Abstract
This paper describes the design and fabrication of millimeter wave balanced mixer, using commercially available Schottky barrier beam lead diodes and planar circuit techniques. The design of RF, LO and IF matching circuits are described. The beam lead Schottky barrier diodes were subjected to test (before being bonded to mixer circuit) for their I-V characteristics and match paired for better AM noise cancellation and for optimum diode parasitic losses. The mixer circuit has been realized on 125 micron thick RT Duroid substrate involving symmetrical unilateral finline in E plane of a rectangular metal waveguide housing and suspended substrate strip line configuration, integrated on a single substrate. A conversion loss of 10.5 dB, noise figure of 8 dB (DSB) and RF to LO isolation better than 21 dB have been achieved with + 13 dBm LO power.
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