Broadband horizontally polarized omnidirectional antenna

Abstract

The invention discloses a broadband horizontally polarized omnidirectional antenna, which comprises a circular dielectric substrate, a broadband microstrip feed network printed at the upper part of the dielectric substrate and a metal grounding plate printed at the lower part of the dielectric substrate, wherein gaps are etched in the metal grounding plate; an SMA connector is arranged on the metal grounding plate at the lower part of the center of the dielectric substrate; two groups of crossed gaps which are arranged at intervals, are the same in size, are alternately arranged along the circumference and are distributed in a central symmetry manner are etched in the circumference surface of the metal grounding plate; a power divider is arranged at the center of the broadband microstrip feed network; impedance transformers which extend along the center of the power divider are distributed along the circumference surface of the broadband microstrip feed network in a radial manner; andmicrostrip broadband baluns extending at a right angle are arranged at the end parts of the impedance transformers. According to the broadband horizontally polarized omnidirectional antenna, the current path is changed, the volume of the antenna is reduced, the impedance bandwidth of the antenna is expanded, the out-of-roundness of a horizontal diagram is reduced, impedance matching in a working band is improved and the efficiency of the antenna is improved. The broadband horizontally polarized omnidirectional antenna is simple and compact in structure, convenient to process and low in cost.

Description

technical field [0001] The invention belongs to the technical field of antennas, in particular to a broadband horizontally polarized omnidirectional printed antenna covering 1.7GHz-2.7GHz. Background technique [0002] A horizontally polarized antenna refers to an antenna whose antenna polarization direction is horizontal. The omnidirectional antenna can achieve uniform radiation within the range of 360° azimuth angle, so the beam coverage is large, and it is widely used in mobile communication, radio frequency identification and other fields. The uniformity of the omnidirectional antenna radiating energy in different directions is evaluated by the out-of-roundness of the omnidirectional antenna's horizontal pattern. Reducing the out-of-roundness of the omni-directional antenna is conducive to uniform coverage of uniform signals. [0003] Horizontally polarized omnidirectional antennas usually use multiple horizontally polarized antenna radiating elements to form a circula...

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Problems solved by technology

[0006] In view of the deficiencies in the above-mentioned existing antenna design, the purpose of the present invention is to provide a compact, horizontally polarized, omnidirectional, broadband printed antenna, aiming to solve the problem of complex structure, large volume, high profile, Problems of narrow bandwidth and large out-of-roundness of the horizontal omnidirectional pattern

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