Loop antenna and feed coupler for reduced interaction with tuning adjustments
First Claim
1. A printed circuit antenna with broadband input coupling, comprising:
- a dielectric substrate disposed on a conductive ground plane;
an elongated conductive antenna element arranged in the form of a loop and disposed on said substrate, said antenna element having first and second adjacent end portions separated by a gap, said second end portion connected to said ground plane;
an input coupler, said input coupler comprising a conductive line disposed on said substrate adjacent to said antenna element and separated from said antenna element by a coupling space for coupling to said antenna element an input signal applied to said input coupler, said conductive line extending parallel to a portion of said antenna element.
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Accused Products
Abstract
A printed circuit antenna with broadband input coupling is disclosed. An elongated conductive antenna element arranged in the form of a loop is disposed on a dielectric substrate formed on a ground plane. The antenna element has first and second adjacent end portions separated by a gap. The second end portion is connected to the ground plane. An input coupler is provided for matching an input impedance of the antenna to the antenna feed circuitry. The input coupler can comprise a conductive line disposed on the substrate adjacent to the antenna element. The conductive line is separated from the antenna element by a coupling space for coupling to the antenna element an input signal applied to the input coupler. The conductive line extends parallel to a portion of the antenna element including the first end portion. The arrangement has the advantage of having an input impedance that is relatively insensitive to adjustments affecting the antenna center frequency.
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Citations
13 Claims
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1. A printed circuit antenna with broadband input coupling, comprising:
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a dielectric substrate disposed on a conductive ground plane;
an elongated conductive antenna element arranged in the form of a loop and disposed on said substrate, said antenna element having first and second adjacent end portions separated by a gap, said second end portion connected to said ground plane;
an input coupler, said input coupler comprising a conductive line disposed on said substrate adjacent to said antenna element and separated from said antenna element by a coupling space for coupling to said antenna element an input signal applied to said input coupler, said conductive line extending parallel to a portion of said antenna element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A printed circuit antenna with broadband input coupling, comprising:
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a dielectric substrate disposed on a conductive ground plane;
an elongated conductive antenna element arranged in the form of a loop and disposed on said substrate, said antenna element having first and second adjacent end portions separated by a gap, said second end portion connected to said ground plane;
an input coupler, said input coupler comprising a conductive line disposed on said substrate adjacent to said antenna element and separated from said antenna element by a coupling space for coupling to said antenna element an input signal applied to said input coupler, said conductive line extending along a portion of said antenna element including said first end portion; and
wherein a first region of said substrate comprising said coupling space has a permittivity that is larger than the permittivity of a second region of said substrate on which is disposed said antenna element. - View Dependent Claims (10, 11, 12, 13)
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Specification