Design of miniaturized Ku band narrowband cavity filter

Thesis Type: Doctorate

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

Approval Date: 2018


Supervisor: ŞİMŞEK DEMİR


Frequency multiplexer structures are of a crucial role as an essential part of huge variety of communication systems including, satellite-communication systems, wireless communication systems and radio transmission. They are indispensable multiple port components that are used for combination and separation of specific signals or frequency bandwidths selectively from a single signal or frequency bandwidth in multiport communication system. The main blocks that form a multiplexer are a set of filters, named as channel filters, and junctions connecting to filters to the common port. In satellite-communication systems, waveguide filter structures are mostly preferred and employed as channel filter in multiplexer configuration due to the fact that they are of low insertion loss, high power handling capability and high quality factor. On the other, bulkiness and large sizes of them are troublesome in satellite-communication applications. Therefore, one of the main goals of this thesis is to design miniaturized, compact and weight-reduced channel filter structure including coupled resonators. Also, developing a framework for methodical design involving surface roughness effect and physically realizing the waveguide filter structure as a significant part of the multiplexer with lowest possible size and weight and sharp passband characteristic to be minimized the adjacent channel interference is in the main scope of this study.