Communications: radio wave antennas – Antennas – With spaced or external radio wave refractor
Reexamination Certificate
2007-02-20
2007-02-20
Chen, Shih-Chao (Department: 2821)
Communications: radio wave antennas
Antennas
With spaced or external radio wave refractor
C343S753000
Reexamination Certificate
active
10757987
ABSTRACT:
A low cost antenna in a base station suitable for deployment where high density of wireless users are present in specific directions (e.g., cross roads in urban areas). A lens is used associated with antenna elements to collimate the beam for a longer distance in the desired directions. By using the lens, the need for complex electronics is minimized, thereby reducing the cost of a base station. Another aspect of the present invention enables the lens to be designed precisely by first determining the radiation pattern of each array element according to a corresponding coordinate system, transforming the radiation pattern to a common coordinate system, and determining a composite radiation pattern using the value determined for the common coordinate system. Inverse scattering technique is applied using the composite radiation pattern and the desired collimation pattern to determine the precise shape of the lens.
REFERENCES:
patent: 4472719 (1984-09-01), Hills
patent: 4488156 (1984-12-01), DuFort et al.
patent: 5185613 (1993-02-01), Whatmore et al.
patent: 5815121 (1998-09-01), Collier
patent: 5977904 (1999-11-01), Mizuno et al.
patent: 6246369 (2001-06-01), Brown et al.
patent: 6480167 (2002-11-01), Matthews
Ravishankar and Narasimhan, “Multiple Scattering of EM waves by Dielectric Spheres located in the near field of a source of radiation”, IEEE Transactions on Antennas and Propagation, vol. AP35, No. 4, pp. 399-405, Apr. 1987.
C.A.Fernandes, “Shaped Dielectric lenses for Wireless Millimeter-Wave Applications”, IEEE Antennas & Propagation Magazine, vol. 41, No. 5, pp. 141-151, Oct. 1999.
C.A.Fernandes, Jose G Fernandes, “Performance of Lens Antennas in wireless Indoor Millimeter Wave Applications”, IEEE Transactions on Microwave Theory and Techniques, vol. 47, No. 6, pp. 732-737, Jun. 1999.
Mario GMV Silveirinha, C.A.Fernandes, “Shaped Double-Shell Dielectric Lenses for Wireless millimeter wave applications”, IEEE Transactions on Antennas and Propagation Society International Symposium, 2000., vol. 3, No. 16-21, pp. 1674-1677, Jul. 2000.
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