| Photonic-Assisted Reactive-Near-Field Analysis of a 3 dB-Tapered Ka-Band Array Antenna |
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Dong-Joon Lee1, Jeong-Jin Kang2, No-Weon Kang1, Wan-Sik Kim3, Wee-Sang Park4, Edward J. Rothwell5, John F. Whitaker6 |
1Korea Research Institute of Standards and Science
2Department of Information and Communication, Dong Seoul College
3LIG Nexl Co. Ltd.
4Department of Electrical and Computer Engineering, Pohang University of Science and Technology
5Department of Electrical and Computer Engineering, Michigan State University
6Center for Ultrafast Optical Science, University of Michigan |
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| Abstract |
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A Ka-band microstrip array antenna for wide-range detection of moving targets is analyzed through a photonicassisted reactive-near-field characterization technique. The antenna array employs a 3-dB-tapered feed network to suppress the sidelobe level while retaining a wide azimuth beamwidth for a wide detection range. The relative nearelectric field patterns of the array and its 3-dB-tapered feed lines have been measured using an electro-optic fieldmapping technique for minimally invasive millimeter-wave sensing. A number of typical limitations on the technique, involving bandwidth, low signal-modulation depth, and high laser-induced noise in high-frequency applications, have been overcome by suppressing the carrier portion of the optical interrogation beam. |
| Key words:
Detection of Moving Target, Microstrip Array Antenna, Electro-Optic Sensing, Near-Field Measurement |
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