Parallel-coupled stub-loaded resonator bandpass filter with ultra-wideband passband on multilayer liquid crystal polymer substrates. Issue 8 (9th July 2015)

• Record Type: Journal Article
• Authors: Almorqi, S.; Shaman, H.; Alamoudi, A.
• Is Part Of: International journal of microwave and wireless technologies. Volume 8:Issue 8(2016)
• Page Start: 1183
• Page End: 1186
• Publication Date: 2015-07-09
• Subjects: Filters, -- Passive components and circuits; Wireless communication systems -- Periodicals; Microwave circuits -- Periodicals; Radio frequency -- Periodicals; 621.381305
• DOI: 10.1017/S1759078715001154
• Languages: English
• ISSNs: 1759-0787

Abstract

Abstract : A multilayer bandpass filter with ultra-wideband passband is presented in this paper. The filter is designed to have a very wide passband with a fractional bandwidth of about 180% at a center frequency of 10.5 GHz. The filter consists of two sections of parallel-coupled lines loaded at the center with short-circuited stub. Each of the coupled line sections and short-circuited stubs is designed to be a quarter-wavelength long at the desired center frequency. As a result, the filter exhibited a selective filtering characteristic equivalent to a five-pole Chebyshev filter with a very low insertion loss. The proposed filter is realized and fabricated using multilayer liquid crystal polymer substrate. The design is successfully realized in theory and verified by full-wave electromagnetic simulation of the full layout and the experiment where excellent agreement is obtained.