Millimetric wavelength components and coherent radar systems

The construction of radar systems operating at millimetric and sub-millimetric wavelengths has necessitated the design and manufacture of a wide range of new microwave components. Manufacturing techniques have been developed for the production of components to operate in the frequency range from 30 GHz to 325 GHz using the fundamental mode in rectangular waveguide. Descriptions of some of these components and techniques are given, together with details of other higher frequency open structure and non-fundamental mode components. Planar millimetric circuitry, produced by photolithography, has been developed for use in harsh environments and the characteristics of a sub-system constructed in this manner are described. Finally, both the design and operation of two millimetric coherent radar systems are discussed and some details of their performance are given.