Low-loss, dual-band electromagnetic band gap electronically...

Communications: radio wave antennas – Antennas – Antenna components

Reexamination Certificate

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C343S778000

Reexamination Certificate

active

07151507

ABSTRACT:
A dual-band electromagnetic band gap (EBG) electronically scanned antenna utilizing frequency selective surfaces (FSS) uses FSS waveguide phase shifters. Each FSS waveguide phase shifter has a low-frequency phase shifter with low-frequency EBG devices on vertical waveguide walls, horizontal waveguide broadwalls that are substantially twice the width of the vertical waveguide walls and an FSS located at the center of the horizontal waveguide broadwalls. Two high-frequency phase shifters are formed within the low-frequency phase shifter. Each high-frequency phase shifter comprises a vertical waveguide wall, the FSS, half of the horizontal waveguide broadwalls, and high-frequency EBG devices located on each half of the horizontal waveguide broadwalls, The FSS is transparent at a low frequency and opaque at a high frequency.

REFERENCES:
patent: 6756866 (2004-06-01), Higgins
patent: 6806846 (2004-10-01), West
patent: 6822617 (2004-11-01), Mather et al.
patent: 6822622 (2004-11-01), Crawford et al.
“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.
U.S. Appl. No. 10/458,481, filed on Jun. 10, 1993 entitled “One-Dimensional and Two Dimensional Electronically Scanned Slotted Waveguide Antennas Using Tunable Band Gap Surfaces” by James B. West et al.
U.S. Appl. No. 10/273,459, filed on Oct. 18, 2002 entitled “A Method and Structure for Phased Array Antenna Interconnect” by John C. Mather et al.
U.S. Appl. No. 10/698,774, filed on Oct. 31, 2003, entitled “Independently Controlled Dual-Mode Analog Waveguide Phase Shifter” by James B. West et al.
U.S. Appl. No. 10/699,514, filed on Oct. 31, 2003, entitled “A Dual-Band Multibeam Waveguide Phased Array” by James B. West et al.
“A Dual-Frequency Band Waveguide Using FSS”, R. J. Langley, IEEE Microwave and Guided Wave Letters, vol. 3, No. 1, Jan. 1993.

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