| 摘要 |
<p>An antena (10A, 20, 30) which exhibits a low profile. The antenna includes a counterpoise (10A) of electrically conductive material and a passive element (20) oriented substantially parallel thereto. The ends (22, 24) of the passive element (20) are electrically coupled to the counterpoise surface. An active element (30) of electrically conductive material includes a middle portion and first and second outer end portions (48, 50). The middle portion is situated adjacent and spaced apart from the passive element (20) by a predetermined distance and a parallel relationship therewith. The first outer end portion (48) of the active element (30) is bent toward the grounded end (22) of the passive element (20) nearest thereto. The first outer end portion represents a feedpoint of the antenna with respect to the counterpoise (10A). The remaining second outer end portion (50) of the active element (30) is bent towards the remaining end (24) of the passive element (20) nearest thereto. The first and second outer portions (48, 50) by virtue of the bends which orient them close to the ends of the passive element (20) result in coupling of substantial electromagnetic energy between the active element and a passive element. Substantial electromagnetic energy is radiated with both horizontal polarization and vertical polarization when the antenna is excited. </p> |
