A simple method to design a compact and high performance wideband filter

In this letter, a simple method to design a compact and high performance dual hooks wideband filter with open stubs is presented. By combining the coupled line section with two tapped open stubs, a wideband filter with wide stopband and very high passband selectivity is realized. This filter at center frequency f(0) of 5.3 GHz has presented very good measured characteristics, including 3-dB fractional bandwidth of 85%, very low insertion loss of -0.5 +/- 0.3 dB, wide stopband from 8 to 15 GHz, and very high selectivity near the passband edge. (c) 2007 Wiley Periodicals, Inc.