Dual-Band Filter and Diplexer Design Using Extremely Miniaturized Substrate-Integrated Coaxial Cavity
This paper presents the design of a dual-band filter and a diplexer using an extremely miniaturized substrate-integrated coaxial cavity (SICC) structure. The presented dual-band filter can function as a front-end circuit block connected to 5G antennae, enabling dual-passband operation for 5G applica...
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MDPI AG
2025-05-01
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| author | Chun-Ming Hung Ci-Fang Jheng Keh-Yi Lee Chung-I G. Hsu Min-Hua Ho |
| author_facet | Chun-Ming Hung Ci-Fang Jheng Keh-Yi Lee Chung-I G. Hsu Min-Hua Ho |
| author_sort | Chun-Ming Hung |
| collection | DOAJ |
| description | This paper presents the design of a dual-band filter and a diplexer using an extremely miniaturized substrate-integrated coaxial cavity (SICC) structure. The presented dual-band filter can function as a front-end circuit block connected to 5G antennae, enabling dual-passband operation for 5G applications. The diplexer is designed for use in 5G communication systems, positioned after the 5G antennae to facilitate the switching of transmitting (Tx) and receiving (Rx) signals between the Tx and Rx terminals. The main contribution of this work is the development of a highly miniaturized substrate-integrated coaxial cavity (SICC) to design a dual-band filter (DBF) and a diplexer. The circuit area of the proposed dual-frequency SICC is a mere 2.1% of its conventional substrate-integrated waveguide (SIW) cavity counterpart when operating at the same frequency. A dual-band filter and a diplexer are realized using two and three highly miniaturized SICC resonators, respectively. The dual-band filter is designed to have a transmission zero on each passband side to enhance signal selectively. At most in-band frequencies, the isolation between the diplexer’s channel bands exceeds 20 dB. A sample dual-band filter and diplexer have been fabricated for experimental validation, demonstrating excellent agreement between the measured and simulated data. To the best of the authors’ knowledge, the designed dual-band filter and diplexer achieve the highest circuit area efficiency within the categories of dual-band SIW cavity filters and diplexers. |
| format | Article |
| id | doaj-art-e99430e2d8434589a5c964ab0bd08f70 |
| institution | OA Journals |
| issn | 1424-8220 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj-art-e99430e2d8434589a5c964ab0bd08f702025-08-20T01:49:18ZengMDPI AGSensors1424-82202025-05-01259292110.3390/s25092921Dual-Band Filter and Diplexer Design Using Extremely Miniaturized Substrate-Integrated Coaxial CavityChun-Ming Hung0Ci-Fang Jheng1Keh-Yi Lee2Chung-I G. Hsu3Min-Hua Ho4Universal Microwave Technology Inc., Keelung 206, TaiwanDepartment of Electronic Engineering, National Changhua University of Education, Changhua 500, TaiwanDepartment of Electrical Engineering, Chinese Culture University, Taipei 111, TaiwanDepartment of Electrical Engineering, National Yunlin University of Science and Technology, Yunlin 640, TaiwanDepartment of Electronic Engineering, National Changhua University of Education, Changhua 500, TaiwanThis paper presents the design of a dual-band filter and a diplexer using an extremely miniaturized substrate-integrated coaxial cavity (SICC) structure. The presented dual-band filter can function as a front-end circuit block connected to 5G antennae, enabling dual-passband operation for 5G applications. The diplexer is designed for use in 5G communication systems, positioned after the 5G antennae to facilitate the switching of transmitting (Tx) and receiving (Rx) signals between the Tx and Rx terminals. The main contribution of this work is the development of a highly miniaturized substrate-integrated coaxial cavity (SICC) to design a dual-band filter (DBF) and a diplexer. The circuit area of the proposed dual-frequency SICC is a mere 2.1% of its conventional substrate-integrated waveguide (SIW) cavity counterpart when operating at the same frequency. A dual-band filter and a diplexer are realized using two and three highly miniaturized SICC resonators, respectively. The dual-band filter is designed to have a transmission zero on each passband side to enhance signal selectively. At most in-band frequencies, the isolation between the diplexer’s channel bands exceeds 20 dB. A sample dual-band filter and diplexer have been fabricated for experimental validation, demonstrating excellent agreement between the measured and simulated data. To the best of the authors’ knowledge, the designed dual-band filter and diplexer achieve the highest circuit area efficiency within the categories of dual-band SIW cavity filters and diplexers.https://www.mdpi.com/1424-8220/25/9/2921dual-band filter (DBF)diplexersubstrate-integrated waveguide (SIW)substrate-integrated coaxial cavity (SICC)circuit miniaturization |
| spellingShingle | Chun-Ming Hung Ci-Fang Jheng Keh-Yi Lee Chung-I G. Hsu Min-Hua Ho Dual-Band Filter and Diplexer Design Using Extremely Miniaturized Substrate-Integrated Coaxial Cavity Sensors dual-band filter (DBF) diplexer substrate-integrated waveguide (SIW) substrate-integrated coaxial cavity (SICC) circuit miniaturization |
| title | Dual-Band Filter and Diplexer Design Using Extremely Miniaturized Substrate-Integrated Coaxial Cavity |
| title_full | Dual-Band Filter and Diplexer Design Using Extremely Miniaturized Substrate-Integrated Coaxial Cavity |
| title_fullStr | Dual-Band Filter and Diplexer Design Using Extremely Miniaturized Substrate-Integrated Coaxial Cavity |
| title_full_unstemmed | Dual-Band Filter and Diplexer Design Using Extremely Miniaturized Substrate-Integrated Coaxial Cavity |
| title_short | Dual-Band Filter and Diplexer Design Using Extremely Miniaturized Substrate-Integrated Coaxial Cavity |
| title_sort | dual band filter and diplexer design using extremely miniaturized substrate integrated coaxial cavity |
| topic | dual-band filter (DBF) diplexer substrate-integrated waveguide (SIW) substrate-integrated coaxial cavity (SICC) circuit miniaturization |
| url | https://www.mdpi.com/1424-8220/25/9/2921 |
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