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Dual‐mode resonator with modified dual‐square‐Loop for WLAN and WiMAX quad‐band filter design
Author(s) -
Liu JiChyun,
Huang Feng Sheng,
Kuei ChingPin,
Liu ChinYen
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.20765
Subject(s) - wimax , multi band device , resonator , band pass filter , bandwidth (computing) , loop (graph theory) , insertion loss , square (algebra) , electronic engineering , microwave , m derived filter , physics , filter (signal processing) , topology (electrical circuits) , electrical engineering , computer science , filter design , engineering , optoelectronics , telecommunications , wireless , mathematics , geometry , combinatorics , antenna (radio)
We propose the improved configurations with dual‐mode dual‐square‐loop resonators (DMDSLR) for quad‐band bandpass filter (BPF) design. The modified DMDSLR filter employs two sets of the loops. The square loop is designed to operate at the first and third resonated frequencies (2.4/5.22 GHz) and the G‐shaped loop is employed at the second and fourth resonated frequencies (3.59/6.6 GHz). The resonant frequency equations of DMDSLR are introduced for simply designing quad‐band BPF. Resonant frequencies can be controlled by tuning the perimeter ratio of the square loops. A systematic design procedure with the design map is applied for accuracy design. To obtain lower insertion loss, higher out‐of‐band rejection level and wider bandwidth of quad‐band, the miniaturized DMDSLR with meander‐line technique is proposed. The proposed filters are successfully simulated and measured showing frequency responses and current distributions. It can be applied to WLAN and WiMAX quad‐band systems. © 2013 Wiley Periodicals, Inc. Int J RF and Microwave CAE 24:332–340, 2014.