Internal (multi-band) antenna which is resonant and radiant at high frequency and at least one lower frequency band

摘要

A multi-band microwave antenna which is resonant and radiant at a high frequency band and at one or more lower frequency bands includes an electrically-conductive ground plane (103) on one face of a dielectric substrate (101); an electrically conductive strip line on the opposite face of the dielectric substrate; a curved slot (104) formed in the ground plane having a feed side (105) electromagnetically coupled to the feed end of the strip line, and a load side electromagnetically coupled to the load end of the strip line, such that the slot is resonant and radiant at the high frequency band; and a further electrical conductor (110) electrically connected to the ground plane to serve as a continuation thereof at the load side of the slot and electromagnetically coupled to the slot at the lower frequency bands such as to cause the slot to be resonant and radiant also at the lower frequency band or bands.