Subharmonic image rejection and image enhancement mixer

Details Subharmonic image rejection and image enhancement mixer Subharmonic image rejection and image enhancement mixer

1994-02-09

1996-05-14

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

455327, H04B 126

Patent

active

055176879

ABSTRACT:
A subharmonic image rejection and image enhancement mixer for mixing millimeter wavelength signals using a low conversion loss technique is described. A local oscillator frequency from an external source is fed to a first subharmonic mixer and through a phase shifter to a second subharmonic mixer. The phase shifter delays the local oscillator signal by (90.degree.
), where n is the multiple of the subharmonic mixers and is greater than 1. The first and second subharmonic mixers mix the local oscillator frequency with an input signal, which includes a desired frequency and an image frequency, to produce an intermediate frequency having a desired component and an image component at a select phase. A 0.degree.-90.degree. hybrid separates and terminates the image component of the intermediate frequency. The input port that feeds the input signal to each subharmonic mixer is dimensioned so as to provide a virtual image short termination or an image short termination to a self-generated image signal from each subharmonic mixer, thereby decreasing the conversion loss of the frequency mixer.

REFERENCES:
patent: 3681697 (1972-08-01), Moroney
patent: 3939430 (1976-02-01), Dickens et al.
patent: 4457022 (1984-06-01), Dydyk
patent: 4553265 (1985-11-01), Clifton et al.
patent: 4607394 (1986-08-01), Nightingale
patent: 4955079 (1990-09-01), Connerney et al.

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