Design of tunable microstrip diplexer with reconfigurable filtering characteristics based on dual-mode square loop resonators
Küçük Resim Yok
Tarih
2020
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Wiley
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
A novel compact microstrip diplexer with tunable centre frequencies and reconfigurable filtering characteristics at both channels is presented. The designed diplexer is constructed by coupling two dual-mode square loop resonators (DMSLRs) having different electrical lengths. The DMSLRs are investigated by virtue of the coupled line analysis to evaluate the resonance frequencies, transmission zeros and out-band insertion loss level more conveniently. Centre frequencies of both channels can be independently tuned by the varactor diodes utilised instead of perturbation and reference capacitances. Depending on the specialised values of perturbation and reference capacitances, filtering characteristics of both channels can be reconfigured in terms of transmission zeros. The designed diplexer was fabricated and tested for the experimental studies and the measurements were obtained in a good agreement with the predicted results. Tuning ranges of the measured centre frequency in the first channel are between 1.23 and 1.43 and 1.35 and 1.64 GHz for the filtering characteristics with right- and left-side transmission zeros, respectively. In the second channel, they are 2.07-2.31 and 2.14-2.51 GHz for the filtering characteristics with real- and imaginary-axis transmission zeros, respectively. Isolation between two channels has been obtained better than 22 dB.
Açıklama
Anahtar Kelimeler
varactors, resonator filters, frequency response, band-pass filters, microstrip resonators, UHF filters, microstrip filters, multiplexing, DMSLR, coupled line analysis, resonance frequencies, transmission zero, out-band insertion loss level, reference capacitances, frequency responses, imaginary-axis transmission zeros, tunable microstrip diplexer, reconfigurable filtering characteristics, dual-mode square loop resonators, compact microstrip diplexer, tunable centre frequencies, electrical lengths, varactor diode, perturbation values, real-axis transmission zeros, right-side transmission zeros, left-side transmission zeros, multifunction communication systems, GPS technology, 4G-LTE technology, frequency 2, 14 GHz to 2, 51 GHz, frequency 2, 07 GHz to 2, 31 GHz, frequency 1, 23 GHz to 1, 64 GHz
Kaynak
Iet Microwaves Antennas & Propagation
WoS Q Değeri
Q3
Scopus Q Değeri
Q2
Cilt
14
Sayı
13
