Compact highpass filter using complementary split ring resonator

In this letter complementary split ring resonator is proposed to design compact highpass filter. Highpass filtering is obtained by overlapping a left-hand and a right-hand (RH) transmission band. A fabricated prototype filter having cut-off frequency (f_c) of 1.8 GHz shows a maximum passband insertion loss less than 1.3 dB up to 3f_c. Implementing area of the filter is smaller than 0.08 λ_g × 0.09 λ_g, λ_g being the guided wavelength at f_c. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2470–2472, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22763