Antenna for a mobile unit, tuned to the 27-28 MHz frequency, having the dimensions and the appearance of an antenna for a 400 MHz car phone

摘要

Device for giving an antenna operating in the 27-28 MHz frequency band the appearance of a 400 MHz radio telephone antenna. The invention relates to a device making it possible to give an antenna operating in the 27-28 MHz frequency band the appearance and the dimensions of a radio telephone antenna operating in much higher frequencies, 400 or 900 MHz for example. It consists of a miniature choke (6) wound round a mandrel (5) and inserted into the nut (2) of the base of the antenna. By insertion of a part (10) of the piece (8) into the piece (7), thus creating a capacitor, the antenna can also operate at two very different frequences. The device according to the invention is particularly intended for motorists using CB radio and wanting a very discreet antenna and those already having a radio telephone who wish to use CB radio without adding new antennae. IMAGE