Arbitrary Termination Complex Impedances Tunable Bandpass Filter Using Single and Dual-Mode Resonators
This paper presents a design of microstrip line tunable bandpass filter (BPF) with a transmission zero (TZ) that can accommodate arbitrarily terminated input and output port impedances (<inline-formula> <tex-math notation="LaTeX">$Z_{s}$ </tex-math></inline-formula>...
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| Format: | Article |
| Language: | English |
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IEEE
2023-01-01
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| Series: | IEEE Access |
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| Online Access: | https://ieeexplore.ieee.org/document/10155418/ |
| _version_ | 1827915345529143296 |
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| author | Girdhari Chaudhary Yongchae Jeong |
| author_facet | Girdhari Chaudhary Yongchae Jeong |
| author_sort | Girdhari Chaudhary |
| collection | DOAJ |
| description | This paper presents a design of microstrip line tunable bandpass filter (BPF) with a transmission zero (TZ) that can accommodate arbitrarily terminated input and output port impedances (<inline-formula> <tex-math notation="LaTeX">$Z_{s}$ </tex-math></inline-formula> and <inline-formula> <tex-math notation="LaTeX">$Z_{L}\ne ~50~\Omega )$ </tex-math></inline-formula>. We extracted a new coupling matrix to design the proposed tunable BPF and presented an intuitive circuit-level implementation using a single dc-bias controlled single and dual-mode resonators. The proposed tunable BPF integrates the function of tunable filter and matching network into a single circuit. To validate the design, three filter prototypes with different input and output port termination impedances (filter A: 50-to-<inline-formula> <tex-math notation="LaTeX">$50~\Omega $ </tex-math></inline-formula>, filter B: 20-to-<inline-formula> <tex-math notation="LaTeX">$50~\Omega $ </tex-math></inline-formula>, and filter C: (25+j10)-to-<inline-formula> <tex-math notation="LaTeX">$50~\Omega )$ </tex-math></inline-formula> are manufactured and their performances were measured. The experimental results are consistent with the simulation showing that the passband frequency of the BPF can be tuned from 1.65 GHz to 2.08 GHz (23.06%) with the insertion loss variation from 3.40 dB to 4.69 dB. The proposed tunable BPFs achieved frequency selectivity characteristics by locating the TZ at a lower stopband. The proposed arbitrary terminated tunable BPF can allow direct connection between power amplifier (PA)/low noise amplifier (LNA) and antenna without extra matching networks, resulting in smaller circuit size and can enhance overall performance of RF front-end. |
| first_indexed | 2024-03-13T02:58:11Z |
| format | Article |
| id | doaj.art-ff5539f372d64096bccb1723caf257ce |
| institution | Directory Open Access Journal |
| issn | 2169-3536 |
| language | English |
| last_indexed | 2024-03-13T02:58:11Z |
| publishDate | 2023-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Access |
| spelling | doaj.art-ff5539f372d64096bccb1723caf257ce2023-06-27T23:00:46ZengIEEEIEEE Access2169-35362023-01-0111630136302610.1109/ACCESS.2023.328755110155418Arbitrary Termination Complex Impedances Tunable Bandpass Filter Using Single and Dual-Mode ResonatorsGirdhari Chaudhary0https://orcid.org/0000-0003-2060-9860Yongchae Jeong1https://orcid.org/0000-0001-8778-5776JIANT-IT Human Resource Development Center, Division of Electronics Engineering, Jeonbuk National University, Jeonju-si, South KoreaDivision of Electronics Engineering, Jeonbuk National University, Jeonju-si, South KoreaThis paper presents a design of microstrip line tunable bandpass filter (BPF) with a transmission zero (TZ) that can accommodate arbitrarily terminated input and output port impedances (<inline-formula> <tex-math notation="LaTeX">$Z_{s}$ </tex-math></inline-formula> and <inline-formula> <tex-math notation="LaTeX">$Z_{L}\ne ~50~\Omega )$ </tex-math></inline-formula>. We extracted a new coupling matrix to design the proposed tunable BPF and presented an intuitive circuit-level implementation using a single dc-bias controlled single and dual-mode resonators. The proposed tunable BPF integrates the function of tunable filter and matching network into a single circuit. To validate the design, three filter prototypes with different input and output port termination impedances (filter A: 50-to-<inline-formula> <tex-math notation="LaTeX">$50~\Omega $ </tex-math></inline-formula>, filter B: 20-to-<inline-formula> <tex-math notation="LaTeX">$50~\Omega $ </tex-math></inline-formula>, and filter C: (25+j10)-to-<inline-formula> <tex-math notation="LaTeX">$50~\Omega )$ </tex-math></inline-formula> are manufactured and their performances were measured. The experimental results are consistent with the simulation showing that the passband frequency of the BPF can be tuned from 1.65 GHz to 2.08 GHz (23.06%) with the insertion loss variation from 3.40 dB to 4.69 dB. The proposed tunable BPFs achieved frequency selectivity characteristics by locating the TZ at a lower stopband. The proposed arbitrary terminated tunable BPF can allow direct connection between power amplifier (PA)/low noise amplifier (LNA) and antenna without extra matching networks, resulting in smaller circuit size and can enhance overall performance of RF front-end.https://ieeexplore.ieee.org/document/10155418/Arbitrary termination impedancebandpass matching networkmicrostrip coupled linefrequency selective bandpass filtertunable bandpass filtertransmission zero |
| spellingShingle | Girdhari Chaudhary Yongchae Jeong Arbitrary Termination Complex Impedances Tunable Bandpass Filter Using Single and Dual-Mode Resonators IEEE Access Arbitrary termination impedance bandpass matching network microstrip coupled line frequency selective bandpass filter tunable bandpass filter transmission zero |
| title | Arbitrary Termination Complex Impedances Tunable Bandpass Filter Using Single and Dual-Mode Resonators |
| title_full | Arbitrary Termination Complex Impedances Tunable Bandpass Filter Using Single and Dual-Mode Resonators |
| title_fullStr | Arbitrary Termination Complex Impedances Tunable Bandpass Filter Using Single and Dual-Mode Resonators |
| title_full_unstemmed | Arbitrary Termination Complex Impedances Tunable Bandpass Filter Using Single and Dual-Mode Resonators |
| title_short | Arbitrary Termination Complex Impedances Tunable Bandpass Filter Using Single and Dual-Mode Resonators |
| title_sort | arbitrary termination complex impedances tunable bandpass filter using single and dual mode resonators |
| topic | Arbitrary termination impedance bandpass matching network microstrip coupled line frequency selective bandpass filter tunable bandpass filter transmission zero |
| url | https://ieeexplore.ieee.org/document/10155418/ |
| work_keys_str_mv | AT girdharichaudhary arbitraryterminationcompleximpedancestunablebandpassfilterusingsingleanddualmoderesonators AT yongchaejeong arbitraryterminationcompleximpedancestunablebandpassfilterusingsingleanddualmoderesonators |