Compact Broadband High-Directivity Microstrip Directional Coupler
Abstract The difference between phase velocities of the odd and even modes in inhomogeneous microstrip coupled lines makes the microstrip directional coupler a poor device regarding directivity. In this work, this issue is successfully compensated by the addition of a matching network at the ports o...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira de Microondas e Optoeletrônica; Sociedade Brasileira de Eletromagnetismo
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| Series: | Journal of Microwaves, Optoelectronics and Electromagnetic Applications |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2179-10742019000200286&lng=en&tlng=en |
| _version_ | 1818481539540844544 |
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| author | Bernardo M. Fabiani Eduardo S. Sakomura Tarcisio A. B. Gripp Daniel C. Nascimento |
| author_facet | Bernardo M. Fabiani Eduardo S. Sakomura Tarcisio A. B. Gripp Daniel C. Nascimento |
| author_sort | Bernardo M. Fabiani |
| collection | DOAJ |
| description | Abstract The difference between phase velocities of the odd and even modes in inhomogeneous microstrip coupled lines makes the microstrip directional coupler a poor device regarding directivity. In this work, this issue is successfully compensated by the addition of a matching network at the ports of coupled lines. Furthermore, the proposed matching network, composed of a single segment of microstrip line, was extensively studied providing significant insights for the design of a compact and broadband device. As result, simple design equations based on coupled lines S-parameters are obtained, as well as the achievable operation limits of the proposed matching network. Finally, in order to validate the proposed design methodology, a compact microstrip directional coupler is constructed to operate with directivity higher than 30 dB and coupling of 17 dB over a 600-MHz bandwidth. |
| first_indexed | 2024-12-10T11:36:20Z |
| format | Article |
| id | doaj.art-18336ad01c8447dd84d3ae925ffd5b30 |
| institution | Directory Open Access Journal |
| issn | 2179-1074 |
| language | English |
| last_indexed | 2024-12-10T11:36:20Z |
| publisher | Sociedade Brasileira de Microondas e Optoeletrônica; Sociedade Brasileira de Eletromagnetismo |
| record_format | Article |
| series | Journal of Microwaves, Optoelectronics and Electromagnetic Applications |
| spelling | doaj.art-18336ad01c8447dd84d3ae925ffd5b302022-12-22T01:50:24ZengSociedade Brasileira de Microondas e Optoeletrônica; Sociedade Brasileira de EletromagnetismoJournal of Microwaves, Optoelectronics and Electromagnetic Applications2179-107418228629210.1590/2179-10742019v18i21521S2179-10742019000200286Compact Broadband High-Directivity Microstrip Directional CouplerBernardo M. FabianiEduardo S. SakomuraTarcisio A. B. GrippDaniel C. NascimentoAbstract The difference between phase velocities of the odd and even modes in inhomogeneous microstrip coupled lines makes the microstrip directional coupler a poor device regarding directivity. In this work, this issue is successfully compensated by the addition of a matching network at the ports of coupled lines. Furthermore, the proposed matching network, composed of a single segment of microstrip line, was extensively studied providing significant insights for the design of a compact and broadband device. As result, simple design equations based on coupled lines S-parameters are obtained, as well as the achievable operation limits of the proposed matching network. Finally, in order to validate the proposed design methodology, a compact microstrip directional coupler is constructed to operate with directivity higher than 30 dB and coupling of 17 dB over a 600-MHz bandwidth.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2179-10742019000200286&lng=en&tlng=enBroadbanddirectional couplerhigh-directivitymatching networkmicrostrip line |
| spellingShingle | Bernardo M. Fabiani Eduardo S. Sakomura Tarcisio A. B. Gripp Daniel C. Nascimento Compact Broadband High-Directivity Microstrip Directional Coupler Journal of Microwaves, Optoelectronics and Electromagnetic Applications Broadband directional coupler high-directivity matching network microstrip line |
| title | Compact Broadband High-Directivity Microstrip Directional Coupler |
| title_full | Compact Broadband High-Directivity Microstrip Directional Coupler |
| title_fullStr | Compact Broadband High-Directivity Microstrip Directional Coupler |
| title_full_unstemmed | Compact Broadband High-Directivity Microstrip Directional Coupler |
| title_short | Compact Broadband High-Directivity Microstrip Directional Coupler |
| title_sort | compact broadband high directivity microstrip directional coupler |
| topic | Broadband directional coupler high-directivity matching network microstrip line |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2179-10742019000200286&lng=en&tlng=en |
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