Wideband balun for wireless and RF application

Details Wideband balun for wireless and RF application Wideband balun for wireless and RF application

1999-02-25

2000-10-31

Bettendorf, Justin P.

Wave transmission lines and networks

Coupling networks

Balanced to unbalanced circuits

333 33, H01P 510

Patent

active

061408867

ABSTRACT:
A transmission line balun transformer for providing a single ended output signal from a pair of differential input signals includes two transmission line signal couplers. The couplers are individually designed to be relatively loosely coupled devices, i.e. having a coupling factor greater than 3 dB, but are coupled together with proper phase relationships so as to achieve a relatively tighter composite coupling characteristic in the order of 3 dB, thereby resulting in an increase in bandwidth.

REFERENCES:
patent: 3991390 (1976-11-01), Conroy
patent: 5774801 (1976-11-01), Li et al.
patent: 6018277 (2000-01-01), Vaisanen
IEEE Transactions on Parts, Hybrids, and Packaging, "Wiggly Phase Shifters and Directional Couplers for Radio-Frequency Hybrid-Microcircuit Applications", Dec., 1976, pp. 317-323.
Microwave Journal, "Optimization of TEM Mode Tapered Symmetrical Couplers", S. Seward et al, Dec., 1985, pp. 113-119.

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