Smart Switchable Beam Antennas for Internet of Things Applications

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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This paper presents a novel beam steerable meander line antenna with varactor diode for X-band applications. Beam steering has been achieved by loading the arms of the meander line antenna with varactor diodes. The capacitances of the varactor diodes have been controlled by DC bias voltage. Instead of varactor diodes, RF-MEMS variable capacitances can be used to scan the beam. Since the insertion loss of MEMS capacitances are small compared to loss of varactor diodes, use of MEMS capacitors will increase th...
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With the recent technological advancements in video sensors, digital signal processing units and digital radio interfaces, low-cost devices such as Wireless Multimedia Sensor Networks (WMSNs) became an important part of surveillance applications. The scarcity of resources for these devices introduces new challenges in terms of energy consumption, and Quality of Service (QoS) guarantees. One of the challenges is processing and transmission of large volumes of multimedia data. In this paper, the efficiency of...
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The vision of wireless multimedia sensor networks (WMSNs) nowadays is to afford real-time multimedia applications using the pervasive wireless sensors around us. This necessitates strict QoS conditions, which have led to new emerging challenges in terms of data delivery in the Internet of Things era. Accordingly, multipath routing protocols with multi-constraints are recommended in WMSNs. In this article, a comprehensive overview of both best effort and real-time multipath routing protocols for WMSNs is per...
Development of multiband microstrip antennas for GPS applications
Önder, Mustafa Caner; Aydın Çivi, Hatice Özlem; Department of Electrical and Electronics Engineering (2019)
In this thesis study, the design, fabrication and measurements of dualband and triband circularly polarized microstrip antennas for GPS applications are presented. Characteristic mode analysis technique is applied to get an insight into circularly polarized patch antennas. A design flow is presented for a circularly polarized L1 GPS band microstrip antenna by using characteristic mode analysis. A single fed L1/L2 GPS band right hand circularly polarized four-slotted patch antenna is designed by using reacti...
Citation Formats
Y. M. Aragbaiye, “Smart Switchable Beam Antennas for Internet of Things Applications,” M.S. - Master of Science, Middle East Technical University, 2021.