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1. (WO2018129112) LOW PROFILE ANTENNA - CONFORMAL
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CLAIMS

1. An antenna for use in a vehicle comprising:

a cavity having conductive walls;

a plurality of radiating surfaces disposed in a reference plane located above the cavity, such that each radiating surface comprises a quadrilateral surface having four sides, with a group of four quadrilateral surfaces comprising an orientation independent radiator, and such that a plurality of orientation-independent radiators are disposed in further groups of four, thereby providing at least sixteen quadrilateral surfaces, with the radiating surfaces further disposed in a defined pattern such that at least one side of a selected quadrilateral surface of a selected orientation-independent radiator is aligned in parallel with a least one side of another quadrilateral surface of another orientation-independent radiator within the reference plane,

a plurality of frequency dependent couplings, each frequency dependent coupling disposed between a respective one of the radiating surfaces of the selected orientation-independent radiator and the other orientation-independent radiator and/or a ground plane element, and

with a surface area of each quadrilateral surface depending upon a first operating frequency, and with a collective surface area of the four quadrilateral surfaces comprising each orientation-independent radiator depending upon a second operating frequency, wherein the second operating frequency is less than the first operating frequency.

2. The antenna of claim 1 additionally wherein:

the cavity is disposed below a body panel of the vehicle.

3. The antenna of claim 1 additionally wherein

the ground plane element comprises one or more surrounding ground plane surfaces, disposed adjacent to the radiators and in line with or below the reference plane, the ground plane surfaces electrically surrounding all of the quadrilateral surfaces.

4. An antenna for use in a vehicle comprising:

a cavity disposed below a body panel defining a reference plane;

an orientation-independent antenna array comprising one or more directional subarrays, disposed within the cavity and within or beneath the reference plane;

one or more surrounding ground plane surfaces, disposed adjacen to the subarrays and in line with or below the reference plane, the ground plane surfaces electrically surrounding the orientation-independent array;

frequency dependent couplings, disposed between the array and at least one of the surrounding ground plane surfaces; and

beamforming circuits, for controlling a radiating direction of the array.

5. A method for controlling access to a vehicle, comprising:

detecting, with a directional antenna, a relative position of a remote device, when the remote device moves closer than a defined distance to the vehicle operating a selected vehicle door, the selected vehicle door depending on the relative position of the remote device with respect to the vehicle.