Design of a 5.8 GHz Bandstop Filter Using Split Ring Resonator Array

Nowadays, ISM band has been widely used by communication, military, medical and scientific department. The frequencies for this band are 2.4 GHz and 5.8 GHz. Heavy traffic has occurred in this frequency range due to high usage which makes noise easily to occur. Thus, in this work a 5.8 GHz bandstop filter has been designed to filter the noise that present at this frequency band using SRR array. It is designed using CST Microwave Studio software. Designing this filter also requires optimization process i.e. varying the different length of split gap and number of array used. Subsequently, the design is fabricated using Rogers 4003 as the substrate and is measured using Agilent PNA-X network analyzer. The result obtained satisfies a bandstop filter parameters such as insertion loss, return loss, and bandwidth. A 5.8 GHz SRR bandstop filter is successfully designed with 390 MHz bandwidth, insertion loss and return loss of -26.68 and -2.91 dB respectively.