Surface mounted chassis antenna atop dielectric base plate and having removable edge portions for tuning resonance

An antenna device for surface mounting, comprising:

• a dielectric base plate having an upper surface;
• and
• a chassis made of an electrically conductive material and attached to said dielectric base plate, said chassis having a horizontal planar radiative part with a lower surface over and opposite said upper surface of said dielectric base plate and side walls at edges of said radiative part, said side walls including removable pieces and attachment walls which are both perpendicular to and bent downward from said radiative part, said removable pieces being adapted to be removed for adjusting resonance frequency of said antenna device, said attachment walls being perpendicular to said removable pieces, said attachment walls each having a feed electrode and a grounding electrode protruding further downward therefrom and being in contact with said base plate.