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Beam Diffraction by a Planar Grid Structure at 93 GHz

Kim, Moonil and Weikle, Robert M., II and Hacker, Jonathan B. and Rutledge, David B. (1991) Beam Diffraction by a Planar Grid Structure at 93 GHz. In: 1991 Antennas and Propagation Society International Symposium. IEEE , Piscataway, NJ, pp. 150-153. ISBN 0-7803-0144-7 http://resolver.caltech.edu/CaltechAUTHORS:20120419-081631951

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Abstract

The idea of using diode grids for electronic beam steering was introduced by Lam et al [l]. As shown in Figure 1, when an incident beam reflects off the diode grid, the direction of the reflected wave can be controlled by progressively varying the ref1ection phase across the grid. The reflection phase of the diode grid can be controlled by varying the DC bias on the diodes. Later, a monolithic diode grid was fabricated with l600 varactor diodes, and a relative phase shift of 70° at 93 GHz was measured [2]. This work verified the transmission-line theory used to design the grid, but the phase shift was not sufficient to steer the beam, recently, Johansson [3] designed and built a passive planar grating reflector antenna that focused a beam. A rigorous moment-method solution was applied to choose a grating geometry to select the first-order diffracted wave. In this work, using the transmission-line model approach, the goal was to demonstrate that the beam can be steered by building a grid structure without diodes to give a fixed beam shift. In these grids, diodes were replaced by gaps with different sizes to obtain different capacitances needed to steer a beam at 93 GHz. The result show a successful beam shift of 30° with a loss of 2.5 dB.


Item Type:Book Section
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http://dx.doi.org/10.1109/APS.1991.174795DOIUNSPECIFIED
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=174795PublisherUNSPECIFIED
Additional Information:© 1991 IEEE. Date of Current Version: 06 August 2002. This work was supported by the Army Research Office, Northrop Corporation, and the Department of Energy.
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Army Research Office (ARO)UNSPECIFIED
Northrop CorporationUNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
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INSPEC Accession Number4224688
Record Number:CaltechAUTHORS:20120419-081631951
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20120419-081631951
Official Citation:Kim, M.; Weikle, R.M., II; Hacker, J.B.; Rutledge, D.B.; , "Beam diffraction by a planar grid structure at 93 GHz," Antennas and Propagation Society International Symposium, 1991. AP-S. Digest , vol., no., pp.150-153 vol.1, 24-28 Jun 1991 doi: 10.1109/APS.1991.174795 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=174795&isnumber=4455
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:30193
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:19 Apr 2012 17:26
Last Modified:26 Dec 2012 15:05

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