Coaxial series-parallel feed omnidirectional biconical dipole sleeve antenna

Abstract

The invention relates to a coaxial series-parallel feed omnidirectional biconical dipole sleeve antenna, which belongs to the technical direction of antenna microwaves, consists of a biconical dipole sleeve antenna unit and a coaxial series-parallel feed network, and mainly comprises a biconical dipole, a metal sleeve and the coaxial series-parallel feed network, wherein the radiating body gradient structure of the biconical dipole antenna unit can enable the radiating body gradient structure to obtain better impedance matching with a free space; the coaxial metal sleeve outside the radiating body can further broaden the working bandwidth of the antenna unit; and the biconical dipole antenna units are in omnidirectional radiation in the horizontal direction, and a coaxial series-parallel feed network is adopted to form an array in the vertical direction, so that the high-gain performance of the antenna is achieved. The coaxial series-parallel feed network is composed of a linear gradient impedance conversion section and a two-stage coaxial power divider. The coaxial series-parallel feed network has no influence on the direction of a vertical plane directional diagram of the antenna, is simple in structure and easy to realize, and can be used as a structural support of an omnidirectional antenna.

Description

technical field [0001] The invention belongs to the antenna microwave technology direction in the field of communication and radar technology. Background technique [0002] Omnidirectional antennas are widely used in mobile communications, passive reconnaissance, electronic countermeasures and other fields due to their 360° coverage in the horizontal plane. Different application fields have different requirements for the working bandwidth, gain, polarization mode, and structural form of the omnidirectional antenna. At present, conventional omnidirectional antennas are mainly divided into two categories: one is through the improvement of monopole antennas, such as biconical antennas, disc cone antennas and other single antennas, and the polarization form is mostly vertical polarization; the other is based on dipole antennas. The sub-antenna units form an array to realize horizontal or dual polarization. There are generally two implementation forms for omnidirectional antenn...

AI Technical Summary

Problems solved by technology

Antenna units are generally fed in the form of series feed or parallel feed, which have their own advantages and disadvantages: theoretically, the parallel feed of array elements can ensure the consistency of the amplitude and phase of each unit, but the structure of the feed part is complex and easily affected The omnidirectional performance of the antenna in the horizontal plane pattern; the structure of the series feed is simple and easy to implement. The phase difference of each unit in the array will change with the frequency, so that the vertical pattern of the omnidirectional antenna will be scanned, resulting in a gain that meets the gain requirements. The operating frequency band is narrowed

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