Low profile antenna—conformal

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, wherein each radiating surface comprises a quadrilateral surface having four sides, with a group of four quadrilateral surfaces comprising an orientation-independent radiator, and wherein a plurality of orientation-independent radiators are disposed in further groups of four, thereby providing at least four groups of four quadrilateral surfaces for a total of at least sixteen quadrilateral surfaces, with the radiating surfaces further disposed in a defined pattern wherein 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, the frequency dependent couplings configured to decouple the four radiating surfaces in each group at a first operating frequency band, and configure to also couple together the four radiating surfaces in each group at a second operating frequency band;
• and
• with a surface area of each quadrilateral surface comprising an orientation-independent radiator responsive within the first operating frequency band, and with a collective surface area of the four quadrilateral surfaces within each group of four quadrilateral surfaces together comprising another orientation-independent radiator responsive at the second operating frequency band, wherein the second operating frequency band is lower in frequency than the first operating frequency band.