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Patent Number: |
7994992 |
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Case ID: |
0 |
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Patent Title:
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Multiband current probe fed antenna
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Status: |
ACTIVE |
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Status Date: |
11/21/2011 2:17:10 PM |
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Issue Date:
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8/9/2011 |
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Filed Date:
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10/4/2007 |
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Serial #:
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1/867,046 |
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Assignee Name:
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The United States of America as represented by the Secretary of the Navy
(Washington,
DC)
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Inventor(s):
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Tam, Daniel , Schukantz, Jr., James H. , Abramo, Robert S. , Hansen, Peder , Logan, James C. , Hurdsman, David E. |
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BACKGROUND OF THE INVENTION
With increasing numbers of wireless communications systems available today more and more antennas are required to support them. In many situations the available real estate limits the number of additional antennas that may be added to a site.
For example, the area available on building rooftops, and exterior surfaces of automobiles, aircraft, and sea craft, which often serve as antenna placement locations, is particularly limited. There exists a need for a multiple-band antenna with a
relatively small footprint.
BRIEF DESCRIPTION OF THE DRAWINGS
Throughout the several views, like elements are referenced using like references.
FIG. 1 is a perspective view of the multi-band current probe antenna.
FIG. 2A shows a horizontal cross-sectional view of a current probe.
FIG. 2B shows a vertical cross-sectional view of a current probe.
FIG. 3 illustrates an operational concept of an embodiment of a curre . . . . More |
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A multi-band antenna comprising a conductive structure and a plurality of
current probes coupled around the conductive structure. Each current
probe is designed to receive and transmit in a substantially different
frequency band than the other current probes. The current probes are
positioned on the conductive structure so as to effectively create a
plurality of transmit/receive antennas such that each respective antenna
has a voltage standing wave ratio (VSWR) of less than or equal to
approximately 3:1 for a given range within each respective frequency
band.
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We claim:
1. A multi-feed, single-element, multi-band antenna comprising: a conductive structure; a plurality of current probes, each current probe comprising a magnetic core, wherein each core
has an aperture, wherein the current probes are mounted to the conductive structure without insulating chokes or traps such that a corresponding portion of the same conductive structure is positioned within each aperture such that RF energy is
transferred between the current probes and the conductive structure by way of magnetic induction; wherein each current probe has a separate feed and is designed to receive and transmit in a substantially different frequency band than the other current
probes; and wherein the current probes are positioned on the conductive structure such that the combination of the conductive structure and the current probes effectively creates a plurality of magnetic-field-coupled transmit/receive antennas such that
each respective antenna has a voltage standin . . . . More |
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