Title :
Ultra-wideband scattering from resonant structures using optoelectronically switched antennas
Author :
Agi, K. ; Carin, L.
Author_Institution :
Dept. of Electr. Eng., Polytech. Univ., Farmingdale, NY, USA
Abstract :
Summary form only given. Planar antennas are photoconductively switched to generate and coherently detect ultrawideband (UWB), transient radiation. This radiation has a bandwidth from 5 to 70 GHz. The antennas are switched photoconductively using a 76-MHz train of 5-ps-duration, 527-nm-wavelength optical pulses generated from a frequency-doubled pulse-compressed mode-locked Nd-YLF laser. The UWB microwave and millimeter-wave radiation generated by these antennas is used to perform UWB transient scattering measurements from resonant targets. Prototype UWB time-domain scattering measurements have been performed using a unique table-top scattering facility. The experimental results are compared with theory. Particular attention is given to the late-time response of targets using such a system.<>
Keywords :
electromagnetic wave scattering; laser beam applications; microwave antennas; 5 to 70 GHz; 527 nm; 65 GHz; EHF; LiYF4:Nd; MM wave; SHF; YLF:Nd; electromagnetic scattering; frequency-doubled pulse-compressed mode-locked Nd-YLF laser; late-time response; microwave radiation; optical pulses; optoelectronically switched antennas; photoconductive switching; planar antennas; resonant structures; resonant targets; time-domain scattering measurements; transient radiation; transient scattering measurements; ultrawideband scattering; Antenna measurements; Millimeter wave measurements; Optical pulse generation; Optical scattering; Performance evaluation; Photoconductivity; Planar arrays; Radiation detectors; Resonance; Ultra wideband technology;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1992. AP-S. 1992 Digest. Held in Conjuction with: URSI Radio Science Meeting and Nuclear EMP Meeting., IEEE
Conference_Location :
Chicago, IL, USA
Print_ISBN :
0-7803-0730-5
DOI :
10.1109/APS.1992.221419
