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Ultra‐compact dual mode dual band filter based on separate electric and magnetic coupling paths
Author(s) -
Kamma Anil,
Mukherjee Jayanta
Publication year - 2017
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.21096
Subject(s) - resonator , multi band device , coupling (piping) , filter (signal processing) , passband , band pass filter , optoelectronics , coupling coefficient of resonators , umts frequency bands , m derived filter , materials science , physics , inductive coupling , wimax , electronic engineering , electrical engineering , telecommunications , computer science , optics , low pass filter , engineering , antenna (radio) , metallurgy , wireless
A pair of dual mode independent controllable resonators used to realize dual band pass filter with good frequency selectivity and isolation is presented. The resonators are directly connected to input/output and are coupled through electric and magnetic coupling in two different paths. Magnetic coupling between the resonators is achieved using a common grounded via‐hole between the two set of quarter‐wavelength resonators. Electric coupling is achieved through open edge coupling of the resonators. Two independent resonators with Separate Electric and Magnetic Coupling (SEMC) paths produce an independently controllable dual band filter response and also additional transmission zeros (TZs) at the edges of the pass bands. The TZs are introduced to improve the selectivity of the filter. Filter exhibits desired pass band response at the Universal Mobile Telecommunications System (UMTS) band (1.95‐2.2 GHz) and Worldwide Interoperability for Microwave Access (WiMAX) band (3.4‐3.6 GHz). Proposed compact filter is implemented on RT/Duroid 5880 ( ε r = 2.2) substrate with thickness of 0.785 mm and surface area of 15 × 12 sq. mm.