| 摘要 |
An antenna having an antenna cup and a helical element mounted in the antenna cup. The antenna cup has a side wall extending from a base thereof towards an open end thereof, the side wall having a plurality of slots formed therein, a first set of the slots being arranged parallel to a longitudinal axis of the helical element and a second set of the slots being arranged perpendicular to the longitudinal axis of the helical element, the first set of slots being arranged to surround an upper portion of the helical element and the second set of slots being arranged to surround a lower portion of the helical element. The slots present a high impedance wall to surface currents and thereby significantly reduce side lobe radiation. Such an antenna is particular useful in antenna co-location applications, such as cellular telephone and Wi-Fi applications. |
