Communications: radio wave antennas – Antennas – Wave guide type
Reexamination Certificate
2006-07-28
2009-12-29
Lee, Benny (Department: 2817)
Communications: radio wave antennas
Antennas
Wave guide type
C343S909000, C333S157000, C333S159000
Reexamination Certificate
active
07639197
ABSTRACT:
A dual-band stacked electromagnetic band gap (EBG) electronically scanned array (ESA) has a first aperture with a waveguide element spacing of less than λ/2 and a length to provide about 360° of upper frequency phase shift. A second aperture is stacked on the first aperture and has an element spacing of less than λ/2 at a lower frequency and a length such that when summed with the first aperture length about 360° of lower-frequency phase shift is provided. The second aperture comprises metal slats perpendicular to EBG slats to form an equivalent waveguide element with a broadwall dimension to support a TE10mode at the upper frequency. The second aperture may also comprise metal slats and alternating frequency selective surface (FSS) slats with perpendicular EBG slats lengthening the broadwall at the upper frequency. The EBG slats provide lower-frequency phase shifting in both embodiments.
REFERENCES:
patent: 6756866 (2004-06-01), Higgins
patent: 6822617 (2004-11-01), Mather et al.
patent: 6950062 (2005-09-01), Mather et al.
patent: 7151507 (2006-12-01), Herting
“Characteristics of Ka Band Waveguide Using Electromagnetic Crystal Sidewalls”, by J. A. Higgins et al., 2002 IEEE MTT-S International Microwave Symposium, Seattle, WA, Jun. 2002.
“A Dual-Frequency Band Waveguid Using FSS”, R. J. Langley, IEEE Microwave and Guided Wave Letters, vol. 3, No. 1, Jan. 1993.
U.S. Appl. No. 11/154,256, filed on Jun. 16, 2005, entitled “Low-Loss, Dual-Band Electronmagnetic Band Gap Electronically Scanned Antenna Utilizing Frequency Selective Surfaces” by Brian J. Herting.
Barbieri Daniel M.
Evans Matthew J.
Lee Benny
Rockwell Collins, Inc.
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