Broad band and multi-band antennas
First Claim
1. An antenna system comprising:
- a dielectric resonator antenna characterized by;
a surface area, A;
a volume, V; and
a quantity A*λ
/V that is at least about 50, where λ
is a free space wavelength corresponding to a center frequency of a lowest order mode of the dielectric resonator antenna.
2 Assignments
0 Petitions
Accused Products
Abstract
Antenna systems (200, 1300, 1500, 1900, 2000, 2400) comprise a dielectric resonator antenna (210) in the shape of a parallelepiped with right angle corners. The thickness (T) of the dielectric resonator antenna (210) is chosen to be less than the length and height. The antenna systems (200, 1300, 1500, 1900, 2000, 2400) provide have broad band response that is attributed to two or more resonant modes that have center frequencies that are closely spaced in frequency relative to their bandwidths. Additional pass bands can be obtained by placing a conductive strip (1302) along an edge of the dielectric resonator 210. The passband associated with the conductive strip (1302) can be lowered in frequency by capacitively loading the conductive strip (1302). An additional passband can also be obtained by coupling a metal ribbon (2012) to a feed in microstrip (206, 2002) and to the dielectric resonator antenna (210).
45 Citations
36 Claims
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1. An antenna system comprising:
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a dielectric resonator antenna characterized by;
a surface area, A;
a volume, V; and
a quantity A*λ
/V that is at least about 50,where λ
is a free space wavelength corresponding to a center frequency of a lowest order mode of the dielectric resonator antenna.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
the quantity A*λ
/V is at least about 100.
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3. The antenna system according to claim 1 wherein the dielectric resonator antenna has a dielectric constant of at least about 25.
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4. The antenna system according to claim 3 wherein the dielectric resonator antenna has a dielectric constant of at least about 40.
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5. The antenna system according to claim 4 wherein:
the dielectric resonator antenna is made from material selected from the group consisting of;
Neodymium Titanate and Magnesium Calcium Titanate.
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6. The antenna system according to claim 1 wherein:
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The dielectric resonator antenna includes;
a first large area surface;
a second large area surface; and
is further characterized by;
a thickness T measured between the first large area surface and the second large area surface;
a height, H; and
a length, L.
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7. The antenna system according to claim 6 wherein:
a ratio of the length of the dielectric resonator antenna to the thickness of the dielectric resonator antenna is at least about 10.
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8. The antenna system according to claim 7 wherein:
the height of the dielectric resonator antenna is between about ¼ and
one times the length of the dielectric resonator antenna.
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9. The antenna system according to claim 8 wherein:
the dielectric resonator antenna is right parallelepiped in shape.
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10. The antenna system according to claim 1 further comprising:
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a first edge extending between the first large area surface and the second large area surface; and
a microstrip arranged parallel to and adjacent to the first edge.
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11. The antenna system according to claim 10 further comprising:
a spacer layer located between the microstrip and the first edge of the dielectric resonator antenna.
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12. The antenna system according to claim 11 wherein:
the spacer layer comprises a material selected from the group consisting of polytetrafluoroethylene, air, and paper.
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13. The antenna system according to claim 11 wherein:
the spacer layer has a thickness of between about 50 and 500 microns, and a dielectric constant of less than about 4.
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14. The antenna system according to claim 1 further comprising:
a conductive shield that has a width measured parallel to the thickness of the dielectric resonator antenna that is equal to at least about 0.95 times the height of the dielectric resonator antenna.
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15. The antenna system according to claim 14 wherein:
the width of the conductive shield is less than about 3.5 times the height of the dielectric resonator antenna.
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16. The antenna system according to claim 14 wherein:
the conductive shield comprises a microstrip ground plane.
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17. An antenna system comprising:
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a dielectric resonator antenna including;
a first large area surface;
a second large area surface opposite to the first large area surface; and
a first edge that extends between the first large area surface and the second large area surface;
a parasitic element positioned along the first edge; and
a signal feed for coupling signals to and from the dielectric resonator antenna. - View Dependent Claims (18, 19)
the parasitic element comprises a first metal strip including a first end.
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20. The antenna system according to 19 wherein:
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the dielectric resonator antenna further comprises;
a second edge that extends between the first large area surface and the second large area surface; and
the signal feed comprises;
a microstrip that is arranged parallel to and adjacent to the second edge. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27)
a capacitive coupling element that capacitively couples the first metal strip and the microstrip.
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22. The antenna system according to claim 21 wherein:
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the capacitive coupling element comprises;
a second metal strip that extends from the first metal strip over the first large area surface toward the microstrip.
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23. The antenna system according to claim 20 wherein:
the first edge is opposite to the second edge.
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24. The antenna system according to claim 23 wherein:
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the dielectric resonator antenna is a parallelepiped characterized by;
a height measured between the first edge, and the second edge;
a resonator length corresponding to a length of the first edge; and
a thickness measured between the first large area surface and the second large area surface; and
a ratio of the height to the resonator length is more than about 0.5.
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25. The antenna system according to claim 24 wherein:
the dielectric resonator antenna has a dielectric constant of at least about twenty-five.
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26. The antenna system according to claim 25 further comprising:
a spacer layer that has a dielectric constant that is less than about 4 located between the dielectric resonator antenna and the microstrip.
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27. The antenna system according to claim 26 wherein:
the spacer layer has a thickness of between 50 and 500 microns.
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28. A antenna system comprising:
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a dielectric resonator antenna;
a transmission line electromagnetically coupled to the dielectric resonator antenna;
a conductor including;
a first end positioned proximate the dielectric resonator antenna; and
a second end; and
an electromagnetic coupling for coupling the second end to the transmission line. - View Dependent Claims (29, 30)
a first large area surface;
a second large area surface opposite to the first large area surface; and
a first edge that extends between the first large area surface and the second large area surface; and
the dielectric resonator antenna is characterized by a height dimension measured along the first large area surface in a direction perpendicular to the first edge.
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30. The antenna system according to claim 29 wherein the transmission line comprises:
a microstrip that is positioned adjacent to and parallel to the first edge.
- 31. The antenna system according to 29 wherein the electromagnetic coupling comprises a capacitive coupling.
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36. An antenna system comprising:
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a ground plane;
a circuit substrate including an obverse side and a reverse side that includes a first area covered by the ground plane and a second area that is not covered by the ground plane;
a dielectric resonator antenna supported on the obverse side, over the clear area, the dielectric resonator antenna including an edge, the dielectric resonator antenna being characterized by;
a surface area A, a volume V, a quanity A*λ
/V that is at least about 50, where λ
is a free space wavelenght associated with a lowest order mode of the dielectric resonator antenna; and
a microstrip on the obverse side, the microstrip including an end segment parallel to and proximate to the edge.
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Specification