Linear polarization planar microstrip antenna array with...

Communications: radio wave antennas – Antennas – Microstrip

Reexamination Certificate

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C343S846000

Reexamination Certificate

active

06999030

ABSTRACT:
A planar microstrip antenna includes one or more aperture-fed circular patch radiating elements capacitively coupled to respective parasitic strip elements. The circular patches are symmetrically disposed above respective ground plane apertures, and the parasitic strip elements are annular sectors that are co-planar and concentric with the circular patches, and placed adjacent to the periphery of each circular patch. The disclosed geometry enhances the input impedance bandwidth, and significantly reduces off-boresight radiation variability to provide beam directivity that is more uniform over both frequency and direction.

REFERENCES:
patent: 4554549 (1985-11-01), Fassett et al.
patent: 4821040 (1989-04-01), Johnson et al.
patent: 5777581 (1998-07-01), Lilly et al.
patent: 5943016 (1999-08-01), Snyder et al.
patent: 5955994 (1999-09-01), Staker et al.
patent: 6061025 (2000-05-01), Jackson et al.
patent: 6788257 (2004-09-01), Fang et al.
Zaiping Nie et al.; “Analysis of the Annular-Ring-Loaded Circular-Disk Microstrip Antenna”;IEEE Transactions on Antennas and Propagation; vol. 38, No. 6, Jun. 1990, pps 806-807.

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