Title :
Ultra-Wideband Phase Shifters
Author_Institution :
Univ. of Queensland, St. Lucia
Abstract :
A method with clear guidelines is presented to design compact planar phase shifters with ultra-wideband (UWB) characteristics. The proposed method exploits broadside coupling between top and bottom elliptical microstrip patches via an elliptical slot located in the mid layer, which forms the ground plane. A theoretical model is used to analyze performance of the proposed devices. The model shows that it is possible to design high-performance UWB phase shifters for the 25deg-48deg range using the proposed structure. The method is used to design 30deg and 45deg phase shifters that have compact size, i.e., 2.5 cm times 2 cm. The simulated and measured results show that the designed phase shifters achieve better than plusmn3deg differential phase stability, less than 1-dB insertion loss, and better than 10-dB return loss across the UWB, i.e., 3.1-10.6 GHz.
Keywords :
microstrip lines; microwave phase shifters; ultra wideband technology; UWB; broadside coupling; elliptical microstrip patch; elliptical slot; frequency 3.1 GHz to 10.6 GHz; ompact planar phase shifter; ultra-wideband phase shifter; Coupling circuits; Guidelines; Microstrip; Microwave devices; Phase measurement; Phase shifters; Phased arrays; Stripline; Transmission line theory; Ultra wideband technology; Aperture coupling; phase shifter; ultra-wideband (UWB);
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2007.904051