Wide Bandpass and Narrow Bandstop Microstrip Filters based on Hilbert fractal geometry: design and simulation results

Yaqeen S Mezaal; Halil T Eyyuboglu; Jawad K Ali

doi:10.1371/journal.pone.0115412

Wide Bandpass and Narrow Bandstop Microstrip Filters based on Hilbert fractal geometry: design and simulation results

PLoS One. 2014 Dec 23;9(12):e115412. doi: 10.1371/journal.pone.0115412. eCollection 2014.

Authors

Yaqeen S Mezaal¹, Halil T Eyyuboglu², Jawad K Ali³

Affiliations

¹ Electronic and Communication Engineering Department, Cankaya University, Ankara, Turkey; Microwave Research Group, Electrical Engineering Department, University of Technology, Baghdad, Iraq.
² Electronic and Communication Engineering Department, Cankaya University, Ankara, Turkey.
³ Microwave Research Group, Electrical Engineering Department, University of Technology, Baghdad, Iraq.

Abstract

This paper presents new Wide Bandpass Filter (WBPF) and Narrow Bandstop Filter (NBSF) incorporating two microstrip resonators, each resonator is based on 2nd iteration of Hilbert fractal geometry. The type of filter as pass or reject band has been adjusted by coupling gap parameter (d) between Hilbert resonators using a substrate with a dielectric constant of 10.8 and a thickness of 1.27 mm. Numerical simulation results as well as a parametric study of d parameter on filter type and frequency responses are presented and studied. WBPF has designed at resonant frequencies of 2 and 2.2 GHz with a bandwidth of 0.52 GHz, -28 dB return loss and -0.125 dB insertion loss while NBSF has designed for electrical specifications of 2.37 GHz center frequency, 20 MHz rejection bandwidth, -0.1873 dB return loss and 13.746 dB insertion loss. The proposed technique offers a new alternative to construct low-cost high-performance filter devices, suitable for a wide range of wireless communication systems.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Computer Simulation*
Electric Conductivity
Electronics / instrumentation*
Equipment Design
Filtration / instrumentation*
Fractals*
Models, Theoretical

Grants and funding

This work is supported by the Scientific and Technological Research Council of Turkey (TUBITAK) for PhD Research Fellowship for Foreign Citizens Program under Fund Reference (B.14.2. TBT.0.06.01.03-215.01-24962). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.