JOURNAL OF ENGINEERING RESEARCH, cilt.10, sa.3A, ss.212-223, 2022 (SCI-Expanded)
This paper includes two new microstrip filter
configurations for high frequency and Ultra-Wide Band applications. The first proposed
filter is a composition of four parallel open-circuited stubs connected by optimized
fractal-structured microstrip line. The filter response is a combination of
three passing regions, namely low pass from 0.1 GHz to 3 GHz, band-pass from
4.5 GHz to 9 GHz and high pass from 10.5 GHz to 13 GHz, separated by two
rejection regions from 3 GHz to 4.5 GHz and 9 GHz to 10.5 GHz. Deep and sharp
rejection regions reaching up to -44.6 dB with 40 % fractional bandwidth (FBW)
are observed with a good electrical performance. Furthermore, with a comparative table, the advantages
of this proposed BSF in terms of FBW, compactness and insertion loss are
compared with recently reported related studies. Secondly a dual-band band pass filter implementing a Stepped-Impedance
resonator (SIR) and a modified
H-shaped structure is presented. This filter is
designed to operate in a low pass region up to 3.58 GHz and a band pass region
from 15.38 to 21.65 GHz, with a wide stopband region between 4.46 and 14.07 GHz. The simulated and
measured results are in good agreement. Compared to its peers, the compact size
and low price allow for a wide application of these filter configurations,
while passing frequencies allow operation in the unlicensed frequency spectrum,
which is popular for high-speed communication