Compact antenna system
First Claim
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1. An antenna system having an antenna axis, the antenna system comprising:
- a substantially flat ground plane having a first surface, a second surface, a perimeter, and a normal axis, wherein the normal axis is substantially coincident with the antenna axis;
an active antenna comprising;
a first conducting ring, wherein;
the first conducting ring is substantially parallel to the first surface;
the first conducting ring is spaced apart from the first surface; and
the first conducting ring has a first center, wherein the first center is disposed substantially on the antenna axis;
a first radiating conductor having a first end and a second end, wherein;
the first end is electrically connected to a first point on the first conducting ring;
the second end is electrically connected to a second point on the first conducting ring; and
the first radiating conductor passes through substantially the first center;
an excitation pin electrically connected to the first radiating conductor; and
a first set of reactive impedance elements, wherein, for each reactive impedance element in the first set of reactive impedance elements;
the reactive impedance element is substantially parallel to the antenna axis;
the reactive impedance element has a first termination and a second termination;
the first termination is electrically connected to the first conducting ring;
the second termination is electrically connected to the first surface;
the first termination of any one reactive impedance element is spaced apart from the first termination of any other reactive impedance element; and
the second termination of any one reactive impedance element is spaced apart from the second termination of any other reactive impedance element; and
a passive antenna comprising;
a second conducting ring, wherein;
the second conducting ring is substantially parallel to the second surface;
the second conducting ring is spaced apart from the second surface; and
the second conducting ring has a second center, wherein the second center is disposed substantially on the antenna axis;
a second radiating conductor having a third end and a fourth end, wherein;
the third end is electrically connected to a third point on the second conducting ring;
the fourth end is electrically connected to a fourth point on the second conducting ring; and
the second radiating conductor passes through substantially the second center; and
a second set of reactive impedance elements, wherein, for each reactive impedance element in the second set of reactive impedance elements;
the reactive impedance element is substantially parallel to the antenna axis;
the reactive impedance element has a third termination and a fourth termination;
the third termination is electrically connected to the second conducting ring;
the fourth termination is electrically connected to the second surface;
the third termination of any one reactive impedance element is spaced apart from the third termination of any other reactive impedance element; and
the fourth termination of any one reactive impedance element is spaced apart from the fourth termination of any other reactive impedance element.
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Abstract
An antenna system for global navigation satellite systems includes a ground plane, an active antenna disposed above the ground plane, and a passive antenna disposed below the ground plane. The active antenna includes a conducting ring substantially parallel to the ground plane. A radiating conductor passes through substantially the center of the conducting ring; the ends of the radiating conductor are electrically connected to the conducting ring. An excitation pin is electrically connected to the radiating conductor. A set of reactive impedance elements is electrically connected between the conducting ring and the ground plane. The set of reactive impedance elements is disposed substantially orthogonal to the ground plane. The passive antenna is similar to the active antenna, except the passive antenna does not have an excitation pin. The antenna system effectively suppresses multipath reception, and its compact size and light weight make it suitable for integration with a surveying pole.
