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

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...

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Bibliographic Details
Published in:Electronics letters 2016-08, Vol.52 (16), p.1393-1395
Main Authors: Psychogiou, D, Gómez-García, R, Peroulis, D
Format: Article
Language:English
Subjects:
Band spectra
Bandpass filters
band‐pass filters
circuit tuning
Controllability
dynamically‐controlled in‐band notches
Electronics
frequency 870 MHz to 1150 MHz
frequency‐agile resonators
high‐attenuation notch
high‐order reflective‐type rejection bands
independently‐controlled transmission zero
Microwave technology
multiband bandstop section
multifrequency BS section
Notches
Rejection
rejection band
RF design
selectivity degree
short‐circuited resonant stubs
Spectra
stub‐loaded‐based bandpass filters
stub‐loaded‐based wide‐BPF
transmission range
tunable rejection bands
Tuning
UHF filters
UHF resonators
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Summary: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 (60 dB) notches that can be independently tuned within the 870–1150 MHz range.
ISSN:0013-5194
1350-911X
1350-911X
DOI:10.1049/el.2016.1307