Multi-octave bandwidth balun

Details Multi-octave bandwidth balun Multi-octave bandwidth balun

1991-04-19

1992-12-15

Gensler, Paul

Wave transmission lines and networks

Coupling networks

Balanced to unbalanced circuits

333161, H01P 510

Patent

active

051720825

ABSTRACT:
A balun structure including a dielectric substrate having top and bottom surfaces on which are formed a splitter/combiner, a reference transmission line of length A and substantially constant characteristic impedance, and an inverting transmission line of length A and substantially constant characteristic impedance. The inverting transmission line in particular includes a first tapered planar section disposed on the top surface of the substrate and transitioning along its length from a narrow width to a wide width, and a second tapered planar section disposed on the bottom surface of the substrate and transitioning along its length from a wide width to a narrow width, such that the first and second tapered planar sections are rotated mirror images of each other.

REFERENCES:
patent: 3523260 (1970-08-01), Gunshinen et al.
patent: 3678418 (1972-07-01), Woodward
patent: 4460877 (1984-07-01), Sterns
patent: 4725792 (1988-02-01), Lampe, Jr.
The Balun Family, H. Shuhao, Microwave Journal, Sep. 1987, pp. 227-229.
"Broadband Stipline Balun Using Quadrature Couplers," S. Walker, IEEE Transactions on Microwave Theory and Techniques, Feb. 1968, pp. 132-133.

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