Abstract
This paper presents the design and performance of a 94 GHz crossbar mixer using chip diodes in crossbar configuration. The mixer has been designed in suspended stripline configuration on 2 mil fused quartz substrate. Co-simulation between Agilent Advance Design System (ADS) and CST Microwave studio is used to simulate and optimize the mixer circuit. The conversion loss of this crossbar mixer with ~10 dBm of LO power over RF bandwidth (89 to 93.8 GHz) with LO frequency at 94 GHz has been measured. Measurement results show minimum conversion loss of the order of 8 dB and achieved LO to RF isolation was greater than 26 dB.
Highlights
Mixer is an essential component of almost all receivers used in communication, radar and radio applications
Millimeter wave mixers are generally designed in waveguide, suspended stripline, fin-line or combination of these lines
2) Design and simulation of LO side broadside coupler is done in CST microwave studio and 2 × 2 scattering matrix file is exported to Advance Design System (ADS) circuit simulator
Summary
Mixer is an essential component of almost all receivers used in communication, radar and radio applications. The mixer generates an output spectrum, consisting of sum, difference and harmonics of the individual frequencies present at its input. The desired frequency can be filtered at output. Millimeter wave mixers are generally designed in waveguide, suspended stripline, fin-line or combination of these lines. After going through many literatures, it has been found that suspended stripline has been successfully used to design mixer at 94 GHz [1]-[3]. Crossbar configuration of the mixer is well proven technology at this frequency
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