PURPOSE: To reduce temperature rise at high-frequency circuit parts and to obtain a small cooling system by providing the foresaver of an input high- frequency circuit part and the backsaver of an adjoining IF with specific times the backsaver of an output high-frequency circuit part and the foresaver of an adjoining IF corresponding to microwave loss. ;CONSTITUTION: Input part foresaver 4 and intermediate part backsaver 7 having low microwave loss are reduced corresponding to microwave loss to reduce tire projected parts of high-frequency circuit parts. As a result. turbulence of cooling air 8 and pressure loss are reduced to efficiently perform cooling at the high-frequency circuit parts and a collector part, resulting in controlling temperature rise at the high-frequency circuit parts. Namely, the foresaver of the input high-frequency circuit 1 and the backsaver of an adjoining intermediate high-frequency circuit part are provided with, for example, 0.5-0.8 times the foresaver of an intermediate high-frequency part faced to the above intermediate high-frequency circuit part. Thus, the projected parts of the saver parts are reduced to reduce the turbulence of cooling air and pressure loss, preventing temperature rise at the high-frequency circuit parts.;COPYRIGHT: (C)1993,JPO&Japio
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