Enhanced Coupling Values in Coupled Microstrip Lines using Metamaterials
In this paper, we show how metamaterials can be used to enhance the coupling values of microstrip directional couplers. Coupling between regular coplanar microstrip lines, in fact, is limited, due to the small ratios between the characteristic impedances of even and odd TEM modes supported by the st...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Spolecnost pro radioelektronicke inzenyrstvi
2008-06-01
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| Series: | Radioengineering |
| Subjects: | |
| Online Access: | http://www.radioeng.cz/fulltexts/2008/08_02_056_060.pdf |
| _version_ | 1818020240200564736 |
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| author | S. E. Lauro A. Toscano L. Vegni |
| author_facet | S. E. Lauro A. Toscano L. Vegni |
| author_sort | S. E. Lauro |
| collection | DOAJ |
| description | In this paper, we show how metamaterials can be used to enhance the coupling values of microstrip directional couplers. Coupling between regular coplanar microstrip lines, in fact, is limited, due to the small ratios between the characteristic impedances of even and odd TEM modes supported by the structure. The broadside configuration or the employment of an overlay are often utilized to overcome this limitation, leading, however, to more bulky components. On the other hand, the employment of metamaterials with a negative real part of the permittivity is able to increase the coupling values, while keeping the profile of the structure very low. A quasi-static model of the structure is developed and physical insights on the operation of the proposed component and on the role of the metamaterial loading are also given. Simple design formulae derived through a conformal mapping technique are presented and validated through proper full wave numerical simulations. |
| first_indexed | 2024-04-14T08:03:23Z |
| format | Article |
| id | doaj.art-7ce2791e3e34400792658387fc0764e8 |
| institution | Directory Open Access Journal |
| issn | 1210-2512 |
| language | English |
| last_indexed | 2024-04-14T08:03:23Z |
| publishDate | 2008-06-01 |
| publisher | Spolecnost pro radioelektronicke inzenyrstvi |
| record_format | Article |
| series | Radioengineering |
| spelling | doaj.art-7ce2791e3e34400792658387fc0764e82022-12-22T02:04:50ZengSpolecnost pro radioelektronicke inzenyrstviRadioengineering1210-25122008-06-011725660Enhanced Coupling Values in Coupled Microstrip Lines using MetamaterialsS. E. LauroA. ToscanoL. VegniIn this paper, we show how metamaterials can be used to enhance the coupling values of microstrip directional couplers. Coupling between regular coplanar microstrip lines, in fact, is limited, due to the small ratios between the characteristic impedances of even and odd TEM modes supported by the structure. The broadside configuration or the employment of an overlay are often utilized to overcome this limitation, leading, however, to more bulky components. On the other hand, the employment of metamaterials with a negative real part of the permittivity is able to increase the coupling values, while keeping the profile of the structure very low. A quasi-static model of the structure is developed and physical insights on the operation of the proposed component and on the role of the metamaterial loading are also given. Simple design formulae derived through a conformal mapping technique are presented and validated through proper full wave numerical simulations.www.radioeng.cz/fulltexts/2008/08_02_056_060.pdfCoupled linesmicrostrip linesmetamaterials |
| spellingShingle | S. E. Lauro A. Toscano L. Vegni Enhanced Coupling Values in Coupled Microstrip Lines using Metamaterials Radioengineering Coupled lines microstrip lines metamaterials |
| title | Enhanced Coupling Values in Coupled Microstrip Lines using Metamaterials |
| title_full | Enhanced Coupling Values in Coupled Microstrip Lines using Metamaterials |
| title_fullStr | Enhanced Coupling Values in Coupled Microstrip Lines using Metamaterials |
| title_full_unstemmed | Enhanced Coupling Values in Coupled Microstrip Lines using Metamaterials |
| title_short | Enhanced Coupling Values in Coupled Microstrip Lines using Metamaterials |
| title_sort | enhanced coupling values in coupled microstrip lines using metamaterials |
| topic | Coupled lines microstrip lines metamaterials |
| url | http://www.radioeng.cz/fulltexts/2008/08_02_056_060.pdf |
| work_keys_str_mv | AT selauro enhancedcouplingvaluesincoupledmicrostriplinesusingmetamaterials AT atoscano enhancedcouplingvaluesincoupledmicrostriplinesusingmetamaterials AT lvegni enhancedcouplingvaluesincoupledmicrostriplinesusingmetamaterials |