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—  In this paper, broadband microwave parallel-coupled band-pass filters for wireless microwave technology are presented. Two designs of filters with center frequency of 10.5GHz and 9.5GHz are proposed. A metallic split ring resonator (SRR) as a basic building block for planar filters with dual-band band-pass frequency response, which exhibits simultaneously negative permittivity and permeability as a metamaterial without resorting to additional metallic wires is numerically investigated. The effect of SRRs on these filters to get new two metamaterial dual-band microwave filters is also presented. The dimensions of the second filter are reduced compared to the first filter with better results. Numerical results for all designs are obtained, then the filters are simulated using computer aided design (CAD) in microwave applications (Ansoft HFSS) and implemented on the Roger RT/duroid 6010, Metamaterials (MTMs) are defined as artificial (fabricated by human), effectively homogeneous (p << λg) and exhibiting highly unusual properties (er, µ r < 0) not readily available in nature, where p is the average cell size and it is much smaller than the guided wavelength (λg) (4). Split-ring resonators (SRR) were one of the first particles proposed for metamaterial construction. Metallic metamaterials comprising double split-ring resonators (SRRs) are the main artificial structures to realize magnetic responses at an electromagnetic spectrum above gigahertz frequencies (5)-(8). The realization of backward wave propagation using split ring resonator (SRR) and thin wire (TW) and several other electrically small resonators was considered by Pendry (5), ( 9). The split ring resonator shown in Fig. 2 is used to obtain a negative value of effective permeability over a desired frequency range.

Study the Effect of SRRs on Broadband Microwave Parallel-Coupled Band-Pass Filters