Design and Analysis of Spurious Harmonics Suppressed Microstrip Ultrawide Band Filter using Modified Defected Ground Structure Techniques

In recent days, the growth of wireless communication systems has greatly influenced the communication sectors. Especially, the technological advancements made in the UWB filters play a significant role in redesigning the UWB signals. In this paper, we have proposed a modified Defected Ground Structure (DGS) for Microstrip Ultra-wideband filter. The aim of the study is to design an efficient and lightweight UWB filter design for efficient communication systems. Thus, a different UWB filter is designed with permissible frequency range which improves the performance of the stopband. In this work, the DGS, interdigital, SIR & Shunt stub are employed. Then, a filter prototype is fabricated and measured. The results show that the modified DGS achieves 104.3% Bandwidth, less than 15 dB Loss of return with a frequency of 6.9 GHz for 0.25 λ0 × 0.16 λ0 size. The proposed design has improved the performance of the stopband in the aspects of return loss and the insertion loss.