功率分配器6大技术指标分享

时间： 2023-11-07 来源：优译官网

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本文中优译将与大家分享功率分配器6大技术指标。

功率分配器（power divider）是一种将一路输入信号能量分成两路或多路输出相等或不相等能量的器件，也可反过来将多路信号能量合成一路输出，此时可也称为合路器。

图 1

一个功分器的输出端口之间应保证一定的隔离度。功率分配器也叫过流分配器，分有源，无源两种，可平均分配一路信号变为几路输出，一般每分一路都有几dB的衰减，信号频率不同，分配器不同衰减也不同，为了补偿衰减，在其中加了放大器后做出了无源功分器。

功率分配器的技术指标包括频率范围、承受功率、主路到支路的分配损耗、输入输出间的插入损耗、支路端口间的隔离度、每个端口的电压驻波比等。

1.频率范围：

这是各种射频/微波电路的工作前提，功率分配器的设计结构与工作频率密切相关。必须首先明确分配器的工作频率，才能进行下面的设计。

2.承受功率：

在大功率分配器/合成器中，电路元件所能承受的最大功率是核心指标，它决定了采用什么形式的传输线才能实现设计任务。一般地，传输线承受功率由小到大的次序是微带线、带状线、同轴线、空气带状线、空气同轴线，要根据设计任务来选择用何种形式传输。

3.分配损耗：

主路到支路的分配损耗实质上与功率分配器的功率分配比有关。如两等分功率分配器的分配损耗是3dB，四等分功率分配器的分配损耗是6dB。

图 2

4.插入损耗：

输入输出间的插入损耗是由于传输线（如微带线）的介质或导体不理想等因素引起的。输入端的驻波比所带来的损耗在设计时也需要被考虑到。

5.隔离度：

支路端口间的隔离度是功率分配器的另一个重要指标。如果从每个支路端口输入功率只能从主路端口输出，而不应该从其他支路输出，这就要求支路之间有足够的隔离度。

6.驻波比：

每个端口的电压驻波比越小越好。

功率分配器的常见用途是接多个卫星接收机用的，将一路输入的卫星中频信号均等的分成几路输出，通常有二功分、四功分、六功分等等。根据所接接收机的多少选用功率分配器。如果接两接收机就用二功率分配器，接四接收机就用四功率分配器。

图 3

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本文由三年不鸣转载自优译官网，原文标题为:功率分配器介绍，本站所有转载文章系出于传递更多信息之目的，且明确注明来源，不希望被转载的媒体或个人可与我们联系，我们将立即进行删除处理。

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