Development Of A 2.4GHz Band Pass Filter Using Microstrip Technologies

Abdul Rani , Othman and Chairulsyah, Wasli (2005) Development Of A 2.4GHz Band Pass Filter Using Microstrip Technologies. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This short-term project report discusses the development process carried out for the planning, designing, simulation, fabrication and testing of2.4 GHz Bandpass Filter by using Micorstrip Technologies. For the project we applied modular approach and used parallel-coupled lines filter topology. We used various value-aided software tools such as MATLAB (V 7.0) a CAD (V 10), Microwave Office (2003), visual Systems (2003) to enhance the design process. We conducted puff simulations in order to categorize the specifications for a filter to be fabricated either by hand or by using a milling machine. For desired results based on simulation analysis, we chosen Quick Circuit Milling machine and CAD tools to fabricate the filter simulated. The measurements of the filter characteristics and the effect of manufacturing tolerance on filter losses also analyzed. Subsequently it was found that a manufacturing tolerance of 1 % could have a very significant effect on filter losses. We determined optimal parameters and analyzed specifications for BPF fabrication. For the optimal result, three samples were fabricated with the help of Microwave Office tools. Among them we chose the best one by measuring the response of the filter with vector network analyzer. Both experimental and calculated results were compared. Subsequently it was verified that the measured results provided better performance than calculated results for the 2.4 BPF designed. The report also insights the basic design problem encountered during the project such as the evaluation of the physical dimensions of the microstrip lines. The band pass filter designed can be used at the output of the oscillator to take out the required frequency or at the input of the receiver and the amplifier to pass the required frequency.

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