Abstract
In a standard Schiffman phase shifter a coupled section and a uniform transmission line are used to give a differential phase shift. In order to achieve larger bandwidth, it is necessary to use tight coupled sections which are difficult to realize especially high phase shift and low permittivity. In this paper, an improved wide-band 90° Schiffman phase shifter is presented by using a back to back microstrip line. In this design, the gap of the coupled lines is larger for matching the microstrip back to back than the coupling between the two transmission lines (coupled and uncoupled) can be neglected. Therefore the size of the Schiffman phase shifter can be reduced. Compared with the former microstrip multisection coupled-line configuration, our newly proposed planar one with back-to-back microstrip line is small in size and, meanwhile, has a good performance. As an example, the improved Schiffman phase shifter is simulated. The bandwidth of the phase shifter is around 26% within ±1° errors over the frequency band from 8 to 12 GHz.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
