TUNABLE FILTERS

Main parameters of tunable filter

Figure of merit of a filter

	inclusion coefficient of the varactor in the   resonator
	commutation quality factor of the varactor for tunable filters
	commutation quality factor of the varactor for tunable filters
	unloaded Q-factor of the resonator with lossless varactor

Examples of the devices

L/S band ferroelectric 3-cascade digital-analog phase shifter

Ku-band 4-pole tunable filter based on waveguide-dielectric resonators

S-band 2-pole tunable filter on the base of planar ring resonators

Tunable two-pole dielectric resonator filter with piezoelectric actuator