Microstrip Filter Designing by SRR Metamaterial

• Published in: Wireless personal communications 2013-08, Vol.71 (4), p.3011-3022
• Main Authors: Gupta, Monish, Saxena, Jyoti
• Format: Article
• Language: English
• Subjects: Applied sciences; Attenuation; Banded structure; Circuit properties; Communications Engineering; Computer Communication Networks; Electric, optical and optoelectronic circuits; Electronics; Engineering; Exact sciences and technology; Filtering; Filtration; Metamaterials; Microstrip lines; Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits; Networks; Plugs; Rejection; Signal,Image and Speech Processing
• ISSN: 0929-6212; 1572-834X
• DOI: 10.1007/s11277-012-0986-7

In this paper planar and compact band stop filter using split ring resonator (SRR) metamaterial is proposed. Band stop type attenuation is presented from L-to X-band. Low insertion loss in the pass band and high attenuation in the stop band can be considered as the advantage of this filter. Filter characteristics of SRR is presented using microstrip line. Here SRR is introduced in the substrate layer of microstrip line. It has been observed that the rejection level of the filter in stop band goes on increasing as we increase the number of SRR in the structure. Size of SRR is much less than the operating wavelength thereby several SRR can be introduced in substrate layer to provide a compact structure with high rejection level in the stop band. The frequency of filtering depends on the dimensions of SRR. The effect of varying the dimensions of SRR on the filtering frequency is also presented in this paper. It has also been observed by Nicolson-Ross-Weir approach that at the filtering frequency, value of relative permeability as well as relative permittivity for this structure is negative. This confirms that this structure behaves as a Left Handed medium.