In wireless communication, there is a strong demand for tunable filters in scenarios that require adaptively coping with multiband interference in RF front ends. Tuning devices, ferroelectric capacitors, ferromagnetic-material-based devices, microelectromechanical systems capacitors, and piezoelectric-material-based devices are commonly used for center frequency tuning or bandwidth adjustment in tunable filter realizations. Tunable or switchable filters are essential for this desired adaptability. However, each type has thus far demonstrated its particular disadvantages. Typically, continuously tunable filters are difficult to design or require intensive use of resources to control accurately, while switchable filter banks have significant insertion loss from switching networks. Tuning capability in tunable filters often requires human intervention to control tuning frequencies or bandwidths. In this article, we introduce autonomously tunable filters to adaptively protect or mitigate receiver systems from unwanted or unreferenced signals in RF front ends using an RF-power-dependent coupling without extra control signals or closed-loop feedback of digital processing of the spectrum through analog-to-digital and digital-to-analog converters.

中文翻译：

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用于减轻干扰的自主可调滤波器：无需操作员干预即可减轻干扰的自主可切换/可调射频/微波滤波器的进展

在无线通信中，在需要自适应应对射频前端多频段干扰的场景中，对可调滤波器有强烈的需求。调谐设备、铁电电容器、基于铁磁材料的设备、微机电系统电容器和基于压电材料的设备通常用于可调谐滤波器实现中的中心频率调谐或带宽调整。可调谐或可切换滤波器对于这种所需的适应性至关重要。然而，迄今为止，每种类型都显示了其特定的缺点。通常，连续可调滤波器难以设计或需要大量使用资源来精确控制，而可切换滤波器组具有来自开关网络的显着插入损耗。可调谐滤波器的调谐能力通常需要人工干预来控制调谐频率或带宽。在本文中，我们引入了自主可调滤波器，以自适应地保护或减轻接收器系统免受 RF 前端中不需要或未参考的信号的影响，使用 RF 功率相关耦合，无需额外的控制信号或通过模拟对频谱进行数字处理的闭环反馈数字和数模转换器。