Development of Coaxial Transverse Electromagnetic (TEM) Resonator Filter

Zahriladha, Zakaria (2013) Development of Coaxial Transverse Electromagnetic (TEM) Resonator Filter. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Due to the diverse and advanced microwave applications from entertainment via satellite television, to civil and military radar systems. This has shown that Microwave systems have an enormous impact on modern society. Filters are an essential part of these applications, and are the key items in the performance and the cost of such applications, especially in the increasingly congested spectrum. In this thesis the techniques to produce optimal filter performance for a class of filters are developed and demonstrated. This thesis presents a design and development of coaxial cavity bandpass filter, which utilizing the method of tapped-input coupling of the combline filter. The design process have assumed lossless Chebyshev lowpass prototypes, as starting point, thus followed by transformation techniques, and how to apply results obtained from equivalent circuit prototype to real physical filter, the tuning process of filter and optimization of the real physical filter performance demonstrated also, as well as the fabrication and testing. However, the real filter uses components with finite resistance which will produce losses, the relationship between resistance of component and the losses have been shown. Several commercial software programs have been used in the design and development of coaxial cavity bandpass filter such as Matlab software program, ADS software, and Electromagnetic three dimensions Ansoft HFSS software. The coaxial cavity filter has the center frequency of 2.5 GHz and bandwidth of 160 MHz The insertion loss of 0.5 dB insertion loss and return loss better than 15 dB is achieved especially in the passband. this class of filter would be useful in microwave systems where the low insertion loss and high selectivity are crucial, such as in a base station, radar and satellite transceivers.

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