Quad‐band filter with high skirt selectivity using stub‐loaded nested dual‐open loop resonators. Issue 2 (1st January 2015)

• Record Type: Journal Article
• Authors: Wu, Bian; Qiu, Feng; Lin, Lei
• Is Part Of: Electronics letters. Volume 51:Issue 2(2015)
• Page Start: 166
• Page End: 168
• Publication Date: 2015-01-01
• Subjects: UHF filters -- UHF resonators -- network topology -- poles and zeros; quad‐band filter -- stub‐loaded nested dual‐open loop resonators -- open‐ended stubs -- zero‐degree feed lines -- frequency transformation method -- transmission zeroes -- out‐of‐band selectivity enhancement -- topology circuit design -- coupling matrix synthesis -- frequency 1.58 GHz -- frequency 1.81 GHz -- frequency 2.50 GHz -- frequency 2.66 GHz; Electronics -- Periodicals; 621.381
• DOI: 10.1049/el.2014.3347
• Languages: English
• ISSNs: 0013-5194

Abstract

Abstract : A quad‐band filter with compact size and high skirt selectivity utilising stub‐loaded nested dual‐open loop resonators is presented. By loading open‐ended stubs at the centre of the two nested resonators, two odd modes as well as two even modes can be independently adjusted to realise a flexible quad‐band filtering response. Moreover, both a pair of zero‐degree feed lines and the frequency transformation method are adopted to introduce multiple transmission zeroes, which rightly enhance the out‐of‐band selectivity. According to the topology circuit design and coupling matrix synthesis, a quad‐band filter operating at 1.58/1.81/2.50/2.66 GHz is finally designed and fabricated.