Simulation and Analysis of Compact Defected Microstrip Structure (DMS) with Narrow Bandwidth Notch Characteristics

A narrowband bandstop filter using hashtag-shaped of defected microstrip structure (DMS) with band-reject characteristic and high-Q is presented in this paper. This paper conducted parametric analysis on the different structure of DMS that consists of different length and width in order to produce a good band-reject response at the resonant of approximately 5.2 GHz. These types of structure were designed and simulated on Roger Duroid RO4350 with a dielectric constant, εr of 3.48 and a thickness of 0.508 mm. The optimum topology of DMS with Hashtag-shape exhibited high selectivity, sharp response as well as high attenuation in the stopband. The simulation performance results showed good and promising results with high Q-factor and narrow bandwidth, and therefore they could be further examined in future works during experimental works. The structure of DMS is useful for microwave applications when the undesired signals need to be removed, such as in wideband systems.