US4757322A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mobile antenna unit
Assignee: Pioneer Corp
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Filing: 1985-09-25
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Granted: 1988-07-12
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Expires: 2005-09-25
Abstract
Abstract A mobile antenna unit for use in the FM broadcast band which is adapted to be mounted on the windshield of the vehicle and which provides a gain and directivity pattern similar to those of an external whip antenna. The antenna element takes the form of a conductor mounted near one of the pillars supporting the windshield. The pillar appears electrically as an inductor and the conductor as a capacitor. By properly dimensioning and spacing the conductor with respect to the pillar, resonance is achieved in the FM broadcast band.
Inventors
- 👤 Tomohisa Yokogawa
- 👤 Shintaro Gomi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:36
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/40; H01Q1/12; H01Q1/1271; H01Q1/27; H01Q1/32; H01Q1/325; H01Q1/3283; H01Q1/44
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
161 words
In a mobile antenna unit installed on a vehicle which has a pillar with a conductive part of metal on the side of a window glass plate, wherein the improvement comprises: an antenna whose effective electrical length is less than a fourth of the wavelength of a receiving radio wave and which is mounted on a surface of said glass plate a predetermined distance from said pillar, said antenna having first and second end points defining said electrical length with one of said first and second end points being an output terminal, and a line connecting said first and second end points being substantially parallel to said pillar, so that said pillar acts as an inductance and said antenna acts as a capacitance to achieve resonance in a predetermined receiving band, and a ground terminal of a means connected to receive a signal from said antenna being connected to a body of said vehicle near said output terminal of said antenna.
Claim 2
Dependent Claim
161 words
In a mobile antenna unit installed on a vehicle which has a pillar with a conductive part of metal on the side of a window glass plate, wherein the improvement comprises: an antenna whose effective electrical length is less than a fourth of the wavelength of a receiving radio wave and which is mounted on a surface of said glass plate a predetermined distance from said pillar, said antenna having first and second end points defining said electrical length with one of said first and second end points being an output terminal, and a line connecting said first and second end points being substantially parallel to said pillar, so that said pillar acts as an inductance and said antenna acts as a capacitance to achieve resonance in a predetermined receiving band, and a ground terminal of a means connected to receive a signal from said antenna being connected to a body of said vehicle near said output terminal of said antenna.
Claim 3
Dependent Claim
31 words
The mobile antenna unit of claim 1, wherein said antenna is mounted a distance from said pillar such that said antenna resonates at a frequency within a standard FM broadcast band.
Claim 4
Dependent Claim
17 words
The mobile antenna of claim 2, wherein said antenna comprises a transparent sticker incorporating a conductive foil.
Claim 5
Dependent Claim
28 words
The mobile antenna unit of claim 3, wherein said antenna comprises two transparent plastic films joined together by thermocompression with said conductive foil held between said plastic films.
Claim 6
Dependent Claim
23 words
The mobile antenna unit of claim 4, further comprising an adhesive coated on an outer surface of one of said transparent plastic films.
Claim 7
Dependent Claim
17 words
The mobile antenna unit of claim 3, wherein at least one of said plastic films is colored.
Claim 8
Dependent Claim
16 words
The mobile antenna unit of claim 3, wherein said foil is cut in a J shape.
Claim 9
Dependent Claim
20 words
The mobile antenna unit of claim 2, further comprising a buffer amplifier for amplifying an output signal from said antenna.
Claim 10
Dependent Claim
23 words
The mobile antenna unit of claim 8, further comprising a box for mounting said buffer amplifier near an output terminal of said antenna.
Claim 11
Dependent Claim
16 words
The mobile antenna unit of claim 1, wherein said window glass plate is a front window.
Claim 12
Dependent Claim
16 words
The mobile antenna unit of claim 1, wherein said window glass plate is a side window.
Claim 13
Dependent Claim
16 words
The mobile antenna unit of claim 1, wherein said window glass plate is a rear window.
Claim 14
Dependent Claim
22 words
The mobile antenna unit of claim 1, wherein said means connected to receive a signal from said antenna is a coaxial cable.
Claim 15
Dependent Claim
23 words
The mobile antenna unit of claim 1, wherein said means connected to receive a signal from said antenna is an impedance changing means.
Claim 16
Dependent Claim
19 words
The mobile antenna unit of claim 1, wherein the entire length of said antenna is parallel to said pillar.
Claim 17
Dependent Claim
148 words
A mobile antenna unit, for installation on a vehicle having a pillar with a conductive part of metal on the side of a glass window, comprising: an antenna comprising a transparent sticker, said sticker incorporating a conductive foil cut in the shape of a predetermined pattern, said pattern extending along an axis substantially parallel to said pillar, the effective electrical length of said pattern being less than one fourth of the wavelength of a receiving radio wave. and said antenna being mounted on a surface of said glass plate a predetermined distance from said pillar so that said pillar acts as an inductance and said antenna acts as a capacitance to achieve resonance in a predetermined receiving band, and a ground terminal of a means connected to receive a signal from said antenna being connected to a body of said vehicle near an output terminal of said antenna.
Claim 18
Dependent Claim
148 words
A mobile antenna unit, for installation on a vehicle having a pillar with a conductive part of metal on the side of a glass window, comprising: an antenna comprising a transparent sticker, said sticker incorporating a conductive foil cut in the shape of a predetermined pattern, said pattern extending along an axis substantially parallel to said pillar, the effective electrical length of said pattern being less than one fourth of the wavelength of a receiving radio wave. and said antenna being mounted on a surface of said glass plate a predetermined distance from said pillar so that said pillar acts as an inductance and said antenna acts as a capacitance to achieve resonance in a predetermined receiving band, and a ground terminal of a means connected to receive a signal from said antenna being connected to a body of said vehicle near an output terminal of said antenna.
Claim 19
Dependent Claim
15 words
The mobile antenna unit of claim 16, wherein said predetermined pattern is an alphanumeric character.
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) | 1991-07-12 | 1992-01-11 | 1992-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-12 | 1996-01-11 | 1996-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-12 | 2000-01-11 | 2000-07-12 | $7700.00 | Window Closed / Lapsed |