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Reflection and transmission properties of a metafilm: With an application to a controllable surface composed of resonant particles, IEEE Trans Electromagn Compat 47 (2005), 853-865. 8. Fluid interactions with metafilms/metasurfaces for tuning, sensing, and microwave-assisted chemical processes, Phys Rev B 83 (2011), 205130. 9. E.S.R. Montalvão, Implementation of polarization converter linearcircular for microstrip antennas using metasurfaces (in Portuguese),ABSTRACT: A wideband bandpass filter based on dual-mode defected ground structure resonator (DGSR) is designed and effectively analysed by utilising the even-/odd-mode theory and equivalent circuit models. The lower and upper cutoff frequencies of the filter can be independently tuned by adjusing the even-and odd-mode resonant frequencies of the dual-mode DGSR, respectively. The fabricated prototype is centred at 2.27 GHz with a wide bandwidth (FBW 63.4%), low insertion loss (0.386 dB), high selectivity and wide stopband. The attenuation slopes in the lower and upper passband transitions are 108.5 and 136.9 dB/GHz, respectively. The stopband rejection is better than 22 dB up to 6 GHz (2.6 f 0 ).

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