The design and realisation of M.I.C. subassemblies on ferrite substrates

This paper describes the design and performance of three microwave integrated circuit subassemblies which employ ferrite substrates. They are: a stabilised X-band Gunn oscillator suitable for local oscillator applications; a Doppler intruder module operating at X-band and a non-degenerate parametric amplifier at X-band pumped at Q-band. The advantages of using a single ferrite substrate (i.e. maximum integration) for a single frequency unit such as the oscillator and Doppler unit are demonstrated. For a subassembly such as the parametric amplifier it is shown that there are serious limitations to using a single ferrite substrate and it is more satisfactory to use separate, butt jointed substrates.