3 band communication equipment

摘要

A three band antenna unit for reception of radio waves in the AM and FM bands and for reception and transmission of radio waves in the UHF band as well as its connection with filters and a communication equipment are disclosed. The antenna unit includes an upper, first element for reception and transmission of a radio wave in the UHF band and a lower, second element for reception of radio waves in the FM band, both connected to a mobile telephone. An AM band signal from the first element is transmitted to the lower, second element through an AM band pass filter. A radio wave signal from the lower, second element is transmitted to an AM/FM tuner through an AM/FM band pass filter. AM band radio wave signal received by the upper, first element which is used for reception and transmission of a radio wave in the UHF band is synthesized with the AM band radio wave signal received by the lower, second element which is used for reception of radio wave in the FM band before it is transmitted to the AM/FM tuner, which therefore exhibits a high AM band reception sensitivity.