標題: | Modified vertically installed planar couplers for ultrabroadband multisection quadrature hybrid |
作者: | Chen, Hui-Chun Chang, Chi-Yang 電信工程研究所 Institute of Communications Engineering |
關鍵字: | modified vertically installed planar (VIP) coupler;multisection hybrid;quadrature hybrid;VIP coupled line |
公開日期: | 1-八月-2006 |
摘要: | In this letter, we describe a five-section ultrabroadband 1-9 GHz microstrip quadrature hybrid (90 degrees, - 3 dB coupler), which uses two types of modified vertically installed planar (VIP) couplers and is suitable for conventional printed circuit board realization. The modified VIP couplers provide not only a way to implement tight coupling value with reduced modal phase velocity difference but also a layout flexibility to minimize the discontinuity between sections. An experimental circuit is designed and fabricated with a passband ripple of +/- 0.5 dB, a return loss of less than -20 dB, and an isolation of better than 20 dB over the frequency of 1-9 GHz. Very good agreement between the simulated and measured results is obtained. |
URI: | http://dx.doi.org/10.1109/LMWC.2006.879491 http://hdl.handle.net/11536/11975 |
ISSN: | 1531-1309 |
DOI: | 10.1109/LMWC.2006.879491 |
期刊: | IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS |
Volume: | 16 |
Issue: | 8 |
起始頁: | 446 |
結束頁: | 448 |
顯示於類別: | 期刊論文 |