NDLI: Spurious stopband improvement of dual-mode dielectric resonator filters using T-shaped coupling probe

Content Provider	IET Digital Library
Author	Luhaib, Saad W. O. Somjit, Nutapong Hunter, Ian C.
Abstract	This work presents a new design technique for dual-mode dielectric-loaded resonator filter operating at 2.18 GHz by using T-shape coupling probe. A cylindrical dielectric puck is suspended in the middle of metallic cavity and short-circuited on the side walls. Four vertically etched-slots through the dielectric puck from the top to the base of the ceramic puck offer a high unloaded quality factor of 4300 at the fundamental T E 11 δ mode and allows the T-shape coupling to be located close to the centre of the dielectric puck. The size reduction ratio in this resonator was 11% compared with air-filled coaxial resonator. Fourth-poles Chebyshev bandpass filter with planar configuration was designed and implemented by employing two dielectric-loaded cavities. The experimental results show that the spurious-free window of ∼820 MHz from the fundamental frequency of 2.18 GHz and the operational bandwidth of 77 MHz were achieved.
Starting Page	2345
Ending Page	2349
Page Count	5
ISSN	17518725
Volume Number	12
e-ISSN	17518733
Issue Number	Issue 15, Dec (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-map/12/15
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-map.2018.5296
Journal	IET Microwaves, Antennas & Propagation
Publisher Date	2018-08-14
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Air-filled Coaxial Resonator Band-pass Filter Band-stop Filter Bandwidth 77 MHz Cavity Resonator Filter Ceramic Puck Chebyshev Filter Cylindrical Dielectric Puck Dielectric Resonator Filter Dielectric-loaded Cavities Dual-mode Dielectric Resonator Filter Fourth-poles Chebyshev Bandpass Filter Frequency 2.18 GHz Fundamental TE11δ Mode High Unloaded Quality Factor Metallic Cavity Passive Filter Passive Network Planar Configuration Q Factor Size Reduction Ratio Spurious Stopband Improvement Spurious-free Window T-shaped Coupling Probe UHF Filter Vertically Etched-Slot Waveguide And Microwave Transmission Line Component
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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