公开(公告)号：WO1998002936A1

公开(公告)日：1998-01-22

申请号：PCT/US1997012399

申请日：1997-07-16

Applicant: QUALCOMM INCORPORATED

Inventor： QUALCOMM INCORPORATED ,  NGHIEM, David ,  STILLINGER, David, C. ,  LE, Joe, Chieu

IPC: H01Q11/08

CPC classification number: H01Q11/08

Abstract: A modified helical antenna having increased gain over that of a conventional axial mode helical antenna (200) without increasing the length of the antenna. The modified helical antenna (700) uses a conducting cylinder (702) placed around approximately the first two turn of the helix (716) of the antenna (700). The height of the conducting cylinder (702) should extend from a ground plane (712) to approximately 1.5 helical turns. Closely coupling the conducting cylinder (702) to the helix (716) increases the gain in the main beam (318) as energy in the side lobes (324, 326) decreases. This is true as the inside diameter of the conducting cylinder (702) approaches that of the helix (716) up to a cut-off point. For a particular application, optimization of the inside diameter (710) of the conducting cylinder (702) can be achieved empirically or through numerical analysis.

Abstract translation: 改进的螺旋天线的增益高于常规轴向模式螺旋天线（200）的增益，而不增加天线的长度。 改进的螺旋天线（700）使用围绕天线（700）的螺旋（716）的前两转的大致放置的导电圆筒（702）。 导电圆筒（702）的高度应该从接地平面（712）延伸到约1.5螺旋匝。 随着旁瓣（324,326）中的能量减小，将导电圆筒（702）紧密耦合到螺旋（716）增加了主波束（318）中的增益。 这是真实的，因为导电圆筒（702）的内径接近螺旋（716）的直径直到截止点。 对于特定应用，导电气缸（702）的内径（710）的优化可以凭经验地或通过数值分析实现。