ANTENNA DEVICE AND COMMUNICATION DEVICE
First Claim
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1. An antenna device comprising:
- an antenna that radiates a circularly polarized radio wave in a direction of a predetermined axis, wherein the antenna is formed with linear conducting bodies each helically winding around the predetermined axis, and adjacent linear conducting bodies are spaced a first distance apart; and
a director that is on the axis, along which a radio wave is radiated from the antenna, at a position a second distance away from the antenna, wherein the second distance is substantially equal to the first distance.
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Abstract
An antenna device includes a helical antenna that radiates a circularly polarized radio wave in a direction of an axis S, in which the helical antenna is formed with linear conducting bodies each helically winding around the predetermined axis and adjacent linear conducting bodies are spaced a distance P apart. The antenna device further includes a director that is on the axis S, along which a radio wave is radiated from the helical antenna, at a position a distance X away from the helical antenna, the distance X being substantially equal to the distance P.
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Citations
10 Claims
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1. An antenna device comprising:
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an antenna that radiates a circularly polarized radio wave in a direction of a predetermined axis, wherein the antenna is formed with linear conducting bodies each helically winding around the predetermined axis, and adjacent linear conducting bodies are spaced a first distance apart; and a director that is on the axis, along which a radio wave is radiated from the antenna, at a position a second distance away from the antenna, wherein the second distance is substantially equal to the first distance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A communication device for radiating a radio wave toward a tag to make a communication with the tag, the communication device comprising:
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an antenna that radiates a circularly polarized radio wave in a direction of a predetermined axis, wherein the antenna is formed with linear conducting bodies each helically winding around the predetermined axis, and adjacent linear conducting bodies are spaced a first distance apart; and a director that is on the axis, along which a radio wave is radiated from the antenna, at a position a second distance away from the antenna, wherein the second distance is substantially equal to the first distance.
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Specification