Tunable Band Pass Filter Design By Using RF Switch

Nurbaiti, Abd Aziz (2010) Tunable Band Pass Filter Design By Using RF Switch. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

A microwave filter is a two-port network used to control the frequency response at a certain point in microwave system by providing transmission at frequencies within the passband of the filter and attenuation at the stopband of the filter. In this project, a tunable microwave band pass filter circuit for the WLAN bandwidth of 2.4GHz (IEEE 802.1lb) is designed, pwposely to tune within the 14 channels of WLAN range. The tuning is done by selecting four main reference channels that is not overlapping each other which are channel 1,5 9 and 13. By using Butterworth Response, the value of lumped elements of the band pass filter circuit is calculated. Shunt stub method is used for filter realization, Kuroda's Identity and Richard's Transformation is used for calculation. All the circuits are simulated by using Microwave Office software (A WR). From the simulation, the circuit layout is obtained and fabricated on FR4 board. For the tuning circuit, RF switch using PIN diode is chose as it has a faster speed and stable repeatable. The fabricated circuit is then measured by using Network Analyzer. This project produced the filter response of lumped elements filter presents better response compared to filter realization circuit.

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