| 摘要 |
An antenna structure (10) that includes a plurality of transmit linear elements (22a-22d) arranged parallel to one another and a plurality of receive linear elements (24a-24d) also arranged parallel to one another. Individual ones of the plurality of transmit linear elements are spaced apart from one another and have one of the plurality of receive linear elements disposed therebetween. A width of each of the plurality of transmit linear elements and the plurality of receive linear elements varies periodically along a length of the linear element, thereby also periodically impedance modulating each element. Furthermore, a narrowest width portion of a transmit linear element is disposed adjacent to a widest width portion of an adjacently disposed receive linear element, and vice versa, thereby minimizing coupling between the elements. The transmit amplifiers (16a, 16b) and the receive amplifiers (30a, 30b) are located at opposite ends of an antenna stalk body (36) such that the transmit amplifiers and receive amplifiers are intimately associated with their respective antenna elements, thereby further minimizing losses. Also, because the transmit amplifiers may generate considerable heat, the construction technique thermally isolates the lower power receive amplifiers from the higher power transmit amplifiers. Also, the transmit amplifiers are preferably located at the end of the antenna stalk that is nearest to the user transceiver, thereby providing improved heat sinking. |
