DocumentCode :
1758264
Title :
A Polarization Switched, Narrowband, RF Probe System Using a VCSEL Optical Feed
Author :
Quinlan, Terence ; Walker, Stuart D.
Author_Institution :
Access Networks Group, Univ. of Essex, Colchester, UK
Volume :
14
Issue :
12
fYear :
2014
fDate :
Dec. 2014
Firstpage :
4348
Lastpage :
4353
Abstract :
Microwave detection techniques requiring high penetration are often reliant on the use of centimeter wavelengths. Systems such as these can also potentially be capable of being highly portable as well as being suitable for use in harsh and demanding environments. Further advantages of these systems are that they can also be cost effective, offer low levels of RF exposure, and are of potential use in short range nondestructive evaluation applications. Lack of resolution is overcome by the use of a phase contrast technique. Using antennas specifically developed for this purpose, the use of polarization adds a further measurement plane. The 5-GHz crossed patch design described here utilizes commercially available RF switches for ease of implementation and exhibits typically 22-dB isolation between each orthogonal-linearly polarized plane. This allows independent E-plane measurements to be conducted from a common point. Phase sensitive information is preserved by a low power optical bidirectional transmission system based around directly modulated vertical cavity surface emitting lasers. The use of these techniques in combination enables a high resolution, dual plane scanning system capable of remote operation in demanding environments.
Keywords :
microstrip antennas; microwave switches; surface emitting lasers; RF detection; RF probe system; RF switches; VCSEL optical feed; frequency 5 GHz; microwave detection; patch antenna; vertical cavity surface emitting lasers; Antenna measurements; Antennas; Optical sensors; Optical switches; Radio frequency; Vertical cavity surface emitting lasers; Optical transmission; RF detection; patch antenna; polarization;
fLanguage :
English
Journal_Title :
Sensors Journal, IEEE
Publisher :
ieee
ISSN :
1530-437X
Type :
jour
DOI :
10.1109/JSEN.2014.2335991
Filename :
6855312
Link To Document :
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