Abstract
This letter presents the trade-off between size reduction and electrical performance of miniaturized branch line couplers using distributed capacitors placed in the inner open area of the hybrid. Based on single, double, and triple II-section approximations of the quarter wavelength transmission lines of a conventional design with high impedance lines and shunt metal-insulator-metal (MIM) capacitors, size reduction as well as electrical performance are compared both in simulation and experimentally. The miniaturized triple-section hybrid achieves similar bandwidth performance as the conventional 3 dB branch line hybrid coupler, but with a 61.2% smaller footprint. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1553–1556, 2010; Published online in Wiley InterScience (www.interscience. wiley.com). DOI 10.1002/mop.25273
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