Constant absolute bandwidth tunable asymmetric order dual‐band BPF with reconfigurable bandwidth using mode control technique
Abstract Herein, a dual‐band bandpass filter with bandwidth tuning and constant bandwidth centre frequency tuning is presented, where the first and second bands are, respectively, of two and three modes. Based on λ/2 resonator modal analysis, a varactor‐ended stub is centrally loaded to a varactor‐t...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2021-02-01
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| Series: | IET Microwaves, Antennas & Propagation |
| Subjects: | |
| Online Access: | https://doi.org/10.1049/mia2.12041 |
| _version_ | 1797989531736080384 |
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| author | Shriman Narayana Nagendra Kumar Yatendra Kumar Singh |
| author_facet | Shriman Narayana Nagendra Kumar Yatendra Kumar Singh |
| author_sort | Shriman Narayana |
| collection | DOAJ |
| description | Abstract Herein, a dual‐band bandpass filter with bandwidth tuning and constant bandwidth centre frequency tuning is presented, where the first and second bands are, respectively, of two and three modes. Based on λ/2 resonator modal analysis, a varactor‐ended stub is centrally loaded to a varactor‐terminated resonator to control even modes, and two varactor‐ended stubs are also loaded off‐centred symmetrically to tune, mostly, odd modes. Using these varactors, the first passband is formed by pairing the first even and odd modes while the second passband using the next pair of even and odd modes. To make the second band bandwidth also constant, the first mode of another resonator kept parallel to the first resonator has been used making the second passband of three poles. S‐matrix has been derived to analyse and coupling matrices have been synthesised to design the filter. A filter has been fabricated where the first band is tunable from 0.9 to 1.24 GHz (31.7%) with absolute bandwidth of 220 MHz while the second passband is tunable from 1.8 to 2.45 GHz (30.5%) with absolute bandwidth of 280 MHz. The first and second bands' bandwidth can be tuned from 110 to 360 MHz and from 230 to 700 MHz. |
| first_indexed | 2024-04-11T08:21:48Z |
| format | Article |
| id | doaj.art-e10b58397fd04d9386c407ef02104a8a |
| institution | Directory Open Access Journal |
| issn | 1751-8725 1751-8733 |
| language | English |
| last_indexed | 2024-04-11T08:21:48Z |
| publishDate | 2021-02-01 |
| publisher | Wiley |
| record_format | Article |
| series | IET Microwaves, Antennas & Propagation |
| spelling | doaj.art-e10b58397fd04d9386c407ef02104a8a2022-12-22T04:34:57ZengWileyIET Microwaves, Antennas & Propagation1751-87251751-87332021-02-0115325327010.1049/mia2.12041Constant absolute bandwidth tunable asymmetric order dual‐band BPF with reconfigurable bandwidth using mode control techniqueShriman Narayana0Nagendra Kumar1Yatendra Kumar Singh2Department of Electrical Engineering Indian Institute of Technology Patna Bihta Bihar IndiaIndian Space Research Organization Bengaluru Karnataka IndiaDepartment of Electrical Engineering Indian Institute of Technology Patna Bihta Bihar IndiaAbstract Herein, a dual‐band bandpass filter with bandwidth tuning and constant bandwidth centre frequency tuning is presented, where the first and second bands are, respectively, of two and three modes. Based on λ/2 resonator modal analysis, a varactor‐ended stub is centrally loaded to a varactor‐terminated resonator to control even modes, and two varactor‐ended stubs are also loaded off‐centred symmetrically to tune, mostly, odd modes. Using these varactors, the first passband is formed by pairing the first even and odd modes while the second passband using the next pair of even and odd modes. To make the second band bandwidth also constant, the first mode of another resonator kept parallel to the first resonator has been used making the second passband of three poles. S‐matrix has been derived to analyse and coupling matrices have been synthesised to design the filter. A filter has been fabricated where the first band is tunable from 0.9 to 1.24 GHz (31.7%) with absolute bandwidth of 220 MHz while the second passband is tunable from 1.8 to 2.45 GHz (30.5%) with absolute bandwidth of 280 MHz. The first and second bands' bandwidth can be tuned from 110 to 360 MHz and from 230 to 700 MHz.https://doi.org/10.1049/mia2.12041band‐pass filtersvaractorsmodal analysisresonator filtersS‐matrix theorycoupled circuits |
| spellingShingle | Shriman Narayana Nagendra Kumar Yatendra Kumar Singh Constant absolute bandwidth tunable asymmetric order dual‐band BPF with reconfigurable bandwidth using mode control technique IET Microwaves, Antennas & Propagation band‐pass filters varactors modal analysis resonator filters S‐matrix theory coupled circuits |
| title | Constant absolute bandwidth tunable asymmetric order dual‐band BPF with reconfigurable bandwidth using mode control technique |
| title_full | Constant absolute bandwidth tunable asymmetric order dual‐band BPF with reconfigurable bandwidth using mode control technique |
| title_fullStr | Constant absolute bandwidth tunable asymmetric order dual‐band BPF with reconfigurable bandwidth using mode control technique |
| title_full_unstemmed | Constant absolute bandwidth tunable asymmetric order dual‐band BPF with reconfigurable bandwidth using mode control technique |
| title_short | Constant absolute bandwidth tunable asymmetric order dual‐band BPF with reconfigurable bandwidth using mode control technique |
| title_sort | constant absolute bandwidth tunable asymmetric order dual band bpf with reconfigurable bandwidth using mode control technique |
| topic | band‐pass filters varactors modal analysis resonator filters S‐matrix theory coupled circuits |
| url | https://doi.org/10.1049/mia2.12041 |
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