NDLI: Reflection and transmission properties of embedded dipoles and PIFAs inside Concrete at 915 MHz

Content Provider	IEEE Xplore Digital Library
Author	Xiaohua Jin Ali, M.
Copyright Year	2009
Description	Author affiliation: Electrical Engineering Department, University of South Carolina, Columbia, 29208, USA (Xiaohua Jin; Ali, M.)
Abstract	The possibility of using antennas inside a concrete bridge pier is investigated in this work. Dipole and planar inverted-F antennas were simulated both in the presence and absence of steel rebars inside a cylindrical concrete block. Both air dried and saturated concrete samples were considered. It was found that dipole antennas when placed inside a cylindrical concrete block have the desired return loss characteristics. The transmission loss between two dipoles inside dry concrete is between −30 dB to −20 dB for a distance of 251 mm. The loss in free space for the same distance is about −20 dB. The transmission loss is significantly higher when the antennas are placed inside saturated concrete ((−38 to −35 dB). The two dipoles when placed next to steel rebars have very poor return loss characteristics. This is completely alleviated if planar inverted-F antennas are selected instead. The transmission loss with PIFAs for the same distance is about −20 dB for dry concrete and −30 dB for saturated concrete. Clearly if a sensor contains a PIFA and transmits 0 dBm of power the other sensor antenna will receive −38 dBm at a distance of about 10 inches in saturated concrete. Needless to say that sensor sensitivity is usually much smaller than −30 dBm which will allow transmission over greater distances within concrete.
Starting Page	1
Ending Page	4
File Size	577241
Page Count	4
File Format	PDF
ISBN	9781424436477
ISSN	15223965
DOI	10.1109/APS.2009.5172003
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-01
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Reflection Concrete Dipole antennas Moisture Wireless sensor networks Bridges Sensor phenomena and characterization Steel Transmitting antennas Wireless communication
Content Type	Text
Resource Type	Article

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