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Antenna, antenna device, and wireless device

  • US 9,905,919 B2
  • Filed: 12/07/2015
  • Issued: 02/27/2018
  • Est. Priority Date: 06/21/2013
  • Status: Active Grant
First Claim
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1. An antenna, comprising:

  • a feeding element connected to a feeding point;

    a first radiating element spaced apart from the feeding element by a distance set such that the first radiating element is coupled to the feeding element through electromagnetic field coupling and establishes noncontact feeding via the feeding element;

    a second radiating element spaced apart from the feeding element by a distance set such that the second radiating element is coupled to the feeding element through electromagnetic field coupling and establishes noncontact feeding via the feeding element;

    a first control element connected to the feeding element via a first impedance variable unit and positioned such that when the first impedance variable unit decreases an impedance at a resonant frequency of the first radiating element, the electromagnetic field coupling between the feeding element and the first radiating element is weakened and a radiating conductor function of the first radiating element is degraded; and

    a second control element connected to the feeding element via a second impedance variable unit and positioned such that when the second impedance variable unit decreases an impedance at a resonant frequency of the second radiating element, the electromagnetic field coupling between the feeding element and the second radiating element is weakened and a radiating conductor function of the second radiating element is degraded,wherein the first impedance variable unit comprises circuitry configured to adjust connection between the feeding element and the first control element, the second impedance variable unit comprises circuitry configured to adjust connection between the feeding element and the second control element, in a dipole mode, a feeding portion of each of the first radiating element and the second radiating element at which the feeding element feeds the first radiating element or the second radiating element is located at a first region spaced apart from a lowest impedance portion of the first radiating element or the second radiating element by a distance greater than or equal to ⅛

    of a total length of the first radiating element or the second radiating element;

    in a monopole mode, the feeding portion is located at a second region spaced apart from the lowest impedance portion of the first radiating element or the second radiating element by a distance greater than or equal to ¼

    of the total length of the first radiating element or the second radiating element; and

    in a loop mode, the feeding portion is located at a third region spaced apart from a highest impedance portion of the first radiating element or the second radiating element by a distance less than or equal to 3/16 of an inner circumference of a loop formed by the first radiating element or the second radiating element.

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