X-band 7 bit mmic phase shifter design


Thesis Type: Postgraduate

Institution Of The Thesis: Middle East Technical University, Faculty of Engineering, Department of Electrical and Electronics Engineering, Turkey

Approval Date: 2006

Thesis Language: English

Student: Erdinç Erçil

Supervisor: ŞİMŞEK DEMİR

Abstract:

Modern phased array radars require large numbers of electronically controlled phase shifters to steer their beams to the desired direction. The amount of beam steering error depends on the phase resolution of the phase shifters as well as the performance of other parts of the antenna system. The size of the phase shifter in such systems is most of the time needed to be small, which necessitates the MMIC implementation. In the context of this thesis, an X band 7 bit MMIC phase shifter of 2.8125 degree phase resolution, including its layout, is designed using the design kit of OMMIC® Foundry. All bits of the phase shifter are designed to have low return loss so as to minimize the performance egradation due to loading effects upon cascading. Also some structures studied using the design kit of WIN® Foundry are presented. Both designs were performed using ADS®. For the optimum cascading of 7 bits, a MATLAB code was written and used.