Wave transmission lines and networks – Coupling networks – Balanced to unbalanced circuits
Patent
1993-12-07
1995-10-03
Gensler, Paul
Wave transmission lines and networks
Coupling networks
Balanced to unbalanced circuits
333116, H01P 510
Patent
active
054555450
ABSTRACT:
A microwave balun is constructed by combining a four-transmission-line branch-line coupler with a single-transmission-line delay element. This construction results in a simplified, compact arrangement for combining first and second signals applied to respective first and second ports, phase shifted by 180.degree., and providing the combined signal at a third port. The balun is a reciprocal device and may be operated in reverse with a signal applied to the third port to obtain outputs at the first and second ports.
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Pozar, Microwave Engineering, Section 8.5: The Quadrature (90.degree.) Hybrid, pp. 411-415; Section 8.8: The 180.degree. Hybrid, pp. 435-440.
Reed et al., "A Method of Analysis of Symmetrical Four-Port Networks", IRE Transaction on Microwave Theory and Techniques, Oct. 1956, pp. 246-252.
Mayer et al., "Novel Branchline Couplers for Monolithic Microwave Integrated Circuits", Technische Universitat Hamburg-Harburg, AB Hochfrequenztechnik, pp. 1157-1162.
Khilla, "New Tunable Branch Line Coupler", Applied Microwave, Spring 1991, pp. 98-102 and 107-108 and 109-110.
Gensler Paul
Kraus Robert J.
Philips Electronics North America Corporation
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