Printed circuit transformer

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

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333 26, 455330, H04B 126

Patent

active

050036220

ABSTRACT:
Circuits such as balanced diode mixers require balanced transformers. For ultrahigh frequency operation, a balanced transformer is formed as part of a printed circuit on a planar substrate of insulating material. The balanced transformer has a center-tapped winding formed by a loop of a strip transmission line having first and second coextensive elongated conductors disposed on the substrate. Preferably the first and second conductors are disposed adjacent each other on respective opposite sides of the substrate. At a first end portion of the strip transmission line, the second conductor is connected to a center tap, and at a second end portion of the strip transmission line, the first conductor is also connected to the center tap. For a balun transformer, the center tap is a ground plane provided by conductive regions disposed on the substrate. Preferably an unbalanced signal is fed into the transformer at a second winding including at least a third elongated conductor disposed on the substrate coextensive with the first and second conductors.

REFERENCES:
patent: 4193048 (1980-03-01), Nyhus
patent: 4302739 (1981-11-01), Hattford
patent: 4355421 (1982-10-01), Seely
patent: 4430758 (1984-02-01), Snyder
Radio Amateur's Handbook, American Radio Relay League (1969) pp. 349-351.
Hitachi HSM88AS & HSM88ASR Schottky Barrier Twin Diodes (Sep. 1, 1986) (2 pages).
Bert C. Henderson, "Mixers: Part 2 Theory and Technology," RF and Microwave Component Designer's Handbook, Watkins Johnson Company 1988/89, pp. 759-756.

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