Dual Function Mixer Circuit for Millimeter Wave Transceiver Applications

• Published in: Microwave and Millimeter-Wave Monolithic Circuits Vol. 85; no. 1; pp. 78 - 81
• Main Authors: Chu, A., Courtney, W.E., Mahoney, L.J., Manfra, M.J., Calawa, A.R.
• Format: Conference Proceeding
• Language: English
• Published: MTT007 1985
• Subjects: Capacitors; Coupling circuits; Insertion loss; Local oscillators; Microstrip filters; Millimeter wave circuits; Schottky diodes; Transceivers; Transmitters; Transmitting antennas
• DOI: 10.1109/MCS.1985.1113644

A monolithic mixer circuit capable of performing either a receiver or transmitter function has been fabricated. The mode of operation is determined by applying either forward bias or reverse bias to a pair of mixer diodes. The circuit integrates Schottky-barrier diodes, bias lines, Ta/sub 2/O/sub 5/ blocking and by-pass capacitors, a radial line stub filter and a microstrip branch-line coupler. For the receiver function the unit exhibits a conversion loss of 6.5 +- 0.5 dB from 34 to 36 GHz. For the transmitter function the circuit directs the signal from the local oscillator port to the antenna port with an insertion loss of approximately 2 dB at 33.5 GHz over a bandwidth of 1 GHz.