Abstract
Abstract Distributed sensor networks are becoming more and more widespread due to their substantial benefits to our daily lives. These sensors, in most cases, are distributed in nature and even may require mobility. This, in turn, implies omnidirectional collector units to collect the data from various sensors at arbitrary directions. This work summarizes the performance outcomes of various integrated wide-band antenna structures and solar power generation topologies to achieve equal gain in all directions. Purpose of the array in this instance is contrary to enhance the received signal levels in all directions. Low-cost solutions ranging from the planar helical printed circuit board (PCB) designs to vertical wire helical antennas were investigated. An optimum design structure for multiple ISM bands (868 MHz to 915 MHz) was proposed and characterized considering the cost, size, directional coverage and most significantly RF sensitivity and range of the overall design. The final water-resistant solar-powered wideband transceiver front-end has provided range improvement and omnidirectional radiation pattern. The system consists of a 190mm x 190mm low-cost FR4 substrate and a Wilkinson network to combine the power of 8 helical wire antennas sprinkled along with the solar cells. The self-contained, Sun-powered unit resulted in 4.5-dB sensitivity improvement in measurements.
Highlights
Wireless Sensor Networks (WSNs) are networks that are formed by a combination of various multipurpose devices, that collect sensory data and transfers them over other network nodes or to a central collector gateway
With the rapid advancements in wireless communication, WSNs became attractive for other applications as well, like, environmental change detection, agriculture, medical, industrial, and the Internet of Things (IoT), most recently[1]
It was observed that the signal to noise ratio (SNR) value of the received signal in the case of the array configuration had 4.5dBm better performance than a single helical antenna
Summary
Wireless Sensor Networks (WSNs) are networks that are formed by a combination of various multipurpose devices, that collect sensory data and transfers them over other network nodes or to a central collector gateway. The main limitation in this antenna is its low radiation efficiency at low frequencies because of defected ground structure technique.it can be seen that gain is very low as going from high to low frequencies Another patch antenna array is designed for 2.5GHz application with the addition of frequency selective surface (FSS) layer. The FSS layer has helped to improve the antenna array performance parameters e.g., bandwidth, gain and radiation efficiency This in another hand increases the cost and complexity of structure for our proposed idea. In order to isolate the wireless transceiver system from power and data cables, the design had to reuse the ground plane of the antenna array for the placement of solar cells This structure absorbs solar power and recharges the connected lithium battery, resulting in a selfsufficient network element. Elements of the array have been placed at λg /2 spacing where (λg =177.12 mm) is the guided wavelength
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of Microwaves, Optoelectronics and Electromagnetic Applications
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
