Compact Hexagonal Shape Elliptical Low Pass Filter With Wide Stop Band
In this work a new hexagonal shape compact elliptical low pass filter (LPF) is introduced. To improve and extend the stop band, two additional transmission zeros are created by introducing three semi circular slots in the ground plane. Insertion loss is ;0.85dB in the range of 0 1.5 GHz within the pass band and return loss is >18 dB in the entire pass band. Rejection band is extended up to >20 GHz with attenuation level better than 20dB. Obtained roll off factor is 100 dB/GHz and group delay is 0.25 ns.
IEEE Microwave and Wireless Components Letters