Quintuple-mode wideband bandpass filters with improved out-of-band rejection. Issue 4 (14th May 2020)

• Record Type: Journal Article
• Authors: Hameed, Musab; Xiao, Gaobiao; Qiu, Lina; Hameed, Tayyab
• Is Part Of: International journal of microwave and wireless technologies. Volume 12:Issue 4(2020)
• Page Start: 276
• Page End: 281
• Publication Date: 2020-05-14
• Subjects: Microwave filter, -- multi-mode resonator, -- quintuple-mode filter, -- cavity filter; Wireless communication systems -- Periodicals; Microwave circuits -- Periodicals; Radio frequency -- Periodicals; 621.381305
• DOI: 10.1017/S1759078719001338
• Languages: English
• ISSNs: 1759-0787

Abstract

Abstract: This paper presents design of quintuple-mode wideband bandpass filters, implemented with off-centered perturbed metallic cylinders in a rectangular waveguide cavity. Three perturbation cylinders are placed at the bottom of the rectangular waveguide cavity, along with a pair of perpendicularly fed coaxial lines; excite five quasi-transverse magnetic modes to realize the desired passband. The height of the waveguide cavity and the shape of the perturbation cylinders are exploited to shift the resonant modes far away from the passband and achieve a good out-of-band rejection and sharp skirt selectivity. The filter operates at the center frequency of 2.68 GHz with a wide fractional bandwidth of 43%. The proposed filter is fabricated with aluminum. The measured and simulated results are in good agreement with each other.