Antenna with R-card ground plane
First Claim
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1. An antenna structure comprising:
- a radiating element for receiving broadcast signals directly and, because of reflection of the signals, also indirectly with a time delay, anda ground plane for said radiating element having a central region relatively closely spaced apart from said radiating element and a peripheral region extending away from said central region, at least the peripheral region of said ground plane having a sheet resistivity that increases as radial distance from said central region increases;
whereby the signals received indirectly because of reflection are attenuated.
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Abstract
An antenna structure has a radiating element and a ground plane. The ground plane has a central region relatively closely spaced apart from the radiating element and a peripheral region extending away from the central region. At least the peripheral region of the ground plane has a sheet resistivity that increases as radial distance from the central region increases. Though physically small, the ground plane simulates an infinite ground plane, and the antenna structure reduces multipath signals caused by reflection from the earth.
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Citations
31 Claims
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1. An antenna structure comprising:
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a radiating element for receiving broadcast signals directly and, because of reflection of the signals, also indirectly with a time delay, and a ground plane for said radiating element having a central region relatively closely spaced apart from said radiating element and a peripheral region extending away from said central region, at least the peripheral region of said ground plane having a sheet resistivity that increases as radial distance from said central region increases; whereby the signals received indirectly because of reflection are attenuated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. An antenna structure comprising:
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a radiating element and a ground plane for said radiating element having a central region relatively closely spaced apart from said radiating element and a peripheral region extending away from said central region, at least the peripheral region of said ground plane having a sheet resistivity that increases as radial distance from said central region increases, wherein at least the peripheral region of said ground plane comprises a nonconductive material and a material of varying sheet resistivity supported by said nonconductive material, said material of varying sheet resistivity having maximum thickness adjacent said central region and minimum thickness at the outer edge of said peripheral region. - View Dependent Claims (27, 28)
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29. A method comprising the steps of:
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forming an antenna structure comprising; a radiating element for receiving broadcast signals directly and, because of reflection of the signals, also indirectly with a time delay, and a ground plane, wherein; the ground plane has a central region relatively closely spaced apart from the radiating element and a peripheral region extending away from the central region, and at least the peripheral region is formed of a material that has a sheet resistivity that increases as radial distance from the central region increases; and employing the antenna structure to receive the broadcast signals; whereby the signals received indirectly because of reflection are attenuated. - View Dependent Claims (30, 31)
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Specification
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Current AssigneeTrimble Navigation Limited (Trimble Inc.)
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Original AssigneeTrimble Navigation Limited (Trimble Inc.)
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InventorsWestfall, Brian G.
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Primary Examiner(s)Hajec, Donald T.
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Assistant Examiner(s)Ho, Tan
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Application NumberUS08/614,546Time in Patent Office629 DaysField of Search343/700 MS, 343/846, 343/848, 343/897, 343/713US Class Current343/700.0MSCPC Class CodesH01Q 1/38 formed by a conductive laye...H01Q 9/0407 Substantially flat resonant...
