Matched bandstop resonator with tunable K-inverter

Peng Wen Wong, Ian C. Hunter, Roger D. Pollard
2007 2007 European Microwave Conference  
This paper demonstrates a matched bandstop resonator with a tunable K inverter. Two separated λ/4 resonators are coupled through a tunable impedance inverter which consists of a varactor loaded microstrip T-shunt stub. In contrast to conventional K-inverter realizations, which possess narrowband properties, this paper demonstrates a physical realization of a novel tunable K-inverter using a varactor diode. Theoretical analysis together with the experimental results is presented in this paper.
more » ... e optimum coupling value can be easily achieved by independently tuning the varactor where an enhanced notch response with 64dB attenuation is measured and shown in this paper. Index Terms -Notch filter, immitance inverter.
doi:10.1109/eumc.2007.4405279 fatcat:6bh6u6xy4zhfbpfjpeqfi3ycna