Design of pattern-reconfigurable circularly polarized unidirectional antenna based on quasi-radiator for ISM applications
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Date
2022-11-21
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Heliyon
Abstract
A pattern-reconfigurable circularly polarized antenna for 2.45 GHz industrial, scientific, and medical (ISM) band
applications is designed in this work. The proposed antenna consists of a slotted-stepped monopole connected to a
rectangular ground plane via a shorting side-stub. This converts the omnidirectional radiation pattern of the
antenna into stable unidirectional radiation. To dynamically steer the realized pattern, two switchable RF PIN
diodes are jointly incorporated into the side-stubs to achieve symmetrical radiations in specific operating modes.
In this way, the radiation patterns can be simultaneously tuned in the y directions by the simple switching of the
PIN diodes ON and OFF. The fabricated prototype achieves an S11 smaller than -10dB within the 3dB axial ratio
(AR) bandwidth with stable far-field patterns. The antenna maintains a low-profile and compact size of 0:055λ20
which makes it suitable for body-centric wireless communication (BWC) and personal wireless area networks.
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Citation
Philip Arthur, Mubarak Sani Ellis, Abdul-Rahman Ahmed, Jerry John Kponyo, Design of pattern-reconfigurable circularly polarized unidirectional antenna based on quasi-radiator for ISM applications, Heliyon, Volume 8, Issue 11, 2022, e1172