A novel dsign of UWB microstrip high-pass filter

This paper presents a ultra-wideband (UWB) micro-strip structure high-pass filter with multi-stubs. The proposed filter was designed using a combination of 4 short-circuited stubs and an open-circuited stub in the form of micro-strip lines. The short-circuited stubs are to realize a high-pass filter with a bad band rejection. In order to achieve a steep cutoff, a transmission zero can be added thus an open-circuited stub is used. The passband is 5–19 GHz. The insertion loss is greater than −2dB and the return loss is less than −10dB, while the suppression of the modified filter is better than 30 dB below 4.2GHz.