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Dual‐band ridge waveguide filters for high‐selectivity wireless base station applications
Author(s) -
Fahmi Mohamed M.,
RuizCruz Jorge A.,
Mansour Raafat R.
Publication year - 2016
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.21013
Subject(s) - multi band device , wireless , filter (signal processing) , resonator , waveguide filter , base station , electronic engineering , microwave , computer science , ridge , band pass filter , coupling (piping) , multiplexing , insertion loss , dual (grammatical number) , prototype filter , topology (electrical circuits) , engineering , electrical engineering , filter design , telecommunications , antenna (radio) , mechanical engineering , paleontology , art , literature , biology
Dual‐band filters simplify the system architecture considerably by replacing doubly multiplexed filters. This is especially important in base stations for wireless communications, where high‐selective filtering functions are required, with very stringent requirements in size and insertion losses. For this goal, compact dual‐band filters realized in air‐filled metallic ridge waveguides are proposed. The dual‐band approach shown in this article allows fulfilling the stringent insertion loss specifications of very selective filtering functions. The ridge waveguide resonators are placed in a canonical folded top‐bottom structure layout. Coupling sections that provide cross‐couplings are realized by irises opened in the intermediate wall. Given the high‐order of the dual‐band filter required for actual wireless applications, an efficient modeling by the mode‐matching method is used. A complete challenging filter prototype with 16 poles and 10 transmission zeros with specifications of typical wireless transceivers is built and tested for verification. © 2016 Wiley Periodicals, Inc. Int J RF and Microwave CAE 26:703–712, 2016.