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This article discusses a technique based on combination of multimode resonators (MMR) and complementary split ring resonators (CSRR) to design multi notch-bands ultra wide-band (UWB) band-pass filters (BPF). The proposed structure consists of two parallel multimode resonators, resulting in a dual notch-band UWB BPF, integrated with a single cell of CSRR to realize the third notch-band. The mechanism of realizing the notchbands is mathematically presented and a triple notch-bands UWB BPF is designed, simulated and fabricated. The overall size of the proposed filter is reported to be around 36 3 7.7 mm 2 where a size reduction of around 35% is demonstrated in comparison to the conventional filter.

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To prevent far-field radiation characteristics degradation while increasing bandwidth, an attempt has been made to design and fabricate a microstrip antenna. An electromagnetic band gap (EBG) structure, including a layer of a metallic ring on a layer of Rogers 4003C substrate, is used. For a better design, a patch antenna with and without the EBG substrate has been simulated. The results show that the bandwidth can be improved up to 1.6 GHz in X-band by adding the EBG substrate. Furthermore, using this structure, a dual-band antenna was obtained as well. Finally, to validate the simulation results, a comparison has been done between simulation data and experimental results which demonstrate good agreement.

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