Abstract: Disclosed is a microwave transistor mounting structure which comprises a chassis formed with raised portions, a substrate formed with a hole, and a microwave transistor, the raised portions of the chassis being engaged with the hole of the substrate, the grounding terminals of the microwave transistor being mounted on the raised portions, and the other terminals of the microwave transistor being mounted on the substrate.

Abstract: A transformer is disclosed. The transformer consists essentially of first and second conductors, each having at least three overlap portions, terminals at one end each of the overlap portions and a connecting portion for connecting the other end of each of the overlap portion; an insulating member interposed between the first and second conductors, thereby forming an electromagnetic coupling; and two cores mode of a magnetic substance, at least one of the cores having three grooves; the overlap portions of the first and second conductors being placed in the grooves of the core while being electrically insulated from one another by the insulating member; the two cores being bonded to each other with the overlap portions between them.

Abstract: An assembly structure of a high frequency circuit apparatus including at least one first high frequency circuit block; a metallic chassis on which said first high frequency circuit block is disposed; a second high frequency block formed by placing a high frequency circuit element inside a metallic case having one of its surfaces opened; and a shield case having one of its surfaces opened and divided into compartments by shield plates shielding said high frequency circuit blocks from one another; said second high frequency circuit block being fitted to said metallic chassis in such a fashion that the open surface thereof is sealed by said metallic chassis; said shield case being fitted to said metallic chassis in such a fashion that said compartments thereof separate said high frequency circuit blocks from one another.