Electronically switchable compact quad-band microstrip bandpass filter using varactor perturbed dual-mode resonators
Küçük Resim Yok
Tarih
2018
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Taylor & Francis Ltd
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
In this paper, an electronically switchable quad-band microstrip bandpass filter is designed using varactor perturbed dual-mode resonators. For this purpose, four meandered dual-mode square loop resonators (DMSLRs) having reference patches are nested and varactor diodes are used to serve as perturbation elements. The designed resonator is analyzed by deriving even/odd mode resonance conditions. S-parameters are also calculated according to the even and odd mode input impedances. Stub loaded feedlines are used to couple the DMSLRs to Input/Output (I/O) ports. According to the capacitances of varactor diodes, each passband can be independently turned on and off. Coupling scheme and coupling matrix of the designed filter are introduced to realize the coupling descriptions. Switching operations are also investigated over the frequency responses obtained from coupling matrix. Passbands of the filter are adjusted to 1.4, 1.7, 2.25, and 2.7GHz. The designed filter was also fabricated and measured results show a good agreement with the simulated and theoretical results.
Açıklama
Anahtar Kelimeler
Quad-band, bandpass filter, switchable, varactor, dual-mode resonators (DMRs)
Kaynak
Journal of Electromagnetic Waves and Applications
WoS Q Değeri
Q3
Scopus Q Değeri
Q3
Cilt
32
Sayı
8
