Circularly polarized magnetoelectric dipole antenna with dual-port coaxial feed

By designing a circularly polarized magnetoelectric dipole antenna with dual-port coaxial feed, and employing a cross-arranged Γ-shaped feed probe and a metal through-hole-radiating patch structure, a wide-bandwidth, wide-beam, and stable circularly polarized radiation is achieved. This solves the performance bottleneck of existing magnetoelectric dipole antennas in low-Earth orbit satellite communication and is suitable for the integration and miniaturization of low-Earth orbit satellite communication terminals.

CN121812929APending Publication Date: 2026-04-07THE 54TH RESEARCH INSTITUTE OF CHINA ELECTRONICS TECHNOLOGY GROUP CORPORATION +2
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Patent Information

Application Number
CN202610281876.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-10
Publication Date
2026-04-07

AI Technical Summary

Technical Problem

Existing magnetoelectric dipole antennas suffer from insufficient circular polarization capability, narrow beamwidth, complex structure, and high cost in low-Earth orbit satellite communications, making it difficult to meet the demand for high-performance terminal antennas in low-Earth orbit satellite communications.

Method used

Design a dual-port coaxially fed circularly polarized magnetoelectric dipole antenna. It adopts a cross-arranged Γ-type feed probe combination structure, combined with a metal through-hole-radiating patch, and forms a 90° phase difference through dual-port orthogonal feeding to achieve stable circularly polarized radiation.

Benefits of technology

It achieves stable circular polarization radiation in the 26.0GHz-37.2GHz frequency band, with an impedance bandwidth of 35%, a gain of 6.5dB, a half-power beamwidth of over 90°, and a front-to-back ratio of over 20dB, making it suitable for miniaturization and low-cost integration of low-Earth orbit satellite communication terminals.

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Abstract

The invention discloses a dual-port coaxial feed circular polarization magnetoelectric dipole antenna, and belongs to the technical field of millimeter wave satellite communication antennas. The antenna comprises a first metal patch layer, a dielectric substrate a, a second metal patch layer, a dielectric substrate b and a metal ground which are sequentially stacked from top to bottom, the second metal patch layer comprises four radiation patches which are arranged in a rectangular array, and each radiation patch is composed of a square patch and a circular ring patch at an inner corner; a metal through hole is formed in the dielectric substrate and is connected with the radiation patch and the metal ground, so that a magnetoelectric dipole radiation path is formed; the first metal patch layer is provided with a probe patch a, the center of the second metal patch layer is provided with a probe patch b, and the probe patch a and the probe patch b form two space orthogonal inverted L-shaped feed probes through a short column and a long column respectively; and the inner conductors of the two feed ports are respectively connected with the long columns of the two probes. The antenna has the advantages of wide impedance bandwidth, wide beam coverage, low profile and easy integration, and is suitable for a low-orbit satellite communication terminal.
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