Radiation pattern reconfigurable antenna

A radar sensor comprising:

• a transmission antenna configured to transmit RF signals;
• a receiver antenna configured to receive RF signals;
• a radar transceiver configured to provide an RF output to the transmission antenna for transmission and to receive an RF input from the receiver antenna;
• and
• a control and signal processing circuit connected to the radar transceiver to process the RF input to detect objects;
• wherein at least one of the transmission antenna or the receiver antenna is a radiation pattern reconfigurable antenna that provides a first radiation pattern within a first frequency band and a second radiation pattern within a second frequency band, the radiation pattern reconfigurable antenna comprising:
• an RF input/output port;
• an RF divider/combiner connected to the RF input/output port, the RF divider/combiner having at least a first RF input/output and second RF input/output;
• an RF filter connected to the second RF input/output, the RF filter configured to filter RF signals in the first frequency band and to pass RF signals in the second frequency band;
• at least a first RF radiator connected, via a first delay line, to the first RF input/output of the RF divider/combiner, the first radiator configured to transmit or receive RF signals provided in both the first frequency band and the second frequency band;
• and
• at least a second RF radiator connected, via a second delay line, to the RF filter, the second RF radiator configured to transmit or receive RF signals passed by the RF filter in the second frequency band,
• the first delay line and the second delay line configured to control a phase of the signal between the first radiator and the second radiator if the signal is within the second frequency band.