Smart Switchable Beam Antennas for Internet of Things Applications

2021-9
Aragbaiye, Yewande Mariam
The main objective of this thesis is to design, fabricate and test novel and compact switchable and steerable beam smart antennas working at 2.4 GHz frequency that will be integrated into 6TiSCH networks for IoT applications. In this thesis, two switchable beam antenna designs are presented. The first antenna design which is a dual-port multi-layered switchable beam antenna can steer and switch its main beam both in the azimuth and the elevation plane in four directions. A parasitic Yagi-Uda layer made up of copper strips serving as reflectors and directors is placed at an optimum distance above a square patch antenna. As a result of its high inter-port isolation, the proposed novel antenna is capable of transmitting and receiving RF signals simultaneously at the same frequency with a high gain of 6.19 dB to 6.28 dB respectively thus reducing the complexity of the antenna system. The second antenna design presented is a 2x2 rectangular patch antenna array with an EBG structure at the ground plane. The antenna array consists of four rectangular microstrip patches all fed by using individual coaxial lines. The ground plane includes an EBG structure made up of square-shaped slots. The 2x2 antenna array can achieve beam steering angles from -36 to 36 degrees by changing the phase and amplitude of the RF signal of the four coaxial ports. The inclusion of the EBG structure reduced the overall antenna size by 32.2%, it also improved the gain, bandwidth, and return loss properties of the antenna.

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Citation Formats
Y. M. Aragbaiye, “Smart Switchable Beam Antennas for Internet of Things Applications,” M.S. - Master of Science, Middle East Technical University, 2021.