NDLI: Hybrid non-uniform-Q lossy filters with substrate integrated waveguide and microstrip resonators

Content Provider	IET Digital Library
Author	Qiu, Liang Feng Wu, Lin Sheng Yin, Wen Yan Mao, Jun Fa
Abstract	Three lossy filters with flat passband are proposed with substrate integrated waveguide (SIW) and microstrip resonators, designed with the non-uniform-Q method. By properly selecting the lower-Q-to-higher-Q ratio, the 0.2 dB bandwidth of the first filter is obtained to be 215 MHz (17% improvement), which is equivalent to a uniform unloaded Q-factor of 820 at the cost of additional in-band insertion loss (IL) of 0.5 dB, when compared with the full-SIW filters. Further, two techniques are utilised to adjust the Q-factor ratio. One method is implemented by mounting a resistor on each microstrip resonator to reduce its unloaded Q-factor. Then, the 0.2 dB passband of 243 MHz is achieved for the second filter, equivalent to a uniform unloaded Q-factor of 1420. The other method is realised by adjusting the Q-factor due to radiation loss of microstrip resonators. By changing the input/output feeding structures, the 0.2 dB bandwidth of the third filter is enhanced by 32%, at the cost of minimum IL increased by 0.9 dB. The occupied area of the proposed planar hybrid filters is reduced by 15–21% and the passband flatness is much better than that of the uniform-Q filter counterparts, as demonstrated by the simulated and measured results.
Starting Page	92
Ending Page	98
Page Count	7
ISSN	17518725
Volume Number	12
e-ISSN	17518733
Issue Number	Issue 1, Jan (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-map/12/1
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-map.2017.0060
Journal	IET Microwaves, Antennas & Propagation
Publisher Date	2017-09-14
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Band-pass Filter Bandpass Filter Bandwidth 215 MHz Filter And Other Network Flat Passband Frequency 243 MHz Higher-Q Substrate Integrated Waveguide Coupling Path Hybrid Nonuniform-Q Lossy Filter In-band Insertion Loss Input-output Feeding Structure Loss 0.5 DB Lower-Q Microstrip Coupling Path Lower-Q-to-higher-Q Ratio Microstrip Resonator Planar Hybrid Configurations Q Factor Q-factor Ratio SIW Substrate Integrated Waveguide Unloaded Q-factor VHF Filter Waveguide And Microwave Transmission Line Component
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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