Vari-l Company, Inc.

Adams-russell Co., Inc.

Peter Will

Thomas A Milligan

A diode modulator type electrical mixer network has at least two hybrids of transmission line construction, interconnected by means of two sets of four or more diodes arranged in bridge circuit configurations. The interconnecting configuration provides a novel means of local oscillator injection that allows the mixer to operate in a mode that substantially reduces the mixer's susceptability to effects caused by reflective external source and load termination impedances differing from an ideal 50 ohm nonreflective condition.

Broadband doubly balanced mixer having improved termination

In a frequency translator for r-f television signals and the like there is provided an input frequency selective matching network to pass only r-f television signals in a predetermined range of about 50 to 300 MHz (vhf), a novel combination oscillator, impedance matching network, and mixer arranged for mixing incoming television signals from a cable or antenna with a preselected reference signal of a constant frequency generated by the oscillator to produce output signals from the mixer in a higher band of frequencies of about 500 to 750 MHz (uhf). An output frequency selective matching network passes only signals in said second band of frequencies to an output terminal. The impedance matching network provides a conjugate match for the output impedance of the oscillator and the input impedance of the mixer so as to inhibit the reflection of undesirable signal products from the mixer back to the oscillator and minimize power loss. The output frequency selective network and mixer arrangement do not require an active gain stage and an associated additional frequency selective matching networks in an input circuit ahead of the mixer.

Frequency translator

A broadband mixer has two separate tapered ground plane microstrip baluns associated with a first signal port and two separate tapered ground plane microstrip baluns associated with a second signal port together with a frequency converter or mixer portion coupled between the baluns associated with the first and second signal ports and a third signal port. The frequency converter or mixer portion is comprised of eight diodes in a double balanced bridge arrangement having two sets of terminals associated with the first and second signal ports, each of the terminals of said two sets being separated from each of the terminals of the third signal port by a diode to electrically isolate their respective signals. The baluns associated with the first and second signal ports provide for the transformation of unbalanced input signals to balanced signals at the frequency converting diodes. Another balun coupled between the diode bridge arrangement and the third signal port provides an unbalanced signal at the third signal port in response to balanced signals at the diodes from signal inputs at the first and second signal ports. The baluns associated with the first and second signal ports are cross-connected so that their respective signals do not pass through to the opposite signal port. The circuit is reversible in that a signal may be input to or output from any signal port.

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Denver, CO, United States of America

Peter Will