Low-profile broadband omnidirectional filtering antenna applied to unmanned aerial vehicle communication

Abstract

The invention provides a low-profile broadband omnidirectional filtering antenna applied to unmanned aerial vehicle communication, which aims to broaden the working bandwidth and high-frequency out-of-band rejection bandwidth of the antenna while ensuring omnidirectional and low-profile characteristics, and comprises a first dielectric plate and a second dielectric plate which are stacked up and down, and a first circular metal patch is printed on the upper surface of the first dielectric plate; the upper surface of the second dielectric plate is printed with a third circular metal patch, a first metal circular ring composed of N first arc bottom trapezoidal patches and a second metal circular ring composed of M second arc bottom trapezoidal patches, wherein the third circular metal patchis connected with the metal floor through N1 metallized via holes which are distributed in a circular mode. A metal floor is printed on the lower surface of the second dielectric plate, and a first split-ring resonator located at the projection position of the first arc bottom trapezoidal patch and a second split-ring resonator located at the projection position of the second arc bottom trapezoidal patch are etched on the metal floor.

Description

technical field [0001] The invention belongs to the technical field of antennas, and relates to a low-profile broadband omnidirectional filter antenna, in particular to a low-profile broadband omnidirectional filter antenna applied to unmanned aerial vehicle communications. Background technique [0002] In UAV communication, due to the limited space on the UAV and the existence of many antenna systems and other radio frequency modules operating in different frequency bands, the coupling between them will affect the performance of the communication system, so filter antennas are required to achieve inter-frequency decoupling . Filter antennas have both filtering and radiation functions, mainly including the following three categories: (1) co-designing the filter and the antenna feeding part, or simply cascading the filter and the traditional antenna through an impedance converter; (2) changing The feeding structure of the antenna, so as to realize the feeding and filtering z...

AI Technical Summary

Problems solved by technology

The antenna has good omnidirectionality and the profile height is 0.027λ 0 (λ 0 The wavelength corresponding to the central frequency point of the antenna), there are three resonance frequency points in the working frequency band, the working bandwidth is 3.55GHz-4.4GHz, the relative bandwidth is 19.5%, but it is still narrow, and the out-of-band at high frequency The suppression bandwidth is narrow, and the out-of-band suppression bandwidth exceeding 15dB is only 0.8GHz

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