Design and Fabrication of a Compact Branch-Line Coupler Using Resonators with Wide Harmonics Suppression Band
The branch-line coupler (BLC) is an important device in radio frequency (RF) and microwave (MW) circuits. The main drawbacks of the conventional BLC are as follows: first, the four long quarter-wavelength (λ/4) transmission line sections occupy a large size, especially at the low frequencies, and se...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-03-01
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| Series: | Electronics |
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| Online Access: | https://www.mdpi.com/2079-9292/11/5/793 |
| _version_ | 1797475254338060288 |
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| author | Sobhan Roshani Salah I. Yahya Saeed Roshani Meysam Rostami |
| author_facet | Sobhan Roshani Salah I. Yahya Saeed Roshani Meysam Rostami |
| author_sort | Sobhan Roshani |
| collection | DOAJ |
| description | The branch-line coupler (BLC) is an important device in radio frequency (RF) and microwave (MW) circuits. The main drawbacks of the conventional BLC are as follows: first, the four long quarter-wavelength (λ/4) transmission line sections occupy a large size, especially at the low frequencies, and second, the presence of unwanted harmonics. This research paper presents a compact 750 MHz BLC with harmonics suppression using resonators. The typical BLC consists of four λ/4 branches, two series arms of 35 Ω and two shunt arms of 50 Ω impedances. In the proposed BLC, these long branches are replaced with two types of compact resonators. The proposed resonators have the same responses at the operating frequency of 750 MHz and suppress higher frequencies. The designed BLC is simulated, fabricated and measured. The results show that the proposed BLC has good performance at 750 MHz with a bandwidth of 200 MHz, which provides more than 26% fractional bandwidth (FBW). It has a very compact size, about 84% size reduction, as compared with the typical BLC. Moreover, the fabricated BLC suppresses the 2nd up to 7th unwanted harmonics with a high suppression level. |
| first_indexed | 2024-03-09T20:42:28Z |
| format | Article |
| id | doaj.art-15dbdb18cc7844e0af1a4d9e6e38d392 |
| institution | Directory Open Access Journal |
| issn | 2079-9292 |
| language | English |
| last_indexed | 2024-03-09T20:42:28Z |
| publishDate | 2022-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Electronics |
| spelling | doaj.art-15dbdb18cc7844e0af1a4d9e6e38d3922023-11-23T22:54:03ZengMDPI AGElectronics2079-92922022-03-0111579310.3390/electronics11050793Design and Fabrication of a Compact Branch-Line Coupler Using Resonators with Wide Harmonics Suppression BandSobhan Roshani0Salah I. Yahya1Saeed Roshani2Meysam Rostami3Department of Electrical Engineering, Kermanshah Branch, Islamic Azad University, Kermanshah 6718997551, IranDepartment of Communication and Computer Engineering, Cihan University-Erbil, Erbil 44001, IraqDepartment of Electrical Engineering, Kermanshah Branch, Islamic Azad University, Kermanshah 6718997551, IranDepartment of Electrical Engineering, Kermanshah Branch, Islamic Azad University, Kermanshah 6718997551, IranThe branch-line coupler (BLC) is an important device in radio frequency (RF) and microwave (MW) circuits. The main drawbacks of the conventional BLC are as follows: first, the four long quarter-wavelength (λ/4) transmission line sections occupy a large size, especially at the low frequencies, and second, the presence of unwanted harmonics. This research paper presents a compact 750 MHz BLC with harmonics suppression using resonators. The typical BLC consists of four λ/4 branches, two series arms of 35 Ω and two shunt arms of 50 Ω impedances. In the proposed BLC, these long branches are replaced with two types of compact resonators. The proposed resonators have the same responses at the operating frequency of 750 MHz and suppress higher frequencies. The designed BLC is simulated, fabricated and measured. The results show that the proposed BLC has good performance at 750 MHz with a bandwidth of 200 MHz, which provides more than 26% fractional bandwidth (FBW). It has a very compact size, about 84% size reduction, as compared with the typical BLC. Moreover, the fabricated BLC suppresses the 2nd up to 7th unwanted harmonics with a high suppression level.https://www.mdpi.com/2079-9292/11/5/793low-pass filter (LPF)elliptical resonatorstopbandpassband5G |
| spellingShingle | Sobhan Roshani Salah I. Yahya Saeed Roshani Meysam Rostami Design and Fabrication of a Compact Branch-Line Coupler Using Resonators with Wide Harmonics Suppression Band Electronics low-pass filter (LPF) elliptical resonator stopband passband 5G |
| title | Design and Fabrication of a Compact Branch-Line Coupler Using Resonators with Wide Harmonics Suppression Band |
| title_full | Design and Fabrication of a Compact Branch-Line Coupler Using Resonators with Wide Harmonics Suppression Band |
| title_fullStr | Design and Fabrication of a Compact Branch-Line Coupler Using Resonators with Wide Harmonics Suppression Band |
| title_full_unstemmed | Design and Fabrication of a Compact Branch-Line Coupler Using Resonators with Wide Harmonics Suppression Band |
| title_short | Design and Fabrication of a Compact Branch-Line Coupler Using Resonators with Wide Harmonics Suppression Band |
| title_sort | design and fabrication of a compact branch line coupler using resonators with wide harmonics suppression band |
| topic | low-pass filter (LPF) elliptical resonator stopband passband 5G |
| url | https://www.mdpi.com/2079-9292/11/5/793 |
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