Directional antenna for vehicle entry system
First Claim
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1. 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.
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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.
93 Citations
3 Claims
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1. 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:
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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. - View Dependent Claims (2, 3)
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Specification
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Current AssigneeVisteon Global Technologies Incorporated (Visteon Corporation)
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Original AssigneeFord Motor Company
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InventorsTalty, Timothy J.
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Primary Examiner(s)Hajec, Donald T.
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Assistant Examiner(s)PHAN, THO GIA
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Application NumberUS08/333,191Time in Patent Office608 DaysField of Search343/713, 343/817, 343/818, 343/819, 343/810, 343/812US Class Current343/819CPC Class CodesH01Q 1/3233 particular used as part of ...H01Q 19/30 the primary active element ...
