Floating Hemispherical Helical Antenna for Ocean Sensor Networks
Author(s)
Loni, Zia M
Espinosa, Hugo G
Thiel, David V
Year published
2019
Metadata
Show full item recordAbstract
Floating wireless sensor networks present unique communications challenges. Monopole and loop antennas have been used in seawater; however, a hemispherical antenna has the advantage of an increased efficiency and propagation range compared to other designs. This paper reports the design, construction, testing, and simulation of a hemispherical antenna and its propagation across the sea surface. Antenna modeling shows a return loss of −15 dB and a radiation efficiency of 57% in a partially submerged condition. The modeled and measured bandwidths were 47% and 36%, respectively. The radiation pattern corresponds to that of a ...
View more >Floating wireless sensor networks present unique communications challenges. Monopole and loop antennas have been used in seawater; however, a hemispherical antenna has the advantage of an increased efficiency and propagation range compared to other designs. This paper reports the design, construction, testing, and simulation of a hemispherical antenna and its propagation across the sea surface. Antenna modeling shows a return loss of −15 dB and a radiation efficiency of 57% in a partially submerged condition. The modeled and measured bandwidths were 47% and 36%, respectively. The radiation pattern corresponds to that of a vertical monopole antenna, when the hemisphere is floating on the water surface. Propagation range measurements in a calm coastal bay showed two separate attenuation trends of 2 dB/m and 4 dB/m, before and after the reference distance (40 m), respectively. The link range was greater than 135 m using a transmit power of 10 dBm and a receiver sensitivity of −100 dBm. Results show that the floating hemispherical antenna can be successfully deployed and used in wireless sensor network applications for coastal areas.
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View more >Floating wireless sensor networks present unique communications challenges. Monopole and loop antennas have been used in seawater; however, a hemispherical antenna has the advantage of an increased efficiency and propagation range compared to other designs. This paper reports the design, construction, testing, and simulation of a hemispherical antenna and its propagation across the sea surface. Antenna modeling shows a return loss of −15 dB and a radiation efficiency of 57% in a partially submerged condition. The modeled and measured bandwidths were 47% and 36%, respectively. The radiation pattern corresponds to that of a vertical monopole antenna, when the hemisphere is floating on the water surface. Propagation range measurements in a calm coastal bay showed two separate attenuation trends of 2 dB/m and 4 dB/m, before and after the reference distance (40 m), respectively. The link range was greater than 135 m using a transmit power of 10 dBm and a receiver sensitivity of −100 dBm. Results show that the floating hemispherical antenna can be successfully deployed and used in wireless sensor network applications for coastal areas.
View less >
Journal Title
IEEE Journal of Oceanic Engineering
Note
This publication has been entered into Griffith Research Online as an Advanced Online Version.
Subject
Electronics, sensors and digital hardware
Electronics, sensors and digital hardware not elsewhere classified
Maritime engineering
Maritime engineering not elsewhere classified
Mechanical engineering
Communications engineering