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In this article, an approach is proposed to provide an accurate and fast calculation on the transmission coefficients of an electromagnetic band-gap (EBG) structures where patches are periodically inserted into the microstrip line (capacitive loaded EBG microstrip structure). The stopband performance, such as the center frequency, bandwidth, and attenuation, of these EBG structures can be predicted at a high degree of accuracy through the calculation of the transmission coefficient. The dispersion relation of electromagnetic waves in the structure is derived, plotted, and analyzed. The grating nature of the structure is demonstrated. This approach can be applied to periodic microstrip structures of a similar nature to simplify the analysis and design procedures. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:793–797, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25046

A high-performance stepped-impedance low-pass filter is proposed by using a microstrip line with a longitudinal slot in the ground plane (slot-back microstrip line). The design process is simple and yet effec- tive in improving the performance of the filter structure. Expressions are proposed to obtain the characteristic impedance of a slot-back microstrip line. Because of the high characteristic impedance and slow-wave effect of a slot-back microstrip line, the proposed filter shows a sharper cutoff and a wider stopband with higher attenuation within a smaller circuit area when compared with a conventional stepped-impedance low-pass filter. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1058 -1061, 2008

A novel tapered small-size electromagnetic band-gap (S- EBG) microstrip filter structure is proposed and implemented. This struc- ture is comprised of a main 1D microstrip EBG structure and two auxiliary EBG structures arranged in a compact configuration and Chebyshev distri- bution is adopted to eliminate ripples in the passband. It exhibits an ultra- wide stopband with high attenuation and excellent transmission in the pass- band, yet the circuit area remains small. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 46: 154 -158, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop. 20929