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Coilcraft high pass filter designer3/22/2023 In this design, the nonuniform resonator has shown an ultrawide dual-mode frequency characteristic within the desired high-pass range. The improved CPW resonator is obtained by etching slots in the ground plane of the two coupled microstrip rectangular patches. Different from CPW resonators discussed in, the proposed CPW is based on the multisection stepped impedance structure, while a conventional and uniform CPW and a composite CPW using two CPW resonators and a short-circuited stub have been introduced in and, respectively. In this paper, a nonuniformly modified short-circuited CPW has been used to design the ultracompact HPF without any via-hole, as the via-hole often leads to some fabrication problems. However, they are rarely used to implement the HPF. Generally, the dual-mode (or multimode) resonant characteristics have been extensively applied to design UWB BPF and dual-band (or multiband) filters. The above-overviewed high-pass frequency ranges of HPFs are basically up to (2~3). An elliptic-function response HPF based on SIR in coplanar waveguide (CPW) technology has also been researched in. A new approach to designing a maximum flat Butterworth HPF, which transforms an open circuit series stub to short circuit shunt stub, has been extensively investigated in. Among the newly published HPFs, the filters based on the various metamaterial concepts have been demonstrated in. Recently, some new HPFs using various physical structures and design methods have been reported successively. As a result, these methods might lead to fabrication problems and also require large PCB sizes. In RF/microwave wireless applications, the high-pass filters (HPFs) are important circuit elements, while the conventional procedures of implementing the HPFs often utilize the distributed units or quasi-lumped elements, which require grounded via-holes. The printed circuit board (PCB) area of the filter is approximately, where is the guided wavelength at. under the minimum insertion loss (IL) 0.75 dB. 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. Simulated results from the electromagnetic (EM) analysis software and measured results from a vector network analyzer (VNA) show a good agreement. The implemented filter consists of the top microstrip coupled patches and the bottom modified nonuniformly short-circuited CPW resonator. 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.
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