| 摘要 |
An antenna device (111) for surface mounting has a dielectric base plate (112), a chassis (113) made of an electrically conductive material and attached to the dielectric base plate, a feed electrode (119) and grounding electrodes. The chassis (113) has a planar radiative part (116) facing the upper surface of the dielectric base plate and side walls (135) at its edges. The side walls are provided with slits (135c, 135d) which separate portions of the side wall into removable parts (135e, 135f). The resonance frequency of the antenna device (111) can be adjusted by cutting off and removing one or more of these removable parts (135e, 135f) of the side walls. These removable parts (135e, 135f) can be cut off and removed even after the chassis (113) has been attached to the base plate (112) or the antenna device (111) has been mounted to a circuit board. <IMAGE> |
