Mixer for use in a microwave system
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United States of America Patent
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-
Apr 28, 1987
Grant Date -
N/A
app pub date -
Sep 23, 1985
filing date -
Sep 23, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A novel mixer of good noise performance for operation at microwave frequencies (e.g. the 22 GHz communications band) is disclosed. The mixer comprises a waveguide to which signals and local oscillations are coupled, and from which the intermediate frequency output is derived. The principal circuitry is provided on a metallized substrate set within the waveguide in a 'finline' construction. The metallized substrate performs the essential functions of impedance matching the mixer to the source of signal and local oscillations, a bridge for isolating the signal port from local oscillations and for isolating the LO port from the signal, and means to adjust the application of signal and load to the mixer diodes for optimum signal conversion. The noise figure achieved is approximately 4 db at 22 GHz, and represents an improvement over known competitive designs.
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