Continuously tunable substrate integrated waveguide bandpass filter in liquid crystal technology with magnetic biasing

• Published in: Electronics letters 2015-10, Vol.51 (20), p.1584-1585
• Main Authors: Prasetiadi, A.E, Karabey, O.H, Weickhmann, C, Franke, T, Hu, W, Jost, M, Nickel, M, Jakoby, R
• Format: Article
• Language: English
• Subjects: bandwidth 600 MHz; band‐pass filters; Chebyshev filters; continuously tuneable substrate integrated waveguide bandpass filter; frequency 22 GHz; frequency 610 MHz; high‐quality factor; lab demonstrator; liquid crystal devices; liquid crystal filled substrate integrated waveguide filter; loss 6 dB; magnetic biasing; microwave filters; Microwave technology; Q‐factor; single resonator measurement; substrate integrated waveguides; three‐pole Chebyshev filter; waveguide filters
• ISSN: 0013-5194; 1350-911X; 1350-911X
• DOI: 10.1049/el.2015.2494

A liquid crystal filled continuously tunable substrate integrated waveguide filter is proposed which has a high-quality (Q) factor. To measure the Q-factor, a single resonator measurement is performed by using magnetic biasing in a lab demonstrator for a proof of concept. The unloaded Q-factor is 102–105.6. The resonator is employed to create a three-pole Chebyshev filter with a centre frequency of 22 GHz and a bandwidth of 600 MHz. Measurement results show a 6 dB insertion loss with a return loss of about 10 dB. The filter is continuously tunable within a tuning range of 610 MHz.