folded_dipole_antenna

folded_dipole_antenna - 2009 International Symposium of...

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2009 International Symposium of Space Terahertz. Paper Number: 42 1 Abstract —We report the development of quasi-optical Schottky diode detectors based on folded dipole antennas (FDAs) having high driving point impedances. For a prototype demonstration, we have designed a 200 GHz FDA on a silicon substrate with three turns and nearly 1100 input impedance. For DC signal output, we designed a coplanar strip (CPS) low- pass filter which effectively suppresses the RF (200 GHz) current on the DC lines. The detector circuits are diced into octagons for alignment with the high resistivity silicon lens. Initial responsivity and antenna pattern measurements have been performed, and the results are presented. More research will be done to further optimize the detector design and performance. Index Terms —Terahertz, quasi-optical, detector, Schottky diode, folded-dipole antenna. I. INTRODUCTION ERAHERTZ detectors have a wide range of applications in spectroscopy, imaging, astronomy and bio-sensing [1- 3]. Compared to other detectors such as Golay cells [4, 5] or hot-electron bolometers (HEBs) [6, 7], Schottky diode based detectors [8] have the merits of both fast response and high responsivity. In addition, they can be operated at either room or cryogenic temperature. THz waveguide or quasi- optical detectors employing zero bias Schottky diodes (ZBDs) have been developed and promising results have been reported [8, 9]. However, due to the substantial impedance mismatch between ZBDs (~1000-3000 ) and waveguide or antenna structures (e.g. log-periodic or sinuous antennas), the power coupling efficiency is limited, resulting in relatively low detector responsivity. In this paper, we introduce quasi-optical Schottky diode detectors based on folded dipole antennas (FDA) having high driving point impedances. For a prototype demonstration, we have designed a 200 GHz FDA on a silicon substrate with three turns (N=3) and nearly 1200 input impedance. For DC signal output, we have designed a coplanar strip (CPS) low- pass filter which effectively suppresses the RF (200 GHz) Manuscript received 20 April 2009. This work was supported in part by the U.S. Army National Ground Intelligence Center under Grant W911W5-06-R- 0001. L. Liu. H. Xu, A. W. Lichtenberger, and R. M. Weikle, II are with the School of Engineering and Applied Science, University of Virginia, 351 McCormick Road, Charlottesville, VA 22904-4743, USA (email: ll8j@virginia.edu). Y. Duan and J. L. Hesler are with the Virginia Diodes, Inc., 979 2nd Street NE, Suite 309, Charlottesville, VA 22903, USA. current on the DC lines. The detector circuits are diced into octagons for alignment with the high resistivity silicon lens. Initial responsivity and antenna pattern measurements have
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This note was uploaded on 12/02/2009 for the course ECE 000 taught by Professor O during the Spring '09 term at UCSB.

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folded_dipole_antenna - 2009 International Symposium of...

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