Ultra-Wideband Microstrip Filter Using Interdigital Coupled Line Ring Resonator

In this article, a design of Ultra-WideBand bandpass filter is being proposed, which can cover frequencies ranging from 3.1 GHz to 10.6 GHz.The proposed filter structure is consists of a ring resonator, coupled interdigital lines and a simple rectangular Defected Ground Structure(DGS).The FR4 substrate of 0.02 loss tangent and 4.4 dielectric constant with a height of 1.6 mm is chosen for the design of the filter.It has been designed with a size of 30 × 20 square mm.A 20 dB upper stopband up to 16 GHz has been observed in the result of simulation.The filter has been fabricated for it’s experimental verification.