US4721964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Window antenna for a vehicle
Assignee: Nippon Sheet Glass Co Ltd
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Filing: 1986-09-15
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Granted: 1988-01-26
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Expires: 2006-09-15
Abstract
Abstract Disclosed is a window antenna for a vehicle wherein a pair of semiloop antenna elements having a length of λ/2 are branched from a power feed point along a grounded conductor portion in the vertical direction, their terminals are grounded, and the feed point is unbalanced power fed. The antenna has good transmission/reception characteristics in UHF band.
Inventors
- 👤 Gentei Sato
- 👤 Haruo Kawakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:52
CPC Classifications
B; B60; B60R; B60R11/00; B60R11/02; H; H01; H01Q; H01Q1/00; H01Q1/12; H01Q1/1271
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
72 words
A window antenna arranged on a window glass of a vehicle, comprising: a pair of antenna elements branching from a feed point adjacent to a grounded conductor portion laterally therealong in both directions, each antenna element comprising at least one semiloop element of a length of λ/2 having an opening facing the grounded conductor portion, and terminals of said antenna elements being grounded and said feed point being provided with unbalance feeding.
Claim 2
Dependent Claim
72 words
A window antenna arranged on a window glass of a vehicle, comprising: a pair of antenna elements branching from a feed point adjacent to a grounded conductor portion laterally therealong in both directions, each antenna element comprising at least one semiloop element of a length of λ/2 having an opening facing the grounded conductor portion, and terminals of said antenna elements being grounded and said feed point being provided with unbalance feeding.
Claim 3
Dependent Claim
28 words
A window antenna according to claim 1, wherein said antenna is a transmission/reception antenna for a vehicle telephone, and has a conductor length tuned in a UHF band.
Claim 4
Dependent Claim
32 words
A window antenna according to claim 1, wherein said antenna is arranged on a rear window glass of a vehicle together with a defogging heater wire and a radio reception antenna wire.
Claim 5
Dependent Claim
34 words
A window antenna according to claim 1, further comprising an unbalanced power-feed coaxial feeder wire, a core conductor of which is connected to said feed point, and an outer conductor of which is grounded.
Claim 6
Dependent Claim
18 words
A window antenna according to claim 1, wherein said semiloop element is a half of a circular loop.
Claim 7
Dependent Claim
18 words
A window antenna according to claim 1, wherein the grounded conductor portion is a body of a vehicle.
Claim 8
Dependent Claim
28 words
A window antenna according to claim 1, wherein said antenna elements comprise a plurality of series-connected semiloop elements, and terminals of the leftmost and rightmost elements are grounded.
Claim 9
Dependent Claim
26 words
A window antenna according to claim 1, wherein said antenna elements comprise a plurality of series-connected semiloop elements, and terminals of the respective elements are grounded.
Claim 10
Dependent Claim
24 words
A window antenna according to claim 1, wherein said antenna elements are arranged along an upper side of a front window of a vehicle.
Claim 11
Dependent Claim
21 words
A window antenna according to claim 1, wherein said antenna elements are arranged on a rear quarter window of a vehicle.
Claim 12
Dependent Claim
18 words
A window antenna according to claim 1, wherein said semiloop element is a half of a rectangular loop.
Claim 13
Dependent Claim
26 words
A window antenna according to claim 1, wherein said grounded conductor portion is a grounded conductive wire arranged on a window glass along said antenna elements.
Claim 14
Dependent Claim
43 words
A window antenna according to claim 1, further comprising a linear conductor wire having a length of about λ/2 for connecting said pair of antenna elements at its ends, said feed point being arranged at an intermediate point of said linear conductive wire.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-01-25 | 1991-07-27 | 1992-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-25 | 1995-07-27 | 1996-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-25 | 1999-07-27 | 2000-01-26 | $7700.00 | Window Closed / Lapsed |