Design Of Switchable Matched Bandstop Filter

Badrul Hisham, Ahmad (2013) Design Of Switchable Matched Bandstop Filter. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

The report explained a matched bandstop filter based on a lossy allpass network. The lossy all pass network demonstrates the concept and design of perfectly matched bandstop response with a perfectly matched at all frequencies. This filter is based on the half-wavelength {>·/ 2 ) resonator with gap coupling, parallel with an allpass nominally-90°-phase-shift element, which can be optimized to achieve high Q-factor. The reconfigurable matched bandstop filter can be realized by using PIN diodes as a switching element. Second part of this project is to demonstrate a reconfigurable dual-mode ring resonator matched bandstop filter. The dual-mode ring resonator structure is composed by two degenerate modes or splitting resonant frequencies. Two degenerate modes can be excited by perturbing stubs, notches or symmetrical feed lines. The dual-mode ring resonator stub's is located at 135°. This filter provides two state of operation under two conditions. The first condition is that the filter will produce all pass response when the PIN diodes are turned 'ON'. The second condition is that the filter will produce bandstop response when the PIN diodes are turned 'OFF'. Theoretical analysis together with experimental results are presented.

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