Title: Modified vertically installed planar couplers for ultrabroadband multisection quadrature hybrid
Authors: Chen, Hui-Chun
Chang, Chi-Yang
Institute of Communications Engineering
Keywords: modified vertically installed planar (VIP) coupler;multisection hybrid;quadrature hybrid;VIP coupled line
Issue Date: 1-Aug-2006
Abstract: 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
ISSN: 1531-1309
DOI: 10.1109/LMWC.2006.879491
Volume: 16
Issue: 8
Begin Page: 446
End Page: 448
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