Planar magic-tee double balanced mixer

Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion

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Details

455330, 455333, 333121, H04B 126, H01P 520

Patent

active

054288398

ABSTRACT:
A broad bandwidth double balanced mixer with all circuitry contained on a single MMIC die is disclosed using planar magic tee hybrids to greatly reduce component quantity and die area. The hybrids comprise a Lange coupler followed by a capacitor and a quarter-wavelength transmission line on the direct path, in conjunction with a half-wavelength transmission line on the coupled path. The hybrid is essentially a planar realization of a magic tee, producing two equal magnitude outputs that are substantially 180 degrees separated in phase, with the coupled input terminated in 50 ohms. The mixer topology is a ring configured diode quad with two magic tee's at the RF and LO ports and a Wilkinson power divider at the IF port.

REFERENCES:
patent: 4578652 (1986-03-01), Sterns
patent: 4603435 (1986-07-01), Butler
patent: 4675911 (1987-06-01), Sokolov et al.
patent: 4978933 (1990-12-01), Marconi
patent: 4992761 (1991-02-01), Seely et al.
patent: 5006811 (1991-04-01), Kruger
patent: 5023576 (1991-06-01), Staudinger et al.
patent: 5045821 (1991-09-01), Staudinger et al.
patent: 5063365 (1991-11-01), Cappucci
patent: 5142697 (1992-08-01), Podvin
patent: 5303418 (1994-04-01), Staudinger et al.
Ogawa et al, "K-Band Integrated Double-Balanced Mixer", IEEE Transactions on Microwave Theory & Techniques, vol. MTT-28, No. 3, Mar. 1980.
"Double-Arrow 180.degree. Hybrid Covers 1 to 18 GHz" by Krytar, Sunnyvale, Calif. from Microwave Journal, Mar. 1987.

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