Design of reconfigurable concurrent dual-band quarter-wave transformer with application of power combiner/divider

This paper presents the analysis and design of reconfigurable concurrent dual-band quarter-wave transformer using two single pole single throw Micro-Electro-Mechanical Switches. The transformer will behave as concurrent dual-band quarter-wave transmission line at 800 MHz and 1800 MHz, when both the switches are OFF; whereas, when the two switches are ON, the same quarter-wave transformer will reconfigure for concurrent dual-band operation at 900 MHz and 2100 MHz. Thus, this dual-band transformer can effectively cover operation at four frequencies while operating simultaneously at two bands for carrier aggregation applications. For validation, this transformer is used to implement reconfigurable concurrent dual-band Wilkinson power divider/combiner at these frequencies.