A compact bandpass filter using CPW-Fed short circuited stub-loaded ring resonators

By varying the substrate material, variation in performance of a compact-sized coplanar waveguide bandpass filter is discussed during this paper. The relevant design of the filter is made and the respective resonant characteristics for every substrate are discussed. To uphold this discussion, CPW-fed dual band bandpass filter with operating frequency at 2.28/4.99 GHz, 3.23GHz and 4 GHz on YBa2Cu3O7, FR4 and RT Duroid respectively are meant. This filter is implemented on 1.6mm thickness FR4 material with relative dielectric of 4.4, YBa2Cu3O7 material with a dielectric constant of 9.78 and RT Duroid material having a dielectric of 2.2 for this discussion. Simulated Insertion loss(S12) and Return loss(S11) Responses shows that YBa2Cu3O7 material could be used to obtaining two passbands with good FBW and low dielectric constants.