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A CAD model of triple bandpass filter implemented with mushroom structure
Author(s) -
Awasthi Seema,
Biswas Animesh,
Jaleel Akhtar Mohammed
Publication year - 2014
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.20780
Subject(s) - passband , band pass filter , resonator , center frequency , microwave , bandwidth (computing) , filter (signal processing) , prototype filter , m derived filter , elliptic filter , butterworth filter , electronic engineering , physics , materials science , low pass filter , computer science , optoelectronics , engineering , telecommunications , electrical engineering
This article demonstrates the design of planar triple‐band filter using mushroom resonator for significant size reduction of the order 80%. Here, mushroom type resonator is used to realize a triple passband filter using the coupling matrix approach. The electric and magnetic couplings between the mushroom resonators are achieved by proper positioning of corner via which have been analyzed and presented. Finally, the frequency transformation has been applied to design a highly selective 12‐pole triple‐passband cascaded‐quartets filter. This symmetric triple‐band filter is operative at center frequencies 3.41/3.56/3.72 GHz with 100 MHz bandwidth of each band. It is observed that the measured results are in good agreement with the simulated results. A significant size reduction has been achieved while realizing triple‐passband filter, which is as small as 50 mm × 25 mm × 1.27 mm. © 2013 Wiley Periodicals, Inc. Int J RF and Microwave CAE 24:421–428, 2014.