Abstract: A microwave oscillator having a hollow conductor, an oscillation generator which is mounted on a heatsink and projects into the hollow conductor, and a printed circuit board having electronic components for supplying direct voltage to the oscillation generator. The printed circuit board or a metallic coating on, in, or under this printed circuit board forms one wall of the hollow conductor, and the oscillator including its heatsink is located in the printed circuit board.

Abstract: In a device for transmitting and receiving radar radiation, at least one patch antenna is provided as transmit and receive element, which is directly connected to at least one mixing element.

Abstract: A radar sensor emits microwave radiation and receives partial radiation reflected at objects within the sensor detection range, a plurality of antennas being provided for the transmission and reception in each case, and the transmission power of the outer antennas being lower than the transmission power of the inner antennas. This is accomplished by reducing the transmission power with the aid of couplers, the couplers advantageously being implementable as Wilkinson power splitters.

Abstract: A device for transmitting and receiving electromagnetic radiation includes separate antennas for transmitting and for receiving electromagnetic radiation and in which the lobes of the transmitting and receiving antennas are focused by a shared focusing arrangement.