A Planar Dual-Band Coupled-Line Balun With Impedance Transformation and High Isolation
This paper proposes a novel planar dual-band coupled-line balun with impedance transformation and high isolation. Closed-form design equations are obtained based on the classical even-odd mode equivalent approach. For convenience of designing and synthesizing such a novel dual-band balun, the practi...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IEEE
2016-01-01
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| Series: | IEEE Access |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/7784767/ |
| _version_ | 1818618903419420672 |
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| author | Yongle Wu Lidan Yao Weiwei Zhang Weimin Wang Yuanan Liu |
| author_facet | Yongle Wu Lidan Yao Weiwei Zhang Weimin Wang Yuanan Liu |
| author_sort | Yongle Wu |
| collection | DOAJ |
| description | This paper proposes a novel planar dual-band coupled-line balun with impedance transformation and high isolation. Closed-form design equations are obtained based on the classical even-odd mode equivalent approach. For convenience of designing and synthesizing such a novel dual-band balun, the practical ranges of the frequency ratio, terminated impedances, and two free variables are provided under the conventional microstrip fabrication constraints. By adopting four coupled-line sections, six transmission-line stubs, and an isolation resistor, a microstrip prototype balun working at 1.0/2.6 GHz is designed, fabricated, and measured. There is a good agreement between the simulated and measured results. The wide bandwidths of 290 MHz from 0.83 to 1.12 GHz and 270 MHz from 2.44 to 2.71 GHz are obtained with the measured return losses (|S<sub>11</sub>|, |S<sub>22</sub>|, |S<sub>33</sub>|) and the isolation (|S<sub>23</sub>|) better than 10 dB, which effectively confirm the proposed theoretical predictions. |
| first_indexed | 2024-12-16T17:28:59Z |
| format | Article |
| id | doaj.art-1f4520cfecb346f9b74f1905f915890e |
| institution | Directory Open Access Journal |
| issn | 2169-3536 |
| language | English |
| last_indexed | 2024-12-16T17:28:59Z |
| publishDate | 2016-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Access |
| spelling | doaj.art-1f4520cfecb346f9b74f1905f915890e2022-12-21T22:22:59ZengIEEEIEEE Access2169-35362016-01-0149689970110.1109/ACCESS.2016.26401877784767A Planar Dual-Band Coupled-Line Balun With Impedance Transformation and High IsolationYongle Wu0https://orcid.org/0000-0002-3269-7143Lidan Yao1Weiwei Zhang2Weimin Wang3Yuanan Liu4School of Electronic Engineering, Beijing Key Laboratory of Work Safety Intelligent Monitoring, Beijing University of Posts and Telecommunications, Beijing, ChinaSchool of Electronic Engineering, Beijing Key Laboratory of Work Safety Intelligent Monitoring, Beijing University of Posts and Telecommunications, Beijing, ChinaSchool of Electronic Engineering, Beijing Key Laboratory of Work Safety Intelligent Monitoring, Beijing University of Posts and Telecommunications, Beijing, ChinaSchool of Electronic Engineering, Beijing Key Laboratory of Work Safety Intelligent Monitoring, Beijing University of Posts and Telecommunications, Beijing, ChinaSchool of Electronic Engineering, Beijing Key Laboratory of Work Safety Intelligent Monitoring, Beijing University of Posts and Telecommunications, Beijing, ChinaThis paper proposes a novel planar dual-band coupled-line balun with impedance transformation and high isolation. Closed-form design equations are obtained based on the classical even-odd mode equivalent approach. For convenience of designing and synthesizing such a novel dual-band balun, the practical ranges of the frequency ratio, terminated impedances, and two free variables are provided under the conventional microstrip fabrication constraints. By adopting four coupled-line sections, six transmission-line stubs, and an isolation resistor, a microstrip prototype balun working at 1.0/2.6 GHz is designed, fabricated, and measured. There is a good agreement between the simulated and measured results. The wide bandwidths of 290 MHz from 0.83 to 1.12 GHz and 270 MHz from 2.44 to 2.71 GHz are obtained with the measured return losses (|S<sub>11</sub>|, |S<sub>22</sub>|, |S<sub>33</sub>|) and the isolation (|S<sub>23</sub>|) better than 10 dB, which effectively confirm the proposed theoretical predictions.https://ieeexplore.ieee.org/document/7784767/Coupled-line balundual bandimpedance transformationhigh isolation |
| spellingShingle | Yongle Wu Lidan Yao Weiwei Zhang Weimin Wang Yuanan Liu A Planar Dual-Band Coupled-Line Balun With Impedance Transformation and High Isolation IEEE Access Coupled-line balun dual band impedance transformation high isolation |
| title | A Planar Dual-Band Coupled-Line Balun With Impedance Transformation and High Isolation |
| title_full | A Planar Dual-Band Coupled-Line Balun With Impedance Transformation and High Isolation |
| title_fullStr | A Planar Dual-Band Coupled-Line Balun With Impedance Transformation and High Isolation |
| title_full_unstemmed | A Planar Dual-Band Coupled-Line Balun With Impedance Transformation and High Isolation |
| title_short | A Planar Dual-Band Coupled-Line Balun With Impedance Transformation and High Isolation |
| title_sort | planar dual band coupled line balun with impedance transformation and high isolation |
| topic | Coupled-line balun dual band impedance transformation high isolation |
| url | https://ieeexplore.ieee.org/document/7784767/ |
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