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Reconfigurable Ring Filter with Controllable Frequency Response

Reconfigurable ring filter based on single-side-access ring topology is presented. Using capacitive tuning elements, the electrical length of the ring can be manipulated to shift the nominal center frequency to a desired position. A synthesis is developed to determine the values of the capacitive el...

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Autores principales: Ab Wahab, Norfishah, Mohd Salleh, Mohd Khairul, Ismail Khan, Zuhani, Abd Rashid, Nur Emileen
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Hindawi Publishing Corporation 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4121041/
https://www.ncbi.nlm.nih.gov/pubmed/25121132
http://dx.doi.org/10.1155/2014/671369
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author Ab Wahab, Norfishah
Mohd Salleh, Mohd Khairul
Ismail Khan, Zuhani
Abd Rashid, Nur Emileen
author_facet Ab Wahab, Norfishah
Mohd Salleh, Mohd Khairul
Ismail Khan, Zuhani
Abd Rashid, Nur Emileen
author_sort Ab Wahab, Norfishah
collection PubMed
description Reconfigurable ring filter based on single-side-access ring topology is presented. Using capacitive tuning elements, the electrical length of the ring can be manipulated to shift the nominal center frequency to a desired position. A synthesis is developed to determine the values of the capacitive elements. To show the advantage of the synthesis, it is applied to the reconfigurable filter design using RF lumped capacitors. The concept is further explored by introducing varactor-diodes to continuously tune the center frequency of the ring filter. For demonstration, two prototypes of reconfigurable ring filters are realized using microstrip technology, simulated, and measured to validate the proposed concept. The reconfigured filter using lumped elements is successfully reconfigured from 2 GHz to 984.4 MHz and miniaturized by 71% compared to the filter directly designed at the same reconfigured frequency, while, for the filter using varactor-diodes, the frequency is chosen from 1.10 GHz to 1.38 GHz spreading over 280 MHz frequency range. Both designs are found to be compact with acceptable insertion loss and high selectivity.
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spelling pubmed-41210412014-08-12 Reconfigurable Ring Filter with Controllable Frequency Response Ab Wahab, Norfishah Mohd Salleh, Mohd Khairul Ismail Khan, Zuhani Abd Rashid, Nur Emileen ScientificWorldJournal Research Article Reconfigurable ring filter based on single-side-access ring topology is presented. Using capacitive tuning elements, the electrical length of the ring can be manipulated to shift the nominal center frequency to a desired position. A synthesis is developed to determine the values of the capacitive elements. To show the advantage of the synthesis, it is applied to the reconfigurable filter design using RF lumped capacitors. The concept is further explored by introducing varactor-diodes to continuously tune the center frequency of the ring filter. For demonstration, two prototypes of reconfigurable ring filters are realized using microstrip technology, simulated, and measured to validate the proposed concept. The reconfigured filter using lumped elements is successfully reconfigured from 2 GHz to 984.4 MHz and miniaturized by 71% compared to the filter directly designed at the same reconfigured frequency, while, for the filter using varactor-diodes, the frequency is chosen from 1.10 GHz to 1.38 GHz spreading over 280 MHz frequency range. Both designs are found to be compact with acceptable insertion loss and high selectivity. Hindawi Publishing Corporation 2014 2014-07-08 /pmc/articles/PMC4121041/ /pubmed/25121132 http://dx.doi.org/10.1155/2014/671369 Text en Copyright © 2014 Norfishah Ab Wahab et al. https://creativecommons.org/licenses/by/3.0/ This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Article
Ab Wahab, Norfishah
Mohd Salleh, Mohd Khairul
Ismail Khan, Zuhani
Abd Rashid, Nur Emileen
Reconfigurable Ring Filter with Controllable Frequency Response
title Reconfigurable Ring Filter with Controllable Frequency Response
title_full Reconfigurable Ring Filter with Controllable Frequency Response
title_fullStr Reconfigurable Ring Filter with Controllable Frequency Response
title_full_unstemmed Reconfigurable Ring Filter with Controllable Frequency Response
title_short Reconfigurable Ring Filter with Controllable Frequency Response
title_sort reconfigurable ring filter with controllable frequency response
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4121041/
https://www.ncbi.nlm.nih.gov/pubmed/25121132
http://dx.doi.org/10.1155/2014/671369
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