| 摘要 |
A dielectric dual antenna intended especially for small-sized radio devices, by one partial antenna of which is implemented the lower operating band of the antenna and by the other partial antenna the upper operating band. The partial antennas have a shared substrate (440), which together with the radiators constitutes an integrated antenna component (400). The partial antennas also have a shared feed point (FP), the part of the antenna component to one direction from the plane, which leads through the feed point and is perpendicular to the upper surface of the substrate, belonging to one partial antenna and the part of the antenna component to the opposite direction belonging to the other partial antenna. At least one of the partial antennas comprises two radiators, the first one (411) of which joins the feed point and the second one (412) is connected to the ground (GND) from its outer end as viewed from the first radiator. This first radiator (411) and the radiator (421) of the other partial antenna, which joins the shared feed point, form a unitary common element (430) on the substrate surface. This common element is shortcircuited to the ground from at least one point (SP1, SP2) relatively near to the feed point. The matching of the dual antenna can be improved in either operating band without degrading it in the other operating band at the same time. |
