Adaptable concurrent dual-band symmetrical stubbed T-junction power splitter

A continuously tunable, concurrent dual-band stubbed T-junction power splitter is reported for mobile communication bands of GSM-900 and DCS-1800. Simultaneous dual frequency tuning is exhibited by the design through use of a variable capacitor that changes effective electrical length of open-ended stub in the structure. The fabricated hybrid microwave integrated circuit (HMIC) for the proposed design exhibits dual-frequency tunability of 16.8% and 6.8% in the first and the second bands, respectively. Due to symmetrical architecture, the prototype maintains equal power division, between its two output ports, throughout the tunable range, i.e., the input-to-output forward transmission coefficient is -3dB for each output port.