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Abstract

A wide band microwave subharmonic mixer includes a signal divider, first and second balanced varistor frequency converters, and a signal combining and dividing circuit. A local oscillator signal is applied to the signal divider, which divides the local oscillator signal into first and second signals. The first signal is applied to the first frequency converter via a coplanar transmission line, while the second signal is applied to the second frequency converter via another coplanar transmission line. The first and second frequency converters each comprise a pair of diodes. Each pair of diodes may be externally polarized by a dc polarization current. The signal combining and dividing circuit receives a microwave signal, and couples the microwave signal to the first and second frequency converters via slotted transmission lines. The first and second frequency converters produce an intermediate frequency signal which is outputted via the frequency combining and dividing circuit. Flanking ground conductors of the coplanar transmission lines may be short-circuited at a predetermined distance from the pairs of diodes.

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First Claim