Patent ID: 6246866
Filing Date: 2001-06-12
Classification: H04B

Abstract:
A dual band receiver, comprising:an antenna for receiving radio frequency (RF) signals, said RF signals consisting of the group of ultra-high frequency (UHF) and very-high frequency (VHF) signals;a receiver front end circuit coupled to the antenna for receiving the UHF signals and generating shaped UHF signals;a direct conversion receiver having a broadband input for receiving the shaped UHF signals from the front end receiver;a loading/isolator circuit having an input and an output, the input being coupled to the antenna, the loading/isolator circuit operating as an isolator to the UHF signals and presenting a predetermined impedance to the VHF signals;first and second selectable matching circuits coupled between the output of the loading/isolator circuit and the broad band input of the direct conversion receiver, the matching circuit providing an open to the UHF signals and a predetermined match for the VHF signals;first and second selectable voltage controlled oscillator (VCO) circuits coupled to the direct conversion receiver; anda controller for controlling the first and second selectable matching circuits and the first and second selectable VCO circuits.