A Compact High Pass Filter Using Hybrid Microstrip/Nonuniform CPW with Dual Mode Resonant Response
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 of 5.78 GHz has shown an ultrawide high pass behavior, which exhibits the highest passband frequency exceeding 4. under the minimum insertion loss (IL) 0.75 dB. The printed circuit board (PCB) area of the filter is approximately where is the guided wavelength at