World Journal of Engineering Research and Technology

V. Madhusudana Rao* and Dr. B. Prabhakara Rao

ABSTRACT

This paper presents a new concept of a quad band pass filters with three parallel coupled finline structure and concentric split ring resonators. The finline is a wave guiding structure which is increasingly used as millimeter wave component due to various advantages such as reducing size, weight and cost. A design graph is presented here for symmetric three unilateral finline structures to design wide bandpass filter parameters like length (l), width (w) and spacing(s) between finlines. With these parameters we can design third order bandpass filter, having center frequency 10 GHz with fractional bandwidth of 20 %. This wide band pass filter is converted in to quad band pass filter with Metamaterials i.e. (Concentric Split Ring Resonators) on the other side of this filter structure substrate. The hypothesis of V.G. Veselago in 1968 that materials with simultaneous negative effective permittivity ?eff (?) and negative effective permeability ?eff (?) have unusual reversed electromagnetic wave propagation phenomena. The resonance frequency of these SRR can be adjusted by changing design parameters such as metal widths, gap distances for each ring as well as ring to ring separations. Modern communication transceivers require high performance microwave filters with low insertion loss, high frequency selectivity and small group delay variations. Most of the above said parameters are obtained with this proposed quad bandpass filter designed with three coupled finlines with metamaterials and this structure is suitable for millimeter wave components due to various advantages such as reducing size, weight and cost considerably. The suggested quad band pass filter structure is simulated in High Frequency Structure Simulator (HFSS).

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