Tri‐band filter using combined E‐type resonators. Issue 3 (1st January 2013)

• Record Type: Journal Article
• Authors: Fan, W.X.; Li, Z.P.; Gong, S.X.
• Is Part Of: Electronics letters. Volume 49:Issue 3(2013)
• Page Start: 193
• Page End: 194
• Publication Date: 2013-01-01
• Subjects: frequency -- frequency -- frequency; band‐pass filters -- microstrip filters -- resonator filters; triband bandpass filter -- combined E‐type resonator -- compact microstrip filter -- CETR -- quarter‐wavelength SIR -- stepped‐impedance resonator -- quarter‐wavelength unit impedance resonator -- passband centre frequency -- impedance ratio -- frequency 1.95 GHz -- frequency 5.2 GHz -- frequency 3.5 GHz; Electronics -- Periodicals; 621.381
• DOI: 10.1049/el.2012.3617
• Languages: English
• ISSNs: 0013-5194

Abstract

Abstract : A compact microstrip tri‐band bandpass filter using novel combined E‐type resonators (CETRs) is presented. The CETR consists of a quarter‐wavelength (λ/4) stepped‐impedance resonator (SIR) and a quarter‐wavelength (λ/4) unit impedance resonator through a via‐hole. These two components are relatively independent. The first and the third passband centre frequencies can be flexibly controlled by tuning the impedance ratio RZ of the SIR, whereas the second passband frequency is fixed. The centre frequency of the second passband can be independently controlled by tuning the lengths of L2 . The filter is designed to operate at 1.95, 5.2, and 3.5 GHz. The simulated and measured results show good agreement.