公开(公告)号：WO1994021001A1

公开(公告)日：1994-09-15

申请号：PCT/US1994001691

申请日：1994-02-14

Applicant: MOTOROLA INC.

Inventor： MOTOROLA INC. ,  MOLLER, Paul, J. ,  SWINGHAMMER, Patrick, A. ,  SCHWARTZ, Mark, W.

IPC: H01Q01/24

CPC classification number: H01Q1/362 ,  H01Q1/244 ,  H01Q9/36 ,  H01Q9/40

Abstract: An antenna assembly (100), and associated method, for a radio, such as a portable radiotelephone, which is of minimal physical dimensions and which is operable over a wide range of frequencies. A length of wire (106) is helically-shaped and includes at least a portion of winding. A capacitive top-hat (136) is positioned at an end portion of the wire. By increasing the number of windings of the wire (106), the height of the antenna assembly is reduced, but such reduction also reduces the size of the bandwidth of frequencies over which the antenna assembly is operable. Increase in the size of the surface area of the capacitive top-hat (136) increases the size of the bandwidth over which the antenna assembly is operable. Selection of the top-hat size and the number of windings permits both physical dimensions of the antenna assembly and the size of the bandwidth to be selected.

Abstract translation: 一种用于诸如便携式无线电话机的无线电装置的天线组件（100）及其相关联的方法，其具有最小的物理尺寸并且可在宽范围的频率上操作。 一段电线（106）是螺旋形的并且包括至少一部分绕组。 电容顶帽（136）位于线的端部。 通过增加线（106）的绕组数目，天线组件的高度减小，但是这种减小也减小了天线组件可操作的频率带宽的大小。 电容式顶帽（136）的表面积的大小的增加增加了天线组件可操作的带宽的大小。 顶帽大小和绕组数的选择允许天线组件的物理尺寸和带宽的大小被选择。