双工器以满足复杂的多频带无线需求收缩
作为多频段的智能手机,它必须支持不同的频带,变得越来越普遍,双工器是被动的一个日益重要的组成部分。该多频带带通滤波器置于无线单元的天线和电子之间,允许多个发射功率放大器和接收机前端支持不同的频带,但共用一个共用的天线路径。
在接收端,接收需要两信号从天线(通常称为高和低波段信号)和引导他们到相应的接收机前端;在发送端,它结合了不同频段的两输出功率放大器的信号到天线之前(图1)。技术和现代双工器相关的实现密切相关的SAW滤波器和其他单片固态滤波器。
Figure 1: A basic diplexer consists of co-packaged low- and high-band bandpass filters, to split/combine two adjacent bands so they can share a single antenna.
Some diplexer architectures are based on a simple pairing of a low-pass filter and a high-pass filter to separate the two bands of interest. These implementations usually need additional bandpass filtering to further attenuate signals outside the spectrum of the signals of interest (Figure 2)。 While the combined low-pass plus bandpass filter approach has more functional blocks than a bandpass-only topology, this pairing may ease the challenge of designing filters that meet the overall requirements and so can be less costly along with offering better performance, depending on the specifics of the situation.
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