10 Citations
51 Claims
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1. An antenna system having an antenna axis, the antenna system comprising:
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a substantially flat ground plane having a first surface, a second surface, a perimeter, and a normal axis, wherein the normal axis is substantially coincident with the antenna axis; an active antenna comprising; a first conducting ring, wherein; the first conducting ring is substantially parallel to the first surface; the first conducting ring is spaced apart from the first surface; and the first conducting ring has a first center, wherein the first center is disposed substantially on the antenna axis; a first radiating conductor having a first end and a second end, wherein; the first end is electrically connected to a first point on the first conducting ring; the second end is electrically connected to a second point on the first conducting ring; and the first radiating conductor passes through substantially the first center; an excitation pin electrically connected to the first radiating conductor; and a first set of reactive impedance elements, wherein, for each reactive impedance element in the first set of reactive impedance elements; the reactive impedance element is substantially parallel to the antenna axis; the reactive impedance element has a first termination and a second termination; the first termination is electrically connected to the first conducting ring; the second termination is electrically connected to the first surface; the first termination of any one reactive impedance element is spaced apart from the first termination of any other reactive impedance element; and the second termination of any one reactive impedance element is spaced apart from the second termination of any other reactive impedance element; and a passive antenna comprising; a second conducting ring, wherein; the second conducting ring is substantially parallel to the second surface; the second conducting ring is spaced apart from the second surface; and the second conducting ring has a second center, wherein the second center is disposed substantially on the antenna axis; a second radiating conductor having a third end and a fourth end, wherein; the third end is electrically connected to a third point on the second conducting ring; the fourth end is electrically connected to a fourth point on the second conducting ring; and the second radiating conductor passes through substantially the second center; and a second set of reactive impedance elements, wherein, for each reactive impedance element in the second set of reactive impedance elements; the reactive impedance element is substantially parallel to the antenna axis; the reactive impedance element has a third termination and a fourth termination; the third termination is electrically connected to the second conducting ring; the fourth termination is electrically connected to the second surface; the third termination of any one reactive impedance element is spaced apart from the third termination of any other reactive impedance element; and the fourth termination of any one reactive impedance element is spaced apart from the fourth termination of any other reactive impedance element. - 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, 26, 27, 28)
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29. A dual-frequency band antenna system having an antenna axis, the antenna system comprising:
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a substantially flat ground plane having a first surface, a second surface, a perimeter, and a normal axis, wherein the normal axis is substantially coincident with the antenna axis; a first active antenna comprising; a first conducting ring, wherein; the first conducting ring is substantially parallel to the first surface; the first conducting ring is spaced apart from the first surface; the first conducting ring has a first center, wherein the first center is disposed substantially on the antenna axis; and the first conducting ring has a first lateral dimension; a first radiating conductor having a first end and a second end, wherein; the first end is electrically connected to a first point on the first conducting ring; the second end is electrically connected to a second point on the first conducting ring; and the first radiating conductor passes through substantially the first center; a first excitation pin electrically connected to the first radiating conductor; and a first set of reactive impedance elements, wherein, for each reactive impedance element in the first set of reactive impedance elements; the reactive impedance element is substantially parallel to the antenna axis; the reactive impedance element has a first termination and a second termination; the first termination is electrically connected to the first conducting ring; the second termination is electrically connected to the first surface; the first termination of any one reactive impedance element is spaced apart from the first termination of any other reactive impedance element; and the second termination of any one reactive impedance element is spaced apart from the second termination of any other reactive impedance element; a second active antenna comprising; a second conducting ring, wherein; the second conducting ring is substantially parallel to the first surface; the second conducting ring has a second center, wherein the second center is disposed substantially on the antenna axis; the second conducting ring has a second lateral dimension, wherein the second lateral dimension is less than the first lateral dimension; and the second conducting ring is electrically connected to the first radiating conductor; a third conducting ring, wherein; the third conducting ring is substantially parallel to the first surface; the third conducting ring is spaced apart from the second conducting ring; the third conducting ring has a third center, wherein the third center is disposed substantially on the antenna axis; and the third