Patent ID: 6906678

Claim:
A multi-frequency printed antenna, comprising: a substrate with an insulating plate structure and having a first surface and a second surface opposite to the first surface; a feed strip formed on the first surface and extending in a first direction, in which one end of the feed strip is connected to a signal terminal of a RF signal source; a first radiating conductive strip formed on the first surface and extending in the first direction, in which the first radiating conductive strip has a first connecting portion for connecting to another end of the feed strip; a second radiating conductive strip formed on the first surface and extending in the first direction, in which the second radiating conductive strip has a second connecting portion for connecting to the another end of the feed strip; a ground strip formed on the second surface and extending in the first direction, in which one end of the ground strip is connected to a ground terminal of the RF signal source; a first grounded conductive strip formed on the second surface and extending in the first direction, in which the first grounded conductive strip has a third connecting portion for connecting to another end of the ground strip; and a second grounded conductive strip formed on the second surface and extending in the first direction, in which the second grounded conductive strip has a fourth connecting portion for connecting to the another end of the ground strip, wherein the first radiating conductive strip and the first ground conductive strip form a first half wavelength dipole antenna for a first frequency transmission while the second radiating conductive strip and the second ground conductive strip form a second half wavelength dipole antenna for a second frequency transmission, wherein the first radiating conductive strip and the second ground conductive strip form a third half wavelength dipole antenna for a third frequency transmission.