A Millimeter-wave High Selective Lowpass Filter in Suspended Stripline Technology

Abstract

This paper represents design and measurements of a low loss, sharp band-edge roll-off lowpass filter with wide stopband and high rejection level with cut-off frequency at 50 GHz, using suspended stripline (SSL) technology, implemented on 0.127 mm-thick substrate with dielectric constant of 2.2. The proposed structure is comprised of a 13th order generalized Chebyshev lowpass filter which enjoys integrated waveguide-to-SSL transitions at filter ports. This filter can be used in frontend of a millimeter-wave down converter. Final design of filter is analyzed using 3D full-wave simulator. Measurement results are also presented to verify the performance of filter.