An antenna system of a continuous wave radar

The given work describes an antenna system of continuous wave decimeter radar. The transmitting and receiving antennae are cylindrical spirals with the oppositely directed windings, where the distance between the axes is comparable with the wavelength. The main antenna parameters have been experimentally determined. It is shown that the reception-transmission channel isolation coefficient is 75-80 dB in the frequency band ranging +18% relative to the central value.