A Design of a Compact Coplanar Low Pass Filter for THz applications

This paper presents a new configuration of a coplanar compact low pass filter (LPF) for terahertz applications based on coplanar-waveguide (CPW). It features a compact size with dimensions of 84.38 by 125.60µm<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup>. The filter is mounted on a GaAs substrate having a thickness of 30 µm, a dielectric constant of 12.9 and loss tangent of 0.0001. The filter's cut-off frequency is 0.45 THz, and it exhibits a rejection outside the bandwidth below 20 dB. The design's validity is confirmed through simulations using two independent electromagnetic solvers, highlighting its potential for applications in terahertz imaging, non-destructive testing, satellite communications, medical diagnostics, and biosensing.