Short wave broadband horizontal doublet antenna of base station

Abstract

The invention relates to a linear antenna applied to shortwave communication, in particular to a base station shortwave broadband horizontal-dipole antenna. The antenna comprises two radiation arms, a transmission line transformer and a supporting pole tower. The base station shortwave broadband horizontal-dipole antenna is characterized in that the two radiation arms are folded into a V shape to form an included angle Alpha; the two radiation arms are separated by an insulating board; and two output ports of the transmission line transformer are respectively connected with the two radiation arms. The invention has the advantages that firstly, the antenna has simple structure, convenient erection and small occupied area, and is suitable for beam communication within 3,500km in small and medium-sized base stations; secondly, the antenna has excellent standing wave ratio bandwidth, the working frequency band is 6 to 30 MHz, the standing wave ratio of the antenna does not exceed 2.5 to the maximum and is smaller than 2 within the working frequency band of 7 to 30MHz, and the antenna is suitable for matching a wideband transmitter in use; thirdly, the average power gain of the antenna reaches 13 dBi, and the antenna is suitable for middle and long-distance communication.

Description

technical field [0001] The invention relates to a wire antenna applied to short-wave communication, in particular to a short-wave broadband horizontal dipole antenna of a base station. Background technique [0002] At present, there are mainly two types of dipole antennas and logarithmic periodic antennas used for short-wave medium and long distance (500-3500km range) communication. The dipole antenna composed of a single thin wire has a very narrow bandwidth and cannot be used for broadband communication. Tuning-free full-band broadband operation, frequency hopping, spread spectrum, adaptive frequency selection, dynamic frequency control and other effective anti-jamming communication methods cannot be implemented. The currently widely used loaded dipole antenna can effectively expand the impedance bandwidth of the antenna, but reduces the radiation efficiency of the antenna, especially the low frequency end efficiency is very low, resulting in a low gain of the antenna. Un...

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Problems solved by technology

[0002] At present, there are mainly two types of dipole antennas and logarithmic periodic antennas for short-wave medium and long-distance (500-3500km) communications. The dipole antenna composed of a single thin wire has a narrow bandwidth and cannot be used for broadband communications. Tuning-free full-band broadband work, effective anti-interference communication methods such as frequency hopping, spread spectrum, adaptive frequency selection, and dynamic frequency management cannot be implemented

The currently widely used loaded dipole antenna can effectively expand the impedance bandwidth of the antenna, but reduces the radiation efficiency of the antenna, especially the low frequency end efficiency is very low, resulting in a low gain of the antenna

Unloaded broadband dipole antennas such as biconical antennas have higher radiation efficiency, but when the operating frequency of the dipole antenna changes from low to high, the main lobe of the pattern is continuously split, and the antenna radiation is symmetrical before and after, so the power gain of the antenna Still not high, and the splitting of the main lobe leads to changes in the direction of the main beam, which is unfavorable for communications in fixed directions or fixed sectors

The logarithmic periodic antenna has a fixed beam and high gain, but the antenna structure is complex and occupies a large area, so it is not suitable for small base stations or a large number of base stations.

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