There are three types of microwave circuits which include microwave elements. The first is a discrete circuit; packagedDiode diodes/transistors mounted in coax and waveguideWaveguide assemblies. Second HybridHybrid MIC (Microwave Integrated CircuitMicrowave integrated circuit (MIC)); diodes/transistors and microstrip fabricated separately and then assembled. The third is MMIC (Monolithic Microwave Integrated Circuit); diodesDiode, transistors and microstrip fabricated simultaneously.