DESIGN OF A CPW FED POLYGONAL SUPER WIDEBAND ANTENNA WITH DEFECTED ASYMMETRICAL GROUND STRUCTURE
Keywords:
Antenna,, bow-tie shaped radiator,, coplanar ground plane,, CPW-fed,, sensor networks,, sensor node.Abstract
This research introduces a super-wideband antenna for wireless sensor networks that is fed by a
coplanar waveguide. The investigated low-profile design has been prototyped on a single-sided FR4 microwave
substrate and consists of two asymmetrical ground planes and a modified bow-tie-shaped vertical patch. At 3.035
GHz, the lowest frequency in the operational band, the expected antenna measures 0.25λ × 0.20λ in overall
dimensions. A 140.56% operational band from 3.035 to 17.39 GHz was achieved by the investigated antenna, which
was made possible by the vertical radiator's good coupling with the two coplanar ground planes. With an average gain
of 4.56 dBi and an average efficiency of 76.62%, the antenna that is being described exhibits radiation patterns that
are almost omnidirectional across its entire operational range. The antenna has a flat group delay, little phase
distortion, a good responsiveness of the transfer function, and a high fidelity factor. Because of all these features, the
investigated antenna is a strong candidate for use in wireless sensor node applications.
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