US5532709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Directional antenna for vehicle entry system
Assignee: Visteon Global Technologies Inc
•
Filing: 1994-11-02
•
Granted: 1996-07-02
•
Expires: 2014-11-02
Abstract
Abstract The invention uses a modified Yagi-Uda antenna as a directional antenna for remote entry applications for transportation vehicles. To reduce the area that the antenna requires for packaging in a vehicle headliner, the antenna employs a shared reflector for plural reception zones on opposite sides of the vehicle. Since the antenna is packaged close to body sheet metal, a folded dipole is used as the antenna feed element to increase input impedance and simplify impedance matching with the receiver.
Inventors
- 👤 Timothy J. Talty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:31
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/27; H01Q1/32; H01Q1/3208; H01Q1/3233; H01Q19/00; H01Q19/28; H01Q19/30
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
148 words
A pair of directional antennas for concealed mounting on a transportation vehicle to receive radio-frequency (RF) signals from first and second predetermined zones on opposite sides of said transportation vehicle, comprising: a shared reflector element substantially bisecting said first and second predetermined zones; a first elongated active antenna element positioned between said shared reflector and said first predetermined zone; a first elongated director element disposed between said first elongated active antenna element and said first predetermined zone and resonantly directing said RF signals from said first predetermined zone to said first elongated active antenna element; a second elongated active antenna element positioned between said shared reflector and said second predetermined zone; and a second elongated director element disposed between said second elongated active antenna element and said second predetermined zone and resonantly directing said RF signals from said second predetermined zone to said second elongated active antenna element.
Claim 2
Dependent Claim
148 words
A pair of directional antennas for concealed mounting on a transportation vehicle to receive radio-frequency (RF) signals from first and second predetermined zones on opposite sides of said transportation vehicle, comprising: a shared reflector element substantially bisecting said first and second predetermined zones; a first elongated active antenna element positioned between said shared reflector and said first predetermined zone; a first elongated director element disposed between said first elongated active antenna element and said first predetermined zone and resonantly directing said RF signals from said first predetermined zone to said first elongated active antenna element; a second elongated active antenna element positioned between said shared reflector and said second predetermined zone; and a second elongated director element disposed between said second elongated active antenna element and said second predetermined zone and resonantly directing said RF signals from said second predetermined zone to said second elongated active antenna element.
Claim 3
Dependent Claim
21 words
The antennas of claim 1 wherein said first and second elongated active antenna elements are each comprised of a folded dipole.
Claim 4
Dependent Claim
31 words
The antennas of claim 1 wherein both antennas are packaged beneath a sheet metal panel of said transportation vehicle. a directional antenna mounted on said transportation vehicle including an elongated active.
References Cited (Backward Citations)
US2490777A
Cited
US2841787A
Cited
US4097868A
Cited
US4184400A
Cited
US4514734A
Cited
US4536752A
Cited
US4719460A
Cited
US4727377A
Cited
US4763121A
Cited
US4812855A
Cited
US4978963A
Cited
US5008681A
Cited
US5061944A
Cited
US5337066A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-07-02 | 2000-01-01 | 2000-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-07-02 | 2004-01-01 | 2004-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-07-02 | 2008-01-01 | 2008-07-02 | $7700.00 | Window Closed / Lapsed |