Wideband phase shifter for 6-18 GHz applications


Thesis Type: Postgraduate

Institution Of The Thesis: Orta Doğu Teknik Üniversitesi, Faculty of Engineering, Department of Electrical and Electronics Engineering, Turkey

Approval Date: 2010

Student: GÖKHAN BOYACIOĞLU

Supervisor: ŞİMŞEK DEMİR

Abstract:

Phase shifters are common microwave circuit devices, which are widely used in telecommunication and radar applications, microwave measurement systems, and many other industrial applications. They are key circuits of T/R modules and are used to form the main beam of the electronically scanned phase array antennas. Wideband operating range is an important criterion for EW applications. Hence, wideband performance of the phase shifter is also important. In this study, four wideband phase shifter circuits are designed, fabricated and measured for 6-18 GHz frequency range. Phase shifters are separately designed in order to get 11.25, 22.5, 45 and 90º phase shifts with minimum phase error and low return losses. Phase shifter circuits are designed and fabricated in microstrip structure onto two different substrates as Rogers TMM10i and Alumina using printed circuit board and thin film production techniques, respectively. Also phase shifter circuits that include microstrip spiral inductors for DC biasing are designed and fabricated using thin film production technique. For each design the fabricated circuits are measured and results are compared with simulation results in the content of this thesis. Circuit designs and EM simulations are performed by using ADS2008®, Sonnet®, and CST®.