2014 · 17 citations · 1 references
EngineeringElectrical EngineeringElectromagneticsMicroelectronicsMicrowave EngineeringElectromagnetic CompatibilityImpedance MatchingMicrowave Integrated CircuitsMicrowave Passive ComponentsMicrowave System DesignRadio-frequency Integrated CircuitsEquivalent Circuit AnalysisEquivalent Circuit ModelingFerromagnetic ResonanceInsertion LossInsertion Loss ReductionIsolationMicrowave Circulator DesignReconfigurable Rf Front Ends
A novel miniaturized broadband circulator for reconfigurable mobile handsets has been successfully developed. The circulator operating in a weak magnetic field below ferromagnetic resonance is derived by analyzing the equivalent circuit. The operating theory of the circulator has been confirmed by using the perturbation theory. The usable isolation band could be expanded to 1.71GHz to 2.17GHz, which is a very small sized 1.2 × 1.0 × H0.5 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> such as 1/25 compared with the conventional one, Core-Circulator is realized. The developed circulator keeps characteristics as the insertion loss of 1.1dB maximum and the TX-RX isolation of 21dB minimum which have achieved the requirements of the tunable RF front-end.
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