Working mode of frequency-adjustable ground loop antenna

Abstract

The invention discloses a working mode of a frequency-adjustable grounding ring antenna, which comprises a main radiator, a grounding plate, a variable capacitor, a matching network and a connecting wire, wherein the main radiator is annular and is fixed above the grounding plate, two ends of one connecting wire are respectively connected with the grounding plate and an outer skin of a coaxial line at a feeding point, two ends of another connecting wire are respectively connected with the grounding plate and the end of main radiator, the one end of the matching network is connected with the inner core of the coaxial line at the feed point through the connecting wire, and the other end of the matching network is connected with the initial end of the main radiator through the connecting wire. According to the working mode of the frequency-adjustable ground loop antenna, the requirements for the voltage standing-wave ratio and the bandwidth are met, meanwhile, the height of the antenna can be greatly reduced, the size of the antenna is reduced, the antenna is of a planar structure and can be well conformal with a carrier, engineering installation is facilitated, meanwhile, lossless variable capacitor loading is adopted for the antenna, and the performance of the antenna can be adjusted at any time; radiation efficiency is high.

Description

technical field [0001] The invention relates to the technical field of loop antennas, in particular to a working mode of a frequency-tunable ground loop antenna. Background technique [0002] The loop antenna works in a certain frequency band similar to the short-wave dipole antenna placed vertically on the ground. The dipole antenna has a simple structure and generally adopts the form of center feed or bottom feed. It is easier to obtain wider impedance bandwidth and pattern bandwidth. The beam has Omnidirectional, therefore, dipole antennas are widely used in short-wave communications such as ships. [0003] In the structure of the existing dipole antenna, in order to obtain relatively smooth input impedance characteristics with the change of the operating wavelength, it is necessary to carry out concentrated impedance loading, resulting in a decrease in antenna efficiency and low power withstand, and the existing dipole antenna is used to widen the bandwidth. Simply incr...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a frequency-adjustable ground loop antenna working mode to solve the problem that in the structure of the existing dipole antenna proposed in the above-mentioned background technology, in order to obtain relatively gentle input impedance characteristics with the change of the working wavelength, it is necessary to concentrate Impedance loading reduces the efficiency of the antenna and can withstand low power, and the existing dipole antenna simply increases the diameter of the radiator in order to widen the bandwidth, resulting in an excessively large antenna diameter, which cannot be miniaturized. In addition, in order to achieve the design of the dipole antenna Target requirements, the height is generally a few meters or even more than ten meters, it is difficult to conform to the carrier, so it cannot meet the development requirements of the miniaturization of short-wave antennas

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