Small broadband circular polarized antenna working in odd and even modes

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...

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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 bandwidth, low radiation efficiency, high profile, complex structure, and high manufacturing cost, making it difficult to meet daily communication needs.

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