Antenna device capable of adjusting frequency
First Claim
1. An antenna device comprising:
- a ground conductor plate, anda radiating conductor plate made of a metal plate and spaced from the ground conductor plate,wherein the radiating conductor plate is provided with an adjustment element that adjusts an electrical length, the adjustment element formed in a shape of a ladder obtained by a combination of holes and crosspieces which are provided between a central portion and an outer circumferential edge of the radiating conductor plate, the crosspieces are cut to adjust the electrical length, the radiating conductor plate has at least one feeding portion, and the ladder-shaped portion is formed in a direction of an electric field generated on the radiating conductor plate.
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Accused Products
Abstract
An antenna device includes a ground conductor plate, and a radiating conductor plate made of a metal plate, which is spaced from the ground conductor plate. The radiating conductor plate is provided with adjusting means for adjusting the electrical length. Thus, the correction of the electrical lengths can be made even if there is a difference between the electrical lengths of the radiating conductor plate caused by assembling errors, etc. In addition, when the antenna device is used in a state in which it is connected to external equipment, the adjusting means allows the adjustment of the electrical lengths of the radiating conductor plate even if the electrical lengths of the radiating conductor plate are subjected to the electrical influence from the electrical equipment and its surrounding environment.
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Citations
5 Claims
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1. An antenna device comprising:
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a ground conductor plate, and a radiating conductor plate made of a metal plate and spaced from the ground conductor plate, wherein the radiating conductor plate is provided with an adjustment element that adjusts an electrical length, the adjustment element formed in a shape of a ladder obtained by a combination of holes and crosspieces which are provided between a central portion and an outer circumferential edge of the radiating conductor plate, the crosspieces are cut to adjust the electrical length, the radiating conductor plate has at least one feeding portion, and the ladder-shaped portion is formed in a direction of an electric field generated on the radiating conductor plate. - View Dependent Claims (2, 3, 4, 5)
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Specification