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Title: Improved wide-band schiffman phase shifter
Authors: Guo, Y.-X. 
Zhang, Z.-Y.
Ong, L.C. 
Keywords: Coupled lines
Patterned ground plane
Phase shifter
Shiffman phase shifter
Wide-band phase shifter
Issue Date: Mar-2006
Citation: Guo, Y.-X., Zhang, Z.-Y., Ong, L.C. (2006-03). Improved wide-band schiffman phase shifter. IEEE Transactions on Microwave Theory and Techniques 54 (3) : 1196-1199. ScholarBank@NUS Repository.
Abstract: In this paper, one improved wide-band Schiffman phase shifter is presented by modifying the ground plane underneath the coupled lines. In this new design, with the ground plane under the coupled lines removed, the even-mode impedance will be increased substantially. Meanwhile, we propose that one additional isolated rectangular conductor is placed under the coupled lines to act as one capacitor so that the odd-mode impedance is decreased. The proposed new design was simulated by the full-wave electromagnetic software IE3D and validated by the measurement. Compared with the cascading microstrip multisection coupled-line configuration, our newly proposed planar one with a patterned ground plane is small in size and, meanwhile, has a good performance. As an example, one Schiffman phase shifter on a double-sided printed circuit board is designed, simulated, fabricated, and measured. The measured amplitude and phase imbalance between the two paths are within 0.5 dB and 5°, respectively, over the frequency band from 1.5 to 3.1 GHz, or around 70% bandwidth. The measured return loss is found to be better than -12 dB over the operating frequency band. © 2006 IEEE.
Source Title: IEEE Transactions on Microwave Theory and Techniques
ISSN: 00189480
DOI: 10.1109/TMTT.2005.864105
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