用于便携式数据终端的天线

O. Garay, Q. Balzano
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引用次数: 4

摘要

便携式数据终端对辐射的要求与传统的便携式无线电略有不同。当操作员按下PTT开关时,通常需要一个便携式发射机辐射到用户的手上或腰带上。辐射环境,辐射器附近的物体(比如距离小于6英寸)和无线电相对于这些物体的位置是可以预测的。例如,设计师可以期望无线电盒将在用户的手中,天线将在这样的人的脸前面,并且在用户的头部周围有几英尺的自由空间。可以预期无线电用户在这种条件下操作发射机。但便携式数据终端的情况并非如此,它的射频传输不是由操作员控制,而是由基站的询问控制。在这种情况下,终端需要从公文包内部、桌子上、金属板上等处辐射。一般来说,人们可以看到,终端预计将从导体或非导体表面附近的任何位置辐射。传统的便携式天线,如鞭子状天线和螺旋形天线,当靠近导体表面并与导体表面平行放置时,不能满足有效辐射的条件。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
An antenna for a portable data terminal
A Portable Data Terminal has radiation requirements somewhat different from those of a traditional portable radio. A portable transmitter is normally required to radiate in the hands or on the belt of the user when the operator depresses the Push-To-Talk (PTT) switch. The radiation environment, the objects in the immediate vicinity of the radiator (say less than six inches distant) and the position of the radio with respect to such objects, is predictable. For example, the designer can expect that the radio case will be in the hand of the user, the antenna in front of the face of such person, and that there are a few feet of free space around the head of the user. The user of the radio can be expected to operate the transmitter in such conditions. This is not the case for a portable data terminal whose RF transmissions are controlled not by an operator but by interrogation by a base station. In these conditions, the terminal is required to radiate from inside a briefcase, on a table, on a metal slab, etc. In general, one can see that the terminal is expected to radiate from any position in the close vicinity of conducting or non-conducting surfaces. Traditional portable antennas, e.g., whips and helices, cannot satisfy the condition of radiating efficiently when placed close to and parallel to conducting surfaces.
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