Research Information System
Thesis Type: Postgraduate
Institution Of The Thesis: Orta Doğu Teknik Üniversitesi, Faculty of Engineering, Department of Electrical and Electronics Engineering, Turkey
Approval Date: 2015
Student: RAMAZAN ÇETİNER
Supervisor: ŞİMŞEK DEMİR
Abstract:Electronic scanning is the most desirable feature of radar systems. With electronic scanning, it is possible to steer the main beam of an array antenna instantaneously into a desired direction where no mechanical mechanism is involved in the scanning process. Electronic scanning methods including phase scanning, time delay scanning, and frequency scanning have been used in various radar applications; however new and cheaper scanning methods are still being investigated. It is the purpose of this thesis to investigate an array configuration called frequency diverse array (FDA), which gives rise to range, time, and angle dependent scanning without using phase shifters. In this study, mathematical analysis of FDA are made and DDS based FDA beamforming network is designed. Also FDA implementation is realized with this network. Justification of the mathematical derivations is made by the results of the measurements with the implemented structure. Besides, simulations and measurements of the array with various amplitude tapering coefficients are performed. The drawbacks are also reported during the study, which will be useful for future studies on the subject.