IEEE Microwave and Wireless Components Letters · 2007 · 199 citations · 6 references
EngineeringElectrical EngineeringAntennasCircuit TheoryMicrowave EngineeringCoupled CircuitsImpedance MatchingMicrostrip CircuitsMicrowave Integrated CircuitsMicrowave Transmission LinesTransmission LinesBranch-line CouplersCharacteristic ImpedanceCoupled-line CouplersDual-band Antenna DesignDual-band CouplersMicrostrip CouplersMicrowave Coupler Design
This letter presents a stub tapped branch-line coupler for dual-band applications. In the new design, a tapped stub is used to realize 90deg phase change at two frequencies. Both the characteristic impedance and the length of the proposed branch lines are adjusted accordingly compared with the conventional structure. Explicit design equations are derived using the ABCD-matrix. To verify the design concept, a microstrip coupler operating at 0.9 and 2GHz is fabricated and measured on a Rogers' RO4003 board
6
Kuang‐Wei Cheng, Fai-Leung Wong · IEEE Transactions on Microwave Theory and Techniques · 2004 · 299 citations