Patent ID: 6278869
Filing Date: 2001-08-21
Classification: H04B

Abstract:
A radio system for remote control operation in a stationary vehicle by means of a high frequency radio transmission in a one meter wavelength band comprisinga radio receiver (1) located in the vehicle;a radio transmitter outside of the vehicle for transmitting a predetermined radio signal for remote control operation in a predetermined radio channel designed to be received only by the radio receiver located in the vehicle;at least two receiving antennas (2a,2b) in the vehicle (5);means for decoupling said at least two receiving antennas (2a,2b) for diversity-type operation in said frequency band of said radio channel, said means for decoupling including a selection circuit (3) connected with said at least two receiving antennas (2a,2b), said selection circuit (3) including switching means for connecting respective ones of said at least two receiving antennas (2a,2b) one at a time to said receiver (1) when said receiver (1) is tuned to said radio channel and put in a ready mode and a clock (4) including means for setting predetermined time intervals at which said switching means operates to switch said antennas and means for controlling said selection circuit (3) according to said predetermined time intervals;whereby respective ones of said at least two antennas (2a,2b) are sequentially connected with said receiver one after the other at said predetermined time intervals required for detection of the radio signal designed to be received by said radio receiver in said radio channel.