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in Figure 4, dual bandpass characteristics are obtained at the centre frequencies of 860 and 1810 MHz, which is applicable for personal wireless communication systems. CONCLUSIONSThe nonlinear phase characteristic of the proposed IDGS is analyzed using the equivalent circuit model and experimentally demonstrated. This IDGS is acted as a short-ended dual-band stub circuit with a controllable phase characteristic. The nonlinear phase of the proposed IDGS can be controllable and mainly affected on the DGS width. This IDGS is applicable for multiband operating components. REFERENCES 1. A. Lai, C. Caloz, and T. Itoh, Composite right/left-handed transmission line metamaterials, Microwave Mag 5 (2004), 34 -50. 2. H.-M. Kim and B.-S. Kim, Bandgap and slow/fast-wave characteristics of defected ground structures (DGSs) including left-handed features,ABSTRACT: To build a stable power distribution network for highspeed digital systems, simultaneous switching noise (SSN) in multilayer PCBs and packages needs to be sufficiently suppressed. In this article, a novel triangular-type uniplanar compact electromagnetic band-gap with different bridges designed for power/ground planes is proposed for the ultra-broadband suppression of SSN. The SSN suppression performance of the proposed structure is validated both numerically and experimentally. A Ϫ30 dB suppression bandwidth for SSN is achieved starting at 800 MHz and extending to 15 GHz and beyond, that is, almost the entire noise band.Figure 1 SI/PI and EMI problems generating mechanism due to SSN in the PDN of multilayer structures 1356 ABSTRACT: In this article, resonant characteristics of novel microstrip resonators based on the Sierpinski carpet fractal geometries are proposed in detail.With increasing the iteration order of the Sierpinskibased fractal resonators, the resonant frequency is decreased but the unloaded quality factor is slightly enhanced. The resonant properties are discussed using the RLC equivalent circuit. Additional, the design guide for bandpass filter using the nth order resonator is also developed. Using these fractal resonators, several dual-mode bandpass filters using different order resonators can be designed and fabricated to verify the advantages of the size and insertion loss reduction. It is also found good agreement between the simulation and measurement is achieved.

To supply a power distribution network with stable power in a high‐speed mixed mode system, simultaneous switching noise caused at the multilayer PCB and package structures needs to be sufficiently suppressed. The uniplanar compact electromagnetic bandgap (UC‐EBG) structure is well known as a promising solution to suppress the power noise and isolate noise‐sensitive analog/RF circuits from a noisy digital circuit. However, a typical UC‐EBG structure has several severe problems, such as a limitation in the stop band's lower cutoff frequency and signal quality degradation. To make up for the defects of a conventional EBG structure, a partially located EBG structure with decoupling capacitors is proposed in this paper as a means of both suppressing the power noise propagation and minimizing the effects of the perforated reference plane on the signal quality. The proposed structure is validated and investigated through simulation and measurement in both frequency and time domains.

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