Antenna with stepped ground plane
First Claim
Patent Images
1. An antenna structure comprising:
- a radiating element anda ground plane for the radiating element having a central region closely spaced apart from the radiating element and a peripheral region extending away from the central region, wherein;
the peripheral region comprises a conductive layer that provides a sheet resistivity higher than that of the radiating element and extends radially beyond the radiating element and the ground plane has a sheet resistivity less than 3 ohms per square measured from dead center to the periphery of the radiating element and a sheet resistivity at least as high as that of free space measured at the periphery of the ground plane.
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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. The peripheral region comprises at least one conductive layer that extends radially beyond the radiating element and provides a sheet resistivity higher than that of the radiating element. 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
50 Claims
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1. An antenna structure comprising:
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a radiating element and a ground plane for the radiating element having a central region closely spaced apart from the radiating element and a peripheral region extending away from the central region, wherein; the peripheral region comprises a conductive layer that provides a sheet resistivity higher than that of the radiating element and extends radially beyond the radiating element and the ground plane has a sheet resistivity less than 3 ohms per square measured from dead center to the periphery of the radiating element and a sheet resistivity at least as high as that of free space measured at the periphery of the ground plane.
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2. An antenna structure comprising:
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a radiating element and a ground plane for the radiating element having a central region closely spaced apart from the radiating element and a peripheral region extending away from the central region, wherein; the peripheral region comprises a first conductive layer that provides a sheet resistivity of a first value and a second conductive layer that extends radially beyond the first conductive layer to provide a sheet resistivity of a second value higher than the first value, and the ground plane has a sheet resistivity less than 3 ohms per square measured from dead center to the periphery of the radiating element and a sheet resistivity at least as high as that of free space measured at the periphery of the ground plane. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An antenna structure comprising:
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a radiating element and a ground plane for the radiating element having a central region closely spaced apart from the radiating element and a peripheral region extending away from the central region, wherein; the peripheral region comprises first and second conductive layers that in part overlap to provide a sheet resistivity of a first value, the second conductive layer extends radially beyond the first conductive layer to provide a sheet resistivity of a second value higher than the first value, and the ground plane has a sheet resistivity less than 3 ohms per square measured from dead center to the periphery of the radiating element and a sheet resistivity at least as high as that of free space measured at the periphery of the ground plane. - View Dependent Claims (23, 24, 25, 26, 27, 28, 47)
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29. An antenna structure comprising:
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a radiating element and a ground plane for the radiating element having a central region closely spaced apart from the radiating element and a peripheral region extending away from the central region, wherein; the peripheral region comprises first, second and third conductive layers that in part overlap to provide a sheet resistivity of a first value, the second and third conductive layers extend radially beyond the first conductive layer and in part overlap to provide a sheet resistivity of a second value higher than the first value, and the third conductive layer extends radially beyond the second conductive layer to provide a sheet resistivity of a third value higher than the second value. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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44. An antenna structure comprising:
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a radiating element and a ground plane for the radiating element having a central region closely spaced apart from the radiating element and a peripheral region extending away from the central region, wherein; the peripheral region comprises first and second conductive layers that in part overlap to provide a sheet resistivity of a first value, and the second conductive layer extends radially beyond the first conductive layer to provide a sheet resistivity of a second value higher than the first value; and
the ground plane has a sheet resistivity less than 3 ohms per square measured from dead center to the periphery of the radiating element and a sheet resistivity at least as high as that of free space measured at the periphery of the ground plane;
further comprisinga mount connected to and supporting the second conductive layer, a first separating layer between the first and second conductive layers, and a second separating layer between the second conductive layer and the mount.
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45. An antenna structure comprising:
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a radiating element and a ground plane for the radiating element having a central region closely spaced apart from the radiating element and a peripheral region extending away from the central region, wherein; the peripheral region comprises first and second conductive layers that in part overlap to provide a sheet resistivity of a first value, and the second conductive layer extends radially beyond the first conductive layer to provide a sheet resistivity of a second value higher than the first value;
further comprisinga mount connected to and supporting the second conductive layer, a first separating layer between the first and second conductive layers, and a second separating layer between the second conductive layer and the mount; wherein the first and second conductive layers are respectively formed as first and second disks each having a central aperture. - View Dependent Claims (46)
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48. 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 closely spaced apart from the radiating element and a peripheral region extending away from the central region, the peripheral region comprises a first conductive layer that provides a sheet resistivity higher than that of the radiating element and extends radially beyond the radiating element; and the ground plane has a sheet resistivity less than 3 ohms per square measured from dead center to the periphery of the radiating element and a sheet resistivity at least as high as that of free space measured at the periphery of the ground plane; and employing the antenna structure to receive the broadcast signals; whereby the signals received indirectly because of reflection are attenuated. - View Dependent Claims (49, 50)
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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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InventorsStephenson, Kevin B., Westfall, Brian G.
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Primary Examiner(s)Vu, David H.
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Assistant Examiner(s)NGUYEN, HOANG V
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Application NumberUS08/934,249Time in Patent Office844 DaysField of Search343/700 MS, 343/846, 343/848, 343/829US Class Current343/846CPC Class CodesH01Q 1/48 Earthing means; Earth scree...H01Q 9/0407 Substantially flat resonant...
