarized antennas and elliptical polarized antennas. Since ordinary linearly polarized antennas can receive maximum energy only when the polarization of the transmitting antenna and the receiving antenna are aligned and aligned, in many application scenarios, the position of the antenna is often changing and cannot be kept aligned all the time. It will cause the polarization of the transmitting antenna to deviate from that of the receiving antenna, greatly affecting the communicati...

Claims

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Application Information

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IPC IPC(8): H01Q1/38H01Q9/04H01Q9/06
CPCH01Q1/38H01Q9/04H01Q9/06
Inventor 孙利滨李越张志军冯正和
Owner TSINGHUA UNIV
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