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. |