Communications: radio wave antennas – Antennas – Microstrip
Reexamination Certificate
2006-12-04
2008-10-07
Nguyen, Hoang V (Department: 2821)
Communications: radio wave antennas
Antennas
Microstrip
C343S846000
Reexamination Certificate
active
07432862
ABSTRACT:
A broadband patch antenna including a planar metallic patch sheet that is provided with right-angled edges and is disposed at a predetermined first height above and parallel to the planar base area of an electrically conducting reflector, and a device for feeding an RF signal into the metallic patch sheet. The feeding device encompasses a conductor which is guided in a vertical direction and is insulated through the base area of the reflector and terminates at a feeding point on the metallic patch sheet. To significantly improve the broadband range while keeping the structure of the antenna simple, the metallic patch sheet has the shape of a cross and the conductor of the feeding device is an inner conductor of a coaxial conductor that is positioned between the base area of the reflector and the metallic patch sheet.
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G.Z. Rafi, et al., “Radar Cross Section of Cross-Shaped Microstrip Patch Antennas,” EMC—A Global Concern. IEEE 1995 International Symposium on Electromagnetic Compatibility. Atlanta, Aug. 14-18, 1995, International Symposium on Electromagnetic Compatibility, New York, IEEE, US, Aug. 14, 1995 pp. 303-307, XP000595996.
Jui-Ching Cheng, et al., “Theoretical Modeling of Cavity-Backed Patch Antennas Using a Hybridtechnique,” IEEE Transactions on Antennas and Propagation, IEEE Inc. New York, US, vol. 43, No. 9, Sep. 1, 1995, pp. 1003-1013, XP000522593.
F. Abboud, et al., “Accurate Model for the Input Impedance of Coax-Fed Rectangular Microstrip Antenna with and without Airgaps,” Universite De Nice, France, 1989, pp. 102-106, XP 006517741.
Burr & Brown
Huber & Suhner AG
Nguyen Hoang V
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