Design of UWB high-pass filter using the suspended stripline

An ultra-wideband suspended stripline (SSL) structure high-pass filter with multi-stubs is proposed. A quasi-lumped approach is used to design the filter based on a 7th-order Chebyshev high-pass filter. For the designed high-pass filter, from 5.7 to 30 GHz, the insertion loss is less than −0.5 dB and the return loss is better than −11 dB. From 5.7 to 20 GHz, the return loss is greater than −17 dB, while the suppression of filter is better than −57 dB below 5 GHz.