NDLI: Stub-loaded-based bandpass filters with dynamically-controlled in-band notches

Content Provider	IET Digital Library
Author	Psychogiou, D. García, R. Gómez Peroulis, D.
Abstract	The RF design of stub-loaded-based wide-band bandpass filters (BPFs) with multiple tunable rejection bands in their transmission range is presented. The proposed concept exploits the replacement of the short-circuited resonant stubs of the stub-loaded-based BPF with multi-band bandstop (BS) sections. Each multi-frequency BS section is formed by several in-parallel-cascaded 90°-long stubs that are terminated by frequency-agile resonators so that each of them results in an independently-controlled transmission zero. In this manner, a plurality of high-order reflective-type rejection bands can be created and arbitrarily controlled. Further operational characteristics include: (i) scalability to any number of rejection bands and degree of selectivity, (ii) independent tuning of each notch without any influence on the remaining ones, and (iii) spectral-merging of multiple stopbands to increase their bandwidth (BW) and enable controllability of the number of active notches in the passband. The aforementioned principles are experimentally validated through a prototype that exhibits a wide-band (fractional BW: 68%), low-loss (<0.7 dB) passband at 1000 MHz and two high-attenuation (>60 dB) notches that can be independently tuned within the 870–1150 MHz range.
Starting Page	1393
Ending Page	1395
Page Count	3
ISSN	00135194
Volume Number	52
e-ISSN	1350911X
Issue Number	Issue 16, Aug (2016)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/el/52/16
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/el.2016.1307
Journal	Electronics Letters
Publisher Date	2016-07-19
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Band-pass Filter Circuit Tuning Dynamically-controlled In-band Notches Filter And Other Network Frequency 870 MHz to 1150 MHz Frequency-agile Resonator High-attenuation Notch High-order Reflective-type Rejection Band Independently-controlled Transmission Zero Multiband Bandtop Section Multifrequency BS Section Rejection Band RF Design Selectivity Degree Short-circuited Resonant Stubs Stub-loaded-based Bandpass Filter Stub-loaded-based Wide-BPF Transmission Range Tunable Rejection Band UHF Filter UHF Resonator Waveguide And Microwave Transmission Line Component
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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