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US 4,063,250 AGranted
Beam and null switch step steerable antenna system
AssigneeElectrospace Systems, Inc.
InventorRichard C. Fenwick
Life of this patent
Estimating the term…
Abstract
An antenna combiner 2.sup.n antenna element system with switchable variable delay line length broadband beam and null steering through 360.degree. in azimuth.
Claims20
In a switch step steerable multi-element antenna array:
- 2.sup.n antenna elements;
- combiner means including a hybrid transformer having a sum port, a difference port and two coupled ports connectable to a radio frequency device, and having two transmission lines each connected to a respective coupled port and half of the 2.sup.n antenna elements;
- and switchable variable delay line length control means in at least one of said two transmission lines for electromagnetic radiation frequency signal step steering;
- wherein a plurality of delay line segments are included in said switchable variable delay line length control means;
- switch control means for switching each of said delay line segments into and out of a transmission line;
- and control structure means interconnecting the switch control means of the delay line segments of a transmission line;
- and azimuth calibration means in said control structure means;
- and wherein said hybrid transformer means includes switch means for switch interchanging the connection to said radio frequency device and connection of said hybrid difference port or sum port for switching the antenna array between switchable delay line beam and null steering.
5 more elements
In a switch step steerable multi-element antenna array:
- 2.sup.n antenna elements;
- combiner means including a hybrid transformer having a sum port, a difference port and two coupled ports connectable to a radio frequency device, and having two transmission lines each connected to a respective half of the 2.sup.n antenna elements;
- and switchable variable delay line length control means in at least one of said two transmission lines for electromagnetic radiation frequency signal step steering;
- wherein a plurality of delay line segments are included in said switchable variable delay line length control means;
- switch control means for switching each of said delay line segments into and out of a transmission line;
- and control structure means interconnecting the switch control means of the delay line segments of a transmission line;
- and azimuth calibration means in said control structure means wherein three delay line segments are provided as the plurality of delay line segments in said switchable variable delay line length control means for being switched into and out of a transmission line;
- and with the three delay line segments having lengths L.sub.1, L.sub.2 and L.sub.3, substantially conforming to the binary relationship L.sub.3 =2L.sub.2 =4L.sub.1.
5 more elements
In a switch step steerable multi-element antenna array:
- 2.sup.n antenna elements;
- combiner means including a hybrid transformer having a sum port, a difference port and two coupled ports connectable to a radio frequency device, and having two transmission lines each connected to a respective half of the 2.sup.n antenna elements;
- and switchable variable delay line length control means in at least one of said two transmission lines for electromagnetic radiation frequency signal step steering;
- wherein a plurality of delay line segments are included in said switchable variable delay line length control means;
- switch control means for switching each of said delay line segments into and out of a transmission line;
- and control structure means interconnecting the switch control means of the delay line segments of a transmission line;
- and azimuth calibration means in said control structure means wherein at least two delay line segments are provided as the plurality of delay line segments in said switchable variable delay line length control means for being switched into and out of a transmission line;
- and with the delay line segments having lengths L.sub.2, L.sub.2. . . L.sub.n substantially conforming to the binary relationship L.sub.n 32 2L.sub.n-1 32 4L.sub.n-2. . . .
5 more elements
Dependencies are inferred from the claim text.