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引言谐波抑制滤波器在现代微波、毫米波接收机和测量系统中有着广泛的应用。例如,在接收机前端系统中,它们可用作为镜像抑制和通路的预选滤波器。此外,把它们和“倍频”式毫米波源结合起来,可以使其谐波成分大为降低,这无疑将会改善测量结果。这类滤波器的关键指标是要求低的通带插入损耗,高的选择性和宽的阻带。为满足这些要求,我们已经设计并试验了多种悬置基片上的平行耦合线滤波器。滤波器由在一块单片的屏蔽盒里集成的印
Introduction Harmonic suppression filter in the modern microwave, millimeter wave receiver and measurement system has a wide range of applications. For example, in receiver front-end systems, they can be used as pre-selected filters for image rejection and routing. In addition, combining them with a “double-frequency” millimeter-wave source greatly reduces the harmonic content, which undoubtedly improves the measurement. The key indicators of this type of filter are low passband insertion loss, high selectivity, and wide stopband. To meet these requirements, we have designed and tested parallel coupled line filters on a variety of suspended substrates. The filter consists of a single integrated shield in the box printed