High gain antenna for wireless applications
First Claim
1. An antenna comprising:
- a ground plane;
an active antenna element adjacent said ground plane;
a plurality of passive antenna elements adjacent said ground plane and spaced apart from said active antenna element;
a plurality of first parasitic gratings adjacent said ground plane and spaced apart from said active antenna element, with each first parasitic grating being between two adjacent passive antenna elements; and
a controller for selectably controlling said plurality of passive antenna elements for operating in a reflective mode or a directive mode, said controller comprising for each respective passive antenna elementat least one impedance element connected to said ground plane, anda switch adjacent said ground plane for connecting said at least one impedance element to said passive antenna element so that said passive antenna element operates in the reflective or directive mode.
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Accused Products
Abstract
An antenna includes a ground plane and an active antenna element adjacent the ground plane. Passive antenna elements are adjacent the ground plane, and are spaced apart from the active antenna element. First parasitic gratings are adjacent the ground plane and are spaced apart from the active antenna element. Each first parasitic grating is between two adjacent passive antenna elements. A controller selectably controls the passive antenna elements for operating in a reflective mode or a directive mode. The controller includes for each respective passive antenna element at least one impedance element connected to the ground plane, and a switch adjacent the ground plane for connecting the at least one impedance element to the passive antenna element so that the passive antenna element operates in the reflective or directive mode.
236 Citations
22 Claims
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1. An antenna comprising:
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a ground plane; an active antenna element adjacent said ground plane; a plurality of passive antenna elements adjacent said ground plane and spaced apart from said active antenna element; a plurality of first parasitic gratings adjacent said ground plane and spaced apart from said active antenna element, with each first parasitic grating being between two adjacent passive antenna elements; and a controller for selectably controlling said plurality of passive antenna elements for operating in a reflective mode or a directive mode, said controller comprising for each respective passive antenna element at least one impedance element connected to said ground plane, and a switch adjacent said ground plane for connecting said at least one impedance element to said passive antenna element so that said passive antenna element operates in the reflective or directive mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An antenna comprising:
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a ground plane; an active antenna element adjacent said ground plane; a plurality of passive antenna elements spaced apart from said active antenna element, each passive antenna element comprising an upper segment adjacent said ground plane and a lower segment connected to said ground plane; and a controller for selectably controlling said plurality of passive antenna elements for operating in a reflective mode or a directive mode, said controller comprising for each respective passive antenna element a first load, a second load, and a switch for connecting said first load between the upper and lower segments so that said passive antenna element operates in the reflective mode, and for connecting said second load between the upper and lower segments so that said passive antenna element operates in the directive mode. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification