A Compact High-Pass Filter Using Hybrid MicrostripNonuniform CPW with Dual-Mode Resonant Response

Abstract EN

A novel and miniature high-pass filter (HPF) based on a hybrid-coupled microstrip/nonuniform coplanar waveguide (CPW) resonator is proposed in this article, in which the designed CPW has exhibited a wideband dual-mode characteristic within the desired high-pass frequency range.

The implemented filter consists of the top microstrip coupled patches and the bottom modified nonuniformly short-circuited CPW resonator.

Simulated results from the electromagnetic (EM) analysis software and measured results from a vector network analyzer (VNA) show a good agreement.

A designed and fabricated prototype filter having a 3 dB cutoff frequency ( f c ) of 5.78 GHz has shown an ultrawide high-pass behavior, which exhibits the highest passband frequency exceeding 4.

0 f c under the minimum insertion loss (IL) 0.75 dB.

The printed circuit board (PCB) area of the filter is approximately 0.0 6 2 λ g × 0 .

093 λ g , where λ g is the guided wavelength at f c .