TY - JOUR
T1 - Portable real-time microwave camera at 24 GHz
AU - Ghasr, Mohammad Tayeb
AU - Abou-Khousa, Mohamed A.
AU - Kharkovsky, Sergey
AU - Zoughi, R.
AU - Pommerenke, David
N1 - Funding Information:
Manuscript received March 10, 2011; revised July 11, 2011; accepted August 06, 2011. Date of publication October 21, 2011; date of current version February 03, 2012. This work was supported in part by a grant from NASA Marshall Space Flight Center (MSFC), Huntsville, AL.
PY - 2012/2
Y1 - 2012/2
N2 - This paper presents a microwave camera built upon a two-dimensional array of switchable slot antennas. The camera borrows from modulated scattering techniques to improve isolation among the array elements. The camera was designed to measure vector electric field distribution, be compact, portable, battery operated, possess high dynamic range, and be capable of producing real-time images at video frame-rate. This imaging system utilizes PIN diode-loaded resonant elliptical slot antennas as its array elements integrated in a simple and relatively low-loss waveguide network thus reducing the complexity, cost and size of the array. The sensitivity and dynamic range of this system is improved by utilizing a custom-designed heterodyne receiver and matched filter for demodulation. The performance of the multiplexing scheme, noise-floor and dynamic range of the receivers are presented as well. Sources of errors such as mutual-coupling and array response dispersion are also investigated. Finally, utilizing this imaging system for various applications such as 2-D electric field mapping, and nondestructive testing is demonstrated.
AB - This paper presents a microwave camera built upon a two-dimensional array of switchable slot antennas. The camera borrows from modulated scattering techniques to improve isolation among the array elements. The camera was designed to measure vector electric field distribution, be compact, portable, battery operated, possess high dynamic range, and be capable of producing real-time images at video frame-rate. This imaging system utilizes PIN diode-loaded resonant elliptical slot antennas as its array elements integrated in a simple and relatively low-loss waveguide network thus reducing the complexity, cost and size of the array. The sensitivity and dynamic range of this system is improved by utilizing a custom-designed heterodyne receiver and matched filter for demodulation. The performance of the multiplexing scheme, noise-floor and dynamic range of the receivers are presented as well. Sources of errors such as mutual-coupling and array response dispersion are also investigated. Finally, utilizing this imaging system for various applications such as 2-D electric field mapping, and nondestructive testing is demonstrated.
KW - Electric field mapping
KW - Microwave camera
KW - Nondestructive testing
KW - Real-time imaging
KW - Switchable slot antenna
UR - http://www.scopus.com/inward/record.url?scp=84857029633&partnerID=8YFLogxK
U2 - 10.1109/TAP.2011.2173145
DO - 10.1109/TAP.2011.2173145
M3 - Article
AN - SCOPUS:84857029633
SN - 0018-926X
VL - 60
SP - 1114
EP - 1125
JO - IEEE Transactions on Antennas and Propagation
JF - IEEE Transactions on Antennas and Propagation
IS - 2 PART 2
M1 - 6058691
ER -