Synthesizing Microstrip Branch-Line Couplers With Predetermined Compact Size and Bandwidth
A new method for designing the microstrip branch- line couplers with predetermined compact size and bandwidth is proposed in this paper. With the proposed approach, the size of the quarter-wavelength transmission line in the branch-line coupler can be reduced greatly. In addition, the proposed coupl...
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Veröffentlicht in: | IEEE transactions on microwave theory and techniques 2007-09, Vol.55 (9), p.1926-1934 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | A new method for designing the microstrip branch- line couplers with predetermined compact size and bandwidth is proposed in this paper. With the proposed approach, the size of the quarter-wavelength transmission line in the branch-line coupler can be reduced greatly. In addition, the proposed couplers can be easily fabricated on the printed circuit board without any lumped element. A chart concludes the relationship between bandwidth and size reduction rate. It shows that open stubs with low impedance perform better than those with high impedance; moreover, the more open stubs with low impedance utilized, the broader the bandwidth will be. Furthermore, the measured frequency responses show good agreement with the theoretical results. |
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ISSN: | 0018-9480 1557-9670 |
DOI: | 10.1109/TMTT.2007.904331 |