Wideband Filtering Rat-Race Coupler with Shared Triple-Mode Resonator
In this paper, a filtering rat-race coupler (FRC) is presented, which features the merits of a wideband filtering response, good impedance matching at both input and output ports, good isolation, high-frequency selectivity, small in-band phase difference error, a wide stopband, and small size. It wa...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-06-01
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| Series: | Electronics |
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| Online Access: | https://www.mdpi.com/2079-9292/12/12/2701 |
| _version_ | 1797595078045204480 |
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| author | Zimeng Zhao Hongmei Liu Junhao Ren Zhongbao Wang Shaojun Fang |
| author_facet | Zimeng Zhao Hongmei Liu Junhao Ren Zhongbao Wang Shaojun Fang |
| author_sort | Zimeng Zhao |
| collection | DOAJ |
| description | In this paper, a filtering rat-race coupler (FRC) is presented, which features the merits of a wideband filtering response, good impedance matching at both input and output ports, good isolation, high-frequency selectivity, small in-band phase difference error, a wide stopband, and small size. It was composed of two leading triple-mode resonators, one core section, and two <i>λ</i>/2 open-circuited transmission lines (TLs). The core section consisted of three <i>λ</i>/4 TLs and one <i>λ</i>/4 short-circuited parallel coupled line (CL). The leading triple-mode resonator consisted of one <i>λ</i>/4 short-circuited stub and two <i>λ</i>/4 TLs. By loading the triple-mode resonator as the shared component and combining it with the core section, a wideband filtering response with four transmission poles could be achieved. In addition, two transmission zeros were generated by loading the <i>λ</i>/2 open-circuited TLs to the output ports of the FRC. The working principles of the proposed FRC are analyzed, and equations are derived with parametric analysis. For demonstration, a prototype operating at the center frequency of 1.4 GHz was designed, fabricated, and measured. Measurement results show that a fractional bandwidth of more than 60% was achieved under the criteria of 10 dB return loss and 20 dB isolation. In this bandwidth, the amplitude imbalances and phase difference errors were less than 1 dB and 10°, respectively. Additionally, it also exhibited high selectivity and a wide stopband. |
| first_indexed | 2024-03-11T02:32:18Z |
| format | Article |
| id | doaj.art-0137c2fa02f4466e9066706199a703c9 |
| institution | Directory Open Access Journal |
| issn | 2079-9292 |
| language | English |
| last_indexed | 2024-03-11T02:32:18Z |
| publishDate | 2023-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Electronics |
| spelling | doaj.art-0137c2fa02f4466e9066706199a703c92023-11-18T10:09:24ZengMDPI AGElectronics2079-92922023-06-011212270110.3390/electronics12122701Wideband Filtering Rat-Race Coupler with Shared Triple-Mode ResonatorZimeng Zhao0Hongmei Liu1Junhao Ren2Zhongbao Wang3Shaojun Fang4School of Information Science and Technology, Dalian Maritime University, Dalian 116026, ChinaSchool of Information Science and Technology, Dalian Maritime University, Dalian 116026, ChinaSchool of Information Science and Technology, Dalian Maritime University, Dalian 116026, ChinaSchool of Information Science and Technology, Dalian Maritime University, Dalian 116026, ChinaSchool of Information Science and Technology, Dalian Maritime University, Dalian 116026, ChinaIn this paper, a filtering rat-race coupler (FRC) is presented, which features the merits of a wideband filtering response, good impedance matching at both input and output ports, good isolation, high-frequency selectivity, small in-band phase difference error, a wide stopband, and small size. It was composed of two leading triple-mode resonators, one core section, and two <i>λ</i>/2 open-circuited transmission lines (TLs). The core section consisted of three <i>λ</i>/4 TLs and one <i>λ</i>/4 short-circuited parallel coupled line (CL). The leading triple-mode resonator consisted of one <i>λ</i>/4 short-circuited stub and two <i>λ</i>/4 TLs. By loading the triple-mode resonator as the shared component and combining it with the core section, a wideband filtering response with four transmission poles could be achieved. In addition, two transmission zeros were generated by loading the <i>λ</i>/2 open-circuited TLs to the output ports of the FRC. The working principles of the proposed FRC are analyzed, and equations are derived with parametric analysis. For demonstration, a prototype operating at the center frequency of 1.4 GHz was designed, fabricated, and measured. Measurement results show that a fractional bandwidth of more than 60% was achieved under the criteria of 10 dB return loss and 20 dB isolation. In this bandwidth, the amplitude imbalances and phase difference errors were less than 1 dB and 10°, respectively. Additionally, it also exhibited high selectivity and a wide stopband.https://www.mdpi.com/2079-9292/12/12/2701rat-race couplerwideband filtering responsehigh selectivitytriple-mode resonator |
| spellingShingle | Zimeng Zhao Hongmei Liu Junhao Ren Zhongbao Wang Shaojun Fang Wideband Filtering Rat-Race Coupler with Shared Triple-Mode Resonator Electronics rat-race coupler wideband filtering response high selectivity triple-mode resonator |
| title | Wideband Filtering Rat-Race Coupler with Shared Triple-Mode Resonator |
| title_full | Wideband Filtering Rat-Race Coupler with Shared Triple-Mode Resonator |
| title_fullStr | Wideband Filtering Rat-Race Coupler with Shared Triple-Mode Resonator |
| title_full_unstemmed | Wideband Filtering Rat-Race Coupler with Shared Triple-Mode Resonator |
| title_short | Wideband Filtering Rat-Race Coupler with Shared Triple-Mode Resonator |
| title_sort | wideband filtering rat race coupler with shared triple mode resonator |
| topic | rat-race coupler wideband filtering response high selectivity triple-mode resonator |
| url | https://www.mdpi.com/2079-9292/12/12/2701 |
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