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Indian Institute of Technology (IIT) Patna 
Lowpass to bandpass switchable and tunable Filter 
Nagendra Kumar, Yatendra Kumar Singh 
Indian Institute of Technology (IIT) Patna 
Application type:
Applied - 2018-07-13 
Application Number:
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Indian Institute of Technology (IIT) Patna 
A tunable lowpass to bandpass switchable filter is presented in this paper. The proposed structure consists of two concentric resonators. Alongwith varactors outer resonator is also loaded with a PIN diode switch. The switching conditions of the PIN diode 􀀀 OFF lead to lowpass filter (LPF) and ON lead to bandpass filter (BPF). At the ON condition of the switch, the outer resonator behaves as two resonators which are coupled to each other through two ways 􀀀 inductively coupled through via-hole and capacitively coupled through the varactor loaded between the resonators. The coupling-coefficient between the two grounded resonators are controlled using varactors to achieve constant fractional bandwidth (CFBW) tunability. The third CFBW tunable band with bandpass characteristic having three transmission zeros across the passband is achieved using inductively coupled inner resonators. A filter is designed, simulated and fabricated. The response shows a tunable LPF having tuning range of 0.55 to 1.4 GHz. One tunable CFBW bandpass response with a tuning range of 0.850 to 1.25 GHz, is achieved with a constant FBW of 64%. The third tunable band with bandpass filtering behavior is achieved with a tunable range of 1.04 GHz to 1.6 GHz with a CFBW of 13.4%. 

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