UNBALANCED ANTENNA
First Claim
1. An unbalanced antenna comprising:
- a radiation conductor; and
a ground conductor disposed with a predetermined gap relative to the radiation conductor, wherein the ground conductor further includes a first predetermined part configured to function as a pole for forming a near electromagnetic-field distribution together with the radiation conductor opposed to the ground conductor, and a second predetermined part for contributing to impedance matching.
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Accused Products
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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Citations
25 Claims
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1. An unbalanced antenna comprising:
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a radiation conductor; and
a ground conductor disposed with a predetermined gap relative to the radiation conductor, wherein the ground conductor further includes a first predetermined part configured to function as a pole for forming a near electromagnetic-field distribution together with the radiation conductor opposed to the ground conductor, and a second predetermined part for contributing to impedance matching. - View Dependent Claims (2, 3, 4, 5, 10)
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6. An unbalanced antenna comprising:
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a radiation conductor; and
a ground conductor disposed with a predetermined gap relative to the radiation conductor, wherein the ground conductor is reduced in size except at least a predetermined part substantially opposed to the radiation conductor and divided into a plurality of parts according to a distance from a feed section, and wherein electric resistors are connected between the divided ground conductors. - View Dependent Claims (7, 8, 9, 11)
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12. An unbalanced antenna comprising:
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a dielectric substrate having an upper-layer electrode surface and a lower-layer electrode surface;
a substantially planar radiation electrode;
a transmission-line electrode connected to the radiation electrode, said radiation electrode and said transmission-line electrode being formed on the upper-layer surface or the lower-layer surface of the dielectric substrate;
a ground electrode formed near a predetermined part of a surface of the dielectric substrate that does not have the radiation electrode disposed thereon, and being opposed to the transmission-line electrode;
at least one sub-ground electrode disposed adjacent to the ground electrode;
an electric resistor connected between the ground electrode and the at least one sub-ground electrode; and
an electric-signal feed path provided between the transmission-line electrode and the ground electrode. - View Dependent Claims (17, 20, 23)
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13. An unbalanced antenna comprising:
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a dielectric substrate having an upper-layer electrode surface and a lower-layer electrode surface;
a substantially planar radiation electrode;
a transmission-line electrode connected to the radiation electrode, said radiation electrode and said transmission-line electrode being formed on the upper-layer surface or the lower-layer surface of the dielectric substrate;
a ground electrode that is flush with the radiation electrode and the transmission-line electrode and is divided so as to sandwich the transmission-line electrode;
at least one sub-ground electrode disposed adjacent to the ground electrode;
an electric resistor connected between the ground electrode and the at least one sub-ground electrode; and
an electric-signal feed path provided between the transmission-line electrode and the ground electrode. - View Dependent Claims (18, 21, 24)
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14. An unbalanced antenna comprising:
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a multi-layered dielectric substrate having three electrode surfaces, including an upper-layer, an intermediate-layer, and a lower-layer electrode surface;
a substantially planar radiation electrode and a transmission-line electrode connected to the radiation electrode that is formed on the intermediate-layer surface of the multi-layered dielectric substrate;
a ground electrode formed near a predetermined part of the lower-layer surface of the multi-layered dielectric substrate, the predetermined part being opposed to the transmission-line electrode;
at least one sub-ground electrode provided, so as to be adjacent to the ground electrode;
an electric resistor connected between the ground electrode and the at least one sub-ground electrode;
an opposed ground electrode formed near a predetermined part of the upper-layer surface of the multi-layered dielectric substrate, the predetermined part being opposed to the transmission-line electrode;
two or more inter-ground-electrode connection sections configured to electrically connect the ground electrode to the opposed ground electrode; and
an electric-signal feed path formed between the transmission-line electrode and the ground electrode, and/or the transmission-line electrode and the opposed ground electrode. - View Dependent Claims (15, 16, 19, 22, 25)
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Specification