ABSTRACT
As we have seen in Chapter 1, there are a couple of arguments, approving the design of semiconductor devices and circuits at millimetre waves in a form of quasi-optical constructions — multielement arrays. In the power sources multielement circuits make possible to spread the heat power flow through a big area and to avoid overheating of the semiconductor devices. In the imaging systems a small size of the antennas due to short wavelength results in the opportunity to have sufficient amount of the pixels from antenna-coupled detec tor array with the appropriate aperture size. The idea of multi-unit arrays is exploited also in the energy transmission systems, since both receiver and transducer parts of them are influenced with power limitations of semiconductor devices. In the telecommunication circuits antenna arrays provide a multibeam operation, simplify wave-feeding system, improve the reliability. Since the first publications [1,2] many works were dedicated to the problem of device integra tion with antennas and design of MMW circuits as multielement arrays.
