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Microwave Oscillator:

 

Gallium Arsenide:

    It is used in Outdoor unit of Microwave dishes. It is a form of Integrated circuit.

    You would have came across Integrated circuits made up of Silicon and Germanium. The drawback is that Silicon and Germanium will not work on Microwave frequencies.

    In order for an IC to work in Microwave frequency, compound of Gallium and Arsenic is used.

 Microwave dish for cellularMicrowave dish for cellular

    Real life example is available in this link.Kindly refer here for more info.