Very high frequency (VHF) band communication short antenna

Abstract

The invention relates to a very high frequency (VHF) band communication short antenna, which solves the problems of overlong length, inconvenience in packaging, transportation and use, non-ideal electrical performance, low gain, large standing wave and narrow frequency band of an antenna of VHF communication equipment in the prior art. The VHF band communication short antenna comprises a cable and an oscillator, wherein the cable is provided with an inner conductor and an outer conductor; the oscillator is electrically connected with the inner conductor of the cable through a matching network; a choking sleeve electrically connected with the outer conductor of the cable is arranged at the outer part of the cable; a plurality of spokes are arranged at the lower end of the choking sleeve; and the oscillator is in a helical structure. The structures of the normal direction radiated short helical radiation oscillator, the feed choking sleeve and the umbrella rib-shaped spokes are integrated into the VHF band communication short antenna, so the height of the antenna is reduced, and the packaging, the transportation and the use are facilitated; and meanwhile, the antenna has the advantages of high gain, small standing wave and wide frequency band.

Description

technical field [0001] The invention relates to an antenna, in particular to a VHF frequency band communication short antenna with short length, small volume, high gain, small standing wave and advantages in frequency bandwidth. Background technique [0002] The size of the antenna of a wireless communication device is generally related to the wavelength of the working frequency band. If the size is to be reduced, the electrical performance will be greatly affected. The wavelength of the VHF frequency band is several meters, so the length of the transceiver antenna used for VHF frequency band fixed or mobile communication stations is usually more than 1 meter, and the antenna vibrator is generally a slender linear structure, which is too different from the equipment and is not convenient for transportation. And use; In addition, the usual linear (monopole) antenna has a narrow operating frequency range, low gain, standing wave ratio, and unsatisfactory electrical performance...

AI Technical Summary

Problems solved by technology

[0003] The present invention mainly solves the problem that the antenna length of VHF communication equipment in the prior art is too long, it is inconvenient to pack, transport and use, and the electrical performance is not ideal. VHF band communication short antenna

[0004] Another object of the present invention is to solve the problems of low gain, large standing wave and narrow frequency band of the existing common VHF communication antenna, and to provide a short helical radiation vibrator for normal radiation, a feed choke sleeve and an umbrella-shaped The spoke structure is integrated, and it has the advantages of high gain, small standing wave and wide frequency bandwidth. It is a short antenna for VHF frequency band communication. It is especially suitable for communication stations and vehicle and ship mobile applications that require high electrical performance indicators of the antenna.

Images