Title :
Analog tuning of compact varactor-loaded combline filters in substrate integrated waveguide
Author :
Sirci, Stefano ; Martinez, Jorge D. ; Taroncher, M. ; Boria, Vicente E.
Author_Institution :
iTEAM, Univ. Politec. de Valencia, Valencia, Spain
Abstract :
The design, fabrication and measurement of continuously tunable filters in single-layer SIW technology is presented in this paper. The filters are based on coupled coaxial resonators embedded into the dielectric and conveniently loaded with GaAs varactors. Firstly, a 2-pole filter demonstrator has been fabricated on a low-cost substrate showing a tunable centre frequency between 2.64 - 2.88 GHz with 1.27 - 3.63 dB insertion losses across the tuning range. Then, the application of this approach to post-fabrication fine tuning of narrow-band multi-pole filters is studied. Thus, a 2.8% FBW 3-pole Chebyshev filter is designed showing a good trade-off between tuning range, additional inband losses and fractional bandwidth variation.
Keywords :
Chebyshev filters; III-V semiconductors; UHF filters; analogue circuits; circuit tuning; comb filters; dielectric resonator filters; gallium arsenide; substrate integrated waveguides; varactors; waveguide filters; 2-pole filter demonstrator; FBW 3-pole Chebyshev filter; GaAs; analog tuning; compact varactor-loaded combline filters; continuous tunable filter drsign; continuous tunable filter fabrication; continuous tunable filter measurement; coupled coaxial resonators; fractional bandwidth variation; frequency 2.64 GHz to 2.88 GHz; in-band losses; loss 1.27 dB to 3.63 dB; low-cost substrate; narrow-band multipole filters; post-fabrication fine tuning; single-layer SIW technology; substrate integrated waveguide; Capacitance; Cavity resonators; Metals; Microwave filters; Substrates; Tuning; Varactors; Tunable filter; compact filter; continuous tuning; substrate integrated waveguide;
Conference_Titel :
Microwave Conference (EuMC), 2012 42nd European
Print_ISBN :
978-1-4673-2215-7
Electronic_ISBN :
978-2-87487-026-2
