Communications: radio wave antennas – Antennas – Microstrip
Reexamination Certificate
2006-02-07
2006-02-07
Phan, Tho (Department: 2821)
Communications: radio wave antennas
Antennas
Microstrip
Reexamination Certificate
active
06995709
ABSTRACT:
A miniaturized, circularly polarized SDS patch antenna. Generally, the inventive antenna includes a ground plane over which a first patch is disposed. A short is provided between a first edge of the first patch and ground plane. A second patch is disposed over said first patch. A second short is provided between a first edge of the second patch and the first patch. The patch antenna of the illustrative embodiment further includes a first volume of dielectric disposed between the ground plane and the first patch. A second volume of dielectric is disposed between the first patch and the second patch. In the illustrative embodiment, the edges are shorted orthogonally. In an alternative embodiment, the shorted edges are in substantially parallel alignment. In yet another alternative embodiment, the antenna is designed for dual frequency operation. In the best mode, the area of the first patch is greater than the area of the second patch. In the illustrative application, high dielectric substrates and vertical shorting walls are combined to implement a compact circularly polarized patch antenna for use in low frequency applications. Two different high dielectric substrates are utilized to achieve a compact footprint with a stacked structure. The use of vertical shorting walls affords a substantial reduction in size while providing quarter-wave operation in both orthogonal directions. The coaxial feed position on the diagonal effects a rotation of the fields in a circular manner from the upper layer to lower layer.
REFERENCES:
patent: 4070676 (1978-01-01), Sanford
patent: 4162499 (1979-07-01), Jones et al.
patent: 4783661 (1988-11-01), Smith
patent: 5703601 (1997-12-01), Nalbandian et al.
patent: 5917450 (1999-06-01), Tsunekawa et al.
patent: 5986606 (1999-11-01), Kossiavas et al.
A. Hoorfar, A. Perrotta, “An Experimental Study of Microstrip Antennas on Very High Permittivity Ceramic Substrate and Very Small Ground Planes”, Electronic Letters, vol. 49, No. 4, Apr. 2001, pp. 838-840.
K.F. Lee, Y.X. Guo, J.A. Hawkins, R. Chair, K.M. Luk, “Theory and experiment on microstrip patch antennas withshorting walls”, IEE Proceedings—Microwave and Antennas Propagation, vol. 147, No. 6, Dec. 2000, pp. 521-525.
M. Lech, A. Mitchell, R. Waterhouse “Optimization of Broadband Microstrip Patch Antennas”, Microwave Conference, 2000 Asia-Pacific, pp. 711-714.
L.L. Shafai, W.A. Chamma, M. Barakat, P.C. Strickland, G. Seguin “Dual-Band Dual-Polarized Perforated Microstrip Antennas for SAR Applications”, IEEE Transactions on Antennas and Propagation, vol. 48, No. 1, Jan. 2000, pp. 58-66.
Alkov Leonard A.
Phan Tho
Raytheon Company
Vick Karl A.
LandOfFree
Compact stacked quarter-wave circularly polarized SDS patch... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Compact stacked quarter-wave circularly polarized SDS patch..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Compact stacked quarter-wave circularly polarized SDS patch... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3626411