TITLE:
Design of an 868 MHz Printed S-Shape Monopole Antenna
AUTHORS:
Gerard Rushingabigwi, Liguo Sun
KEYWORDS:
Design of an 868 MHz Printed S-Shape Monopole Antenna
JOURNAL NAME:
Journal of Computer and Communications,
Vol.3 No.3,
March
17,
2015
ABSTRACT: The purpose of this work is to design and analyze
an s-shaped printed circuit board (PCB) monopole antenna. The antenna was analyzed
to operate at a resonance frequency band of 868 MHz; acceptable in 915 MHz as well.
The s-shape is selected due to the need of reducing the overall size of the normal
monopole antenna. The printed antenna was designed with an approximate overall size
of 39 × 56 mm2 of which the antenna’s upper side is 26 ×
39 mm2 while its reference ground board was sized at 39 × 30 mm2. The antenna is
fed by a strip line of 3 × 1.5 mm2, in series with a 4.4 pF capacitance and shunt
with an 8.7 nH inductance for purpose of antenna’s impedance matching with the input.
A couple of existing publications showed that PCB antenna is not a new technology;
however not an old technology for telecommunication industry. The raised problem
by this work was duly solved with HFSS as a tool; excellent results are presented.
After duly matching the antenna’s impedance with 50 Ω microstrip feed-line, solutions
for overall performance were analyzed and demonstrated optimal: radiation patterns
were proven omnidirectional, antenna gain optimized. The present antenna prototype’s
overall dimensions can be readjusted according to any industrial and manufacturing
requests.