Abstract: A single transmission line couples multiple different antennas to corresponding radios using a low-loss signal selector made from a directional radio frequency coupler and a bandpass filter. A combiner receives signals from the antennas and combines those signals onto the one transmission line. The multiple, different-frequency signals on the transmission line are provided to a directional coupler having two outputs. One of the outputs from the directional coupler is routed to a first band pass filter having a pass band corresponding to a radio frequency required by a particular radio.

Abstract: A single transmission line couples multiple different antennas to corresponding radios using a low-loss signal selector made from a directional radio frequency coupler and a bandpass filter. A combiner receives signals from the antennas and combines those signals onto the one transmission line. The multiple, different-frequency signals on the transmission line are provided to a directional coupler having two outputs. One of the outputs from the directional coupler is routed to a first band pass filter having a pass band corresponding to a radio frequency required by a particular radio.

Abstract: A person, animal, or object in the back seat of a motor vehicle can be presumed to have been inadvertently left there if a back seat access device such as a rear door or seatback of a front seat has been used, followed by the closure of a door lock and not followed by a second usage of the back seat access device. When a person, animal, or object is determined to have been inadvertently locked in the vehicle, an alarm is automatically generated by the vehicle, which notifies the driver, by-standers, and/or an emergency service provider.