Tunable RF filters have significant utility in software-defined radio applications. Often, these applications require wideband frequency coverage that may differ greatly from frequency coverage used in civilian telecommunication systems. Most commonly, tuning response is a product of changes made to capacitors and inductors in the resonators of...

Electronic communication systems widely use bandpass filters. In conventional radio transceivers with fixed band(s) of operation, bandpass filters operate for a predetermined center frequency and bandwidth. Fixed RF filtration is usually realized using lumped element L-C resonators, transmission-line and waveguide resonators, ceramic resonators,...