Abstract
A band pass tunable RF filter is proposed by using Radio Frequency (RF) Microelectro Mechanical Systems (MEMS). The tunability is obtained by using capacitive MEMS switches that can be tuned within the bandwidth of 3.6 GHz to 4.4 GHz. The performance of the filter depends on geometry and location and types of the MEMS switches. Optimization has been done to achieve tunability by using 3-D high frequency electromagnetic simulator (HFSS).
Highlights
Modern wireless/satellite communication, radar, electronic warfare, and instrumentation, all demand tunable filters for flexible and adaptive operations over wide frequency range [1,2,3]
Due to losses and nonlinearity associated with p-n junctions and MOS structures and the complexity in biasing, microwave control devices based on these mechanisms may lack of appeal to current wireless communication applications, and investigations into tunable filters based on diodes and transistors have barely reported
The criteria of Radio Frequency (RF) filters with a higher performance, smaller size, lighter weight, lower cost, low loss, and high selectivity can be achieved by using RF Mechanical Systems (MEMS) technology
Summary
Modern wireless/satellite communication, radar, electronic warfare, and instrumentation, all demand tunable filters for flexible and adaptive operations over wide frequency range [1,2,3]. RF MEMS tunable filters of various tuning topologies [4,5,6,7], with much lower insertion loss (IL), nonlinearity and higher Q factor than semiconductor based devices, have been demonstrated as an enabling technology for low cost and high performance integrated military or commercial RF systems. These surface micromachined devices have the advantages of simple (electrostatic) tuning with ultra-low tuning power consumption, large bandwidth and capability of monolithic integration with active circuit. RF MEMS switches have been proposed to design a reconfigurable interdigital band pass filter and describe the optimization procedure to obtain tunable bandwidth
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