Antenna for motor vehicles, and motor vehicle comprising such an antenna

An antenna for a motor vehicle, comprising:

• a mounting plate suitable to be connected to a mounting surface of said motor vehicle;
• at least a first printed circuit board adapted to be connected, in a substantially horizontal position, to said mounting plate;
• at least one first radiating element for transceiving first signals with the environment outside said antenna, said first radiating element comprising a second printed circuit board which is connected at a first end portion thereof to said first printed circuit board and rises therefrom along a substantially vertical direction, along said second printed circuit board being arranged a first electrically conducting track which has an end portion connected to said first printed circuit board and extends on said second printed circuit board along a substantially helical or serpentine path, up to a first height measured from the top surface of said first printed circuit board along said substantially vertical direction;
• and
• at least a second radiating element for transceiving second signals with the environment outside the antenna, said second radiating element comprising a third printed circuit board which is connected at a first end portion thereof to said first printed circuit board and rises therefrom along said substantially vertical direction, along said third printed circuit board being arranged a second electrically conductive track which has an end portion connected to said first printed circuit board and extends on said third printed circuit board along a substantially helical or serpentine path, up to a second height measured from the top surface of said first printed circuit board along said substantially vertical direction;
• wherein said first radiating element has a maximum height measured from the top surface of said first printed circuit board along said substantially vertical direction, and said first height of said first electrically conducting track is less than or equal to one-half of said maximum height of said first radiating element;
• wherein said first radiating element further comprises a capacitive cap which is connected to said second printed circuit board at a second end portion of said second printed circuit board opposite said first end portion;
• wherein said capacitive cap comprises at least a center section, a first arm and a second arm which extend from opposite parts of the center section diverging from each other, and one or more coupling portions which extend from at least one of said center section and first and second arms and are configured to allow mechanical connection of the capacitive cap to the second printed circuit board;
• and
• wherein said one or more coupling portions comprise a first section protruding transversely from one end of said first arm toward said second printed circuit board, a second section that protrudes transversely from one end of the first section toward the center section, and one or more teeth that protrude transversely from one end of the second section and are each suitable for insertion into a corresponding slot defined on the second printed circuit board.