On-vehicle windowpane antenna apparatus
First Claim
Patent Images
1. A windowpane antenna apparatus for use in vehicles, comprising:
- a rectangular loop formed of a first long and narrow conductor and mounted on a windowpane of a vehicle such that a longer axis extends in a horizontal direction, the rectangular loop having a pair of long sides opposite to each other and a pair of short sides opposite to each other so as to form a single rectangular closed loop having four corner sections;
a power supply section provided at one of lower corner sections of the four corner sections;
a composite line formed of a second long and narrow conductor arranged close and parallel to one of the short sides of the rectangular loop, which is located farther away from the power supply section; and
means for operating the rectangular loop including the composite line as a circularly polarized antenna which emits a circularly polarized wave in a direction perpendicular to a plane where the rectangular loop is formed and which receives a GPS wave,wherein each of the short sides of the rectangular loop has a length Ly ranging from 0.14λ
to 0.22 λ and
the rectangular loop is arranged and located at a height h of λ
/4 above a lower side of a window frame when λ
represents a wavelength of a center frequency of the GPS wave.
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Abstract
A on-vehicle windowpane antenna apparatus according to the present invention is mounted on a windowpane of a vehicle. The apparatus includes a rectangular loop formed of a first long and narrow conductor, and a composite line formed of a second long and narrow conductor arranged in parallel with one of short sides of the rectangular loop. The apparatus also includes means for causing the apparatus to serve as a circularly polarized antenna which emits a circularly polarized wave in a direction perpendicular to a plane where the rectangular loop including the composite line is formed, and which is capable or receiving a GPS wave.
13 Citations
2 Claims
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1. A windowpane antenna apparatus for use in vehicles, comprising:
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a rectangular loop formed of a first long and narrow conductor and mounted on a windowpane of a vehicle such that a longer axis extends in a horizontal direction, the rectangular loop having a pair of long sides opposite to each other and a pair of short sides opposite to each other so as to form a single rectangular closed loop having four corner sections; a power supply section provided at one of lower corner sections of the four corner sections; a composite line formed of a second long and narrow conductor arranged close and parallel to one of the short sides of the rectangular loop, which is located farther away from the power supply section; and means for operating the rectangular loop including the composite line as a circularly polarized antenna which emits a circularly polarized wave in a direction perpendicular to a plane where the rectangular loop is formed and which receives a GPS wave, wherein each of the short sides of the rectangular loop has a length Ly ranging from 0.14λ
to 0.22 λ and
the rectangular loop is arranged and located at a height h of λ
/4 above a lower side of a window frame when λ
represents a wavelength of a center frequency of the GPS wave. - View Dependent Claims (2)
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Specification
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Current AssigneeHarada Industry Company Limited
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Original AssigneeHarada Industry Company Limited
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InventorsTachihara, Hiroyuki, Saitoh, Masatoshi
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Primary Examiner(s)Wong, Don
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Assistant Examiner(s)NGUYEN, HOANG V
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Application NumberUS08/851,887Time in Patent Office854 DaysField of Search343/713, 343/741, 343/895, 343/754, 343/700 MSUS Class Current343/713CPC Class CodesG01S 19/36 relating to the receiver fr...H01Q 1/1271 for mounting on windscreensH01Q 1/3283 side-mounted antennas, e.g....H01Q 7/00 Loop antennas with a substa...
