Premium
Adjustable compact dual‐band microstrip bandpass filter using T‐shaped resonators
Author(s) -
Khani Shiva,
Makki Seyed Vahab ALDin,
Mousavi Seyed Mohammad Hadi,
Danaie Mohammad,
Rezaei Pejman
Publication year - 2017
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.30864
Subject(s) - resonator , band pass filter , passband , center frequency , insertion loss , microstrip , multi band device , physics , equivalent circuit , filter (signal processing) , optoelectronics , materials science , topology (electrical circuits) , optics , electronic engineering , acoustics , electrical engineering , engineering , antenna (radio) , quantum mechanics , voltage
In this letter, a compact dual‐band bandpass filter (BPF) is designed, analyzed, and fabricated. A loop resonator loaded by two modified T‐shaped resonators, double T‐shaped resonators, and open bended stubs are applied to form the proposed configuration. The coupling spaces between the loop resonators and open bended stubs result in two passbands with the center frequencies of 2.4 GHz and 5.7 GHz. The LC equivalent circuit of the main resonator is introduced to present an analytical description. Without needing to increase the circuit size, the upper passband can be adjusted between 5.72 GHz and 6.93 GHz. The measured data indicates less than 0.64 dB and 0.76 dB insertion losses in the first and second passbands, respectively. Adjustable second center frequency, compact size, low insertion loss, good suppression level, and a symmetrical structure are the marked features of the proposed BPF. Finally, a good agreement between the simulated and measured results is observed.