Communications: radio wave antennas – Antennas – With grounding structure
Reexamination Certificate
2007-02-20
2007-02-20
Ho, Tan (Department: 2821)
Communications: radio wave antennas
Antennas
With grounding structure
C343S7000MS, C343S773000
Reexamination Certificate
active
10498518
ABSTRACT:
An unbalanced antenna having a radiation conductor and a ground conductor provided with a predetermined gap therebetween is provided. At least a predetermined part of the ground conductor, the predetermined part being opposed to the radiation conductor, is left so that it keeps functioning as a pole for forming a near electromagnetic-field distribution together with the radiation conductor opposed to the ground conductor. Further, a part of the reduced ground conductor, the part being near an end at a predetermined distance from the feed section, includes a conductor having low conductivity for obtaining impedance matching. Where the ground conductor is significantly reduced, mode mismatch inevitably occurs. Therefore, at least one part of an external conductor of a coaxial feed line connected to the feed section is covered by a current absorber, so as to forcefully reduce a leakage current. Subsequently, the ground conductor can be reduced and the antenna characteristic can be maintained.
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Ho Tan
Sony Corporation
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