COMPUTER-AIDED DESIGN OF BROADBAND SINGLE BALANCED WAVEGUIDE MIXER AT K-BAND

摘要

In this article, computer-aided design of a broadband single balanced waveguide mixer covering full K-band (18 to 26.5 GHz) is presented. Emphasis has been given on simple design approach of the mixer using commercially available CAD (computer-aided design) tools. The mixer circuit is implemented on suspended stripline etched on soft substrate that is integrated with RF (radio frequency) and LO (local oscillator) waveguides. Conversion loss of 6-8 dB with 8.5 GHz instantaneous IF (intermediate frequency) bandwidth has been achieved with +10 dBm LO power at 35 GHz and the RF swept from 18 to 26.5 GHz. A systematic design approach of the mixer is presented with its simulated and experimental results.