Patent ID: 7130606

Claim:
An integrated semiconductor mixer, comprising: a substrate ( 10 ); a radio-frequency balun ( 12 ) disposed on the substrate ( 10 ); a local oscillator balun ( 14 ) disposed on the substrate ( 10 ); an intermediate-frequency port ( 16 ) disposed on the substrate ( 10 ); and a mixer diode array ( 18 ), disposed on the substrate ( 10 ), that communicates with the radio-frequency balun ( 12 ), the local oscillator balun ( 14 ), and the intermediate-frequency port ( 16 ), wherein the radio-frequency balun ( 12 ) is shielded from the local oscillator balun ( 14 ) by plated holes ( 20 ), wherein single-row plated holes ( 20 ) communicate with one another by means of resistors ( 26 ).