IEEE Transactions on Microwave Theory and Techniques · 1990 · 394 citations · 9 references
EngineeringElectrical EngineeringMicroelectronicsMicrowave EngineeringSemiconductor DevicesImpedance MatchingIntegrated Circuit DesignMicrowave Integrated CircuitsMicrowave Semiconductor DevicesMicrowave Transmission LinesRadio-frequency Integrated CircuitsAccuracyGaas Microwave Integrated CircuitsGaas Monolithic Microwave Integrated CircuitsMicrowave Integrated Circuit DesignMillimeter-wave Integrated CircuitsMonolithic Microwave Integrated CircuitsPlanar Microwave CircuitsRadio-frequency Integrated Circuit Design
A method of miniaturizing branch-line 90 degrees hybrids and 180 degrees rat-race hybrids is proposed. The method utilizes combinations of short high-impedance transmission lines and shunt lumped capacitors. The hybrids were fabricated on GaAs substrates and the validity and effectiveness of the method were confirmed through experiments at 25 GHz and 11 GHz. The fabricated hybrids demonstrate excellent design accuracy at high frequencies, with a circuit size that is more than 80% smaller than that of conventional hybrids. These hybrids are particularly suitable for uniplanar MMICs where necessary shunt connections are easily made.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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H.A. Wheeler · Proceedings of the IRE · 1942 · 749 citations
A New Class of Microstrip Directional Couplers
F.C. de Ronde · 1970 · 99 citations