Ultra-wideband high gain horizontally polarized omni-directional antenna

Abstract

An ultra-wideband high gain horizontally polarized omni-directional antenna is provided. An Alford loop arm of a full-wave half-wave hybrid oscillator is constructed. The complete Alford loop antennais constructed by Alford loop arm and feeds the central coaxial line of the Alford loop antenna. A pair of half-wave oscillator elements with short ends are added to the inner side of full-wave oscillator of each arm of the circular array and the middle part of the circular array. A pair of open-circuit branches are arranged on the outside of the half-wave oscillator. The array is fed by paralleltwo-conductor transmission lines. The transmission lines are composed of unequal length and width conversion segments. The upper and lower two-conductors of the outermost conversion segment are offsetfrom left to right rather than coincide with each other in the center. An arc notch is made on the outside of the middle of the full-wave vibrator. By optimizing the geometrical parameters of the full-wave oscillator, the half-wave oscillator, the open-circuit branch and the parallel feed line, the invention realizes the ultra-wide bandwidth, the higher gain, the good horizontal omni-directionality, the high efficiency, the high power capacity, the simple feeding design, the smaller diameter and the ultra-low profile of the Alford loop antenna unit.

Description

technical field [0001] The invention relates to wireless communication antenna equipment and technology, specifically an ultra-broadband high-gain horizontally polarized omnidirectional antenna. Background technique [0002] Horizontally polarized omnidirectional antenna is an important antenna type in radio engineering. It has a wide range of application requirements. For example, H / V orthogonal dual High capacity requirements. So far, all kinds of horizontally polarized omnidirectional antennas that have been invented are almost based on the loop antenna theory, that is, the electric small loop antenna and the electric large Alford loop antenna. The former is the earliest horizontally polarized omnidirectional antenna invented, but because the circumference is much smaller than the working wavelength, the current is equal in amplitude and in phase everywhere, its gain is very low, the bandwidth is very narrow, and the efficiency is very poor, so it is often used as an act...

AI Technical Summary

Problems solved by technology

However, the fly in the ointment is that the horizontal out-of-roundness of the horizontally polarized omnidirectional array of the full-wave vibrator is poor

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