Compact Microstripline Phase Shifter Design for C band Frequency Range using RT Duroid 5870 Substrate

This paper presents design and implementation of compact microstripline phase shifter at C band frequency range using RT Duroid 5870 substrate. Phase shifters are key elements of beam-steering antennas which are very useful for Synthetic Aperture Radar (SAR) and microwave communication system. Phase shifters are used to control the main-beam of the phased array antenna. Microstripline phase shifter is used since it is simple to design and easy to fabricate. The main objective of this paper is to design and implement a phase shifter for four elements linear sub array for SAR application. This phase shifter is provided using different lengths for scan angle 0o to 135o. RT Duroid 5870 substrate is used for its lower insertion loss. The important mathematical calculations for finding the dimensions of all the individual component is done using MATLAB and then individual components are designed and simulated using Ansoft Designer (SV) and Sonnet Lite v13.35. The presented phase shifter is designed to operate in C band frequency range between 4 and 8 GHz and center frequency is 5.3 GHz , with low insertion loss and reflection coefficients. This proposed phase shifter is suitable for a modified class of feeding networks for phased antenna arrays.