Transmitting and receiving system for signals on several frequency domains, for vehicle security system, comprises noise figure and ultra high-frequency circuits having suitable circuits working with common antenna

摘要

The system includes a noise figure (NF) circuit (2) for receiving and transmitting a signal on the first frequency domain. An ultra high-frequency (UHF) circuit (3) transmits and receives a signal on the second frequency domain. The NF and UHF circuits have suitable circuits (11,21) that work with a common antenna (20). An Independent claim is also included for the transmission and receiving method of signals on several frequency domains.