Artificial dielectric material and its implementation for TEio mode waveguide filter

In this paper, a study on artificial dielectric material and its implementation for a TE10 mode waveguide filter are proposed numerically and experimentally. The use of artificial dielectric material for waveguide filter implementation is intended to produce lower frequency response of filter without enlarging the dimension of waveguide. The filter is designed using a rectangular waveguide which has the width of 72.4 mm and the height of 34 mm with the TE10 cut-off frequency of 2.08GHz. Two identical resonators are inserted into the waveguide and separated in a specific distance. Each resonator is composed of three parts where the left and right parts are made of FR4 epoxy substrate with the same percentage of dimension. Meanwhile, the middle part is made of dielectric material with modified permittivity value using artificial dielectric material of Split Ring Resonator (SRR). The parametric studies are carried out through simulation by changing the distance between resonators and the thickness of resonators. From the measurement, it shows that the frequency response of filter were shifted lower at 1.74GHz with the values of S11 and S21 are −15dB and −3dB, respectively.