conducting ring has a third lateral dimension, wherein the third lateral dimension is substantially equal to the second lateral dimension; a second radiating conductor having a third end and a fourth end, wherein; the third end is electrically connected to a third point on the third conducting ring; the fourth end is electrically connected to a fourth point on the third conducting ring; the second radiating conductor passes through substantially the third center; and the second radiating conductor is substantially parallel to the first radiating conductor; a second excitation pin electrically connected to the second radiating conductor; and a second set of reactive impedance elements, wherein, for each reactive impedance element in the second set of reactive impedance elements; the reactive impedance element is substantially parallel to the antenna axis; the reactive impedance element has a third termination and a fourth termination; the third termination is electrically connected to the third conducting ring; the fourth termination is electrically connected to the second conducting ring; the third termination of any one reactive impedance element is spaced apart from the third termination of any other reactive impedance element; and the fourth termination of any one reactive impedance element is spaced apart from the fourth termination of any other reactive impedance element; a first passive antenna comprising; a fourth conducting ring, wherein; the fourth conducting ring is substantially parallel to the first surface; the fourth conducting ring is spaced apart from the second surface; the fourth conducting ring has a fourth center, wherein the fourth center is disposed substantially on the antenna axis; and the fourth conducting ring has a fourth lateral dimension; a third radiating conductor having a fifth end and a sixth end, wherein; the fifth end is electrically connected to a fifth point on the fourth conducting ring; the sixth end is electrically connected to a sixth point on the fourth conducting ring; and the third radiating conductor passes through substantially the fourth center; and a third set of reactive impedance elements, wherein, for each reactive impedance element in the third set of reactive impedance elements; the reactive impedance element is substantially parallel to the antenna axis; the reactive impedance element has a fifth termination and a sixth termination; the fifth termination is electrically connected to the fourth conducting ring; the sixth termination is electrically connected to the second surface; the fifth termination of any one reactive impedance element is spaced apart from the fifth termination of any other reactive impedance element; and the sixth termination of any one reactive impedance element is spaced apart from the sixth termination of any other reactive impedance element; and a second passive antenna comprising; a fifth conducting ring, wherein; the fifth conducting ring is substantially parallel to the second surface; the fifth conducting ring has a fifth center, wherein the fifth center is disposed substantially on the antenna axis; the fifth conducting ring has a fifth lateral dimension, wherein the fifth lateral dimension is less than the fourth lateral dimension; and the fourth conducting ring is electrically connected to the third radiating conductor; a sixth conducting ring, wherein; the sixth conducting ring is substantially parallel to the second surface; the sixth conducting ring is spaced apart from the fifth conducting ring; the sixth conducting ring has a sixth center, wherein the sixth center is disposed substantially on the antenna axis; and the sixth conducting ring has a sixth lateral dimension, wherein the sixth lateral dimension is substantially equal to the fifth lateral dimension; a fourth radiating conductor having a seventh end and an eighth end, wherein; the seventh end is electrically connected to a seventh point on the sixth conducting ring; the eighth end is electrically connected to an eighth point on the sixth conducting ring; the fourth radiating conductor passes through substantially the sixth center; and the fourth radiating conductor is substantially parallel to the third radiating conductor; and a fourth set of reactive impedance elements, wherein, for each reactive impedance element in the fourth set of reactive impedance elements; the reactive impedance element is substantially parallel to the antenna axis; the reactive impedance element has a seventh termination and an eighth termination; the seventh termination is electrically connected to the sixth conducting ring; the eighth termination is electrically connected to the fifth conducting ring; the seventh termination of any one reactive impedance element is spaced apart from the seventh termination of any other reactive impedance element; and the eighth termination of any one reactive impedance element is spaced apart from the eighth termination of any other reactive impedance element. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51)
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Specification
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Current AssigneeTopcon Positioning Systems Incorporated (Topcon Corporation)
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Original AssigneeTopcon Positioning Systems Incorporated (Topcon Corporation)
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InventorsTatarnikov, Dmitry Vitalievich, Astakhov, Andrey Vitalievich, Shamatulskiy, Pavel Petrovich
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Primary Examiner(s)YOUNG, BRIAN K
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Application NumberUS14/343,995Publication NumberTime in Patent Office1,209 DaysField of Search343/749, 343/729, 343/730, 343/829, 343/833US Class Current1/1CPC Class CodesH01Q 1/1242 Rigid masts specially adapt...H01Q 19/00 Combinations of primary act...H01Q 23/00 Antennas with active circui...H01Q 5/328 between a radiating element...H01Q 5/40 Imbricated or interleaved s...H01Q 9/0464 Annular ring patch
