Knowles使用稳定的高Q值陶瓷来开发体积小、选择性高的陶瓷腔体低损耗带通滤波器

时间： 2023-02-07 来源：Knowles官网

技术问答

正如之前的博客文章中所讨论的，谐振器是用于创建滤波器的构建单元。最近，Knowles发表了一篇博文，讨论了两种不同类型的谐振器——同轴陶瓷谐振器和电介质谐振器。在本文中，将详细介绍第三种谐振器——腔体谐振器。

在高层次上，腔体谐振器的设计使得空间或腔体被金属导电表面包围，就像金属盒一样。在金属盒内部，电磁波在腔体壁之间反射。驻波在特定频率下形成，并且腔体在由腔体的尺寸和结构确定的频率下共振。如图1 所示，插入腔体中的导体允许将能量耦合到腔内或腔体外。

图 1. 导体如何插入腔体谐振器以及电能 (E) 和磁能 (B) 如何在腔体周围传播的示例。

要将腔体谐振器用作滤波器的构建单元，您可以组合具有不同特性的腔体来创建所需的滤波器性能。今天使用的一种常见腔体滤波器类型是同轴腔体滤波器，它由耦合的TEM模式传输线组成，通常是腔体内的金属柱。传输线通常一端短路，另一端开路，谐振器长度小于λ/4。如果谐振器都沿同一方向排列，则该滤波器称为梳状滤波器。如果谐振器是交替的，则滤波器称为交指滤波器。

当腔体滤波器适合您的应用需求时

通常，腔体滤波器可用于工作频率高达30GHz的设备，同时在高功率下提供高选择性。虽然腔体滤波器的尺寸通常很大，但使用创新的腔体构造方法，我们可以减小腔体滤波器的尺寸，使其在各种频率下与微带线或陶瓷谐振器滤波器的尺寸非常相似，如图所示在图2中。

图2. 不同滤波器类型的滤波器尺寸与频率的关系。

更具体地说，对于在“X”波段及更高频段运行的应用，直到大约30GHz，腔体梳状滤波器可以做得非常小，易于调谐，易于制造，并且在这些频率下优于集总元件选项（集总元件设计仍然是较低频率的绝佳选择）。对于高于30GHz的工作频率，梳状结构所需的尺寸变得太小，因此我们需要使用用于宽带的交指腔滤波器选项（开发成本更高）或使用窄带的波导。

来自Knowles Precision Devices的腔体滤波器选项

在Knowles Precision Devices，其使用稳定的高Q值陶瓷来开发体积小、选择性高的陶瓷腔体低损耗带通滤波器。典型的陶瓷腔体滤波器比使用波导技术设计的滤波器小30倍。通过多端口实现，可以创建一个非常小、稳定的滤波器，具有宽阻带性能，没有杂散模式。其陶瓷滤波器实现的小型屏蔽特性使其成为与天线和前置放大器集成在低噪声接收器前端中的理想选择。现成的陶瓷腔体滤波器的规格包括：

8 x 0.2 x 0.03英寸用于10GHz滤波器

LO/乘法器链/RF 预选/图像滤波

通带低损耗：典型值2-4 dB

可从C波段扩展到Ku波段的设备

带宽1%到5%

占地面积小（窄尺寸）非常适合开关滤波器组

Knowles还在金属外壳中制造更传统的腔体过滤器，具有以下规格：

窄带至中等带宽的腔体带通F0=200至30GHz带通滤波器0.1%至55%宽

窄带宽的腔带抑制F0=1000MHz至30GHz 0.5至15%

设计工程师还可以与客户合作开发满足您特定应用需求的按需制造或定制腔体滤波器选项。

总的来说，Knowles腔体滤波器非常适合表面贴装装配，是高功率和高可靠性应用的理想选择，例如太空设备可能需要的应用。

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Knowles（楼氏电子）射频/微波产品选型指南

目录- Knowles Technology and Custom Design Overview DLI Brand Devices and Available Product Listing Technical Notes and Custom Configurations

型号- FPC06302,H100XHXS,PDW08607,PDW08605,PDW08606,B076MB6S,L288XC3S,PDW07630,PDW08604,B148LA2S,B280LB0S,B280MD1S,FPC07643,L220XH5S,B056MB5S,B099NC4S,B191KA1S,B080MB5S,B061MB6S,PDW07069,B033ND5S,B168MB1S,DEB-B274MB1S,DEB-B385MDOS,B083LB6S,L204XF4S,PDR05848,B119LB1S,B065NC5S,B210LA0S,J30BLBA032LX1,B084MC6S,B20BLSBN01,N016MD9S,B012MD5S,J30BJBA002LX3,B052NC5S,C079KB1S,PDR06120,L157XG3S,B148QF0S,H140XHXS,FPC10207,B350NB2S,B105MB5S,B114MB1S,PDW06984,PDR06390,B056RC4S,C142KB0S,PDW09692,B047MC5S,B094LA2S,FPC06630,FPC06078,B032ND5S,B102MC1S,B285LB2S,FPC06077,FPC06076,PDW07948,B119MB1S,B115NB4S,B111NC4S,B230LA0S,L254XF3S,PDR06380,FPC06075,FPC06074,FPC06073,B042OD4S,B142LA2S,B060NC5S,B145LB1S,B380KA1S,B274MB1S,FPC06882,B032OD5S,FPC06881,J30BJBA032LX1,B180MA1S,PDW06407,PDW06089,PDW06400,PDW06401,B192NB2S,J30XXBA002LX3,H120XHXS,B100RH2W,B220LA0S,B280LA0S,B280MC1S,N012ME9S,B118LB4S,B291MB0S,B070MB6S,B121MB4S,B040RG9S,B070NC5S,B393KD0S,J30BLBA002LX3,B095MB1S,AFL09387,B057MC5S,B20BHSBN01,FPC07183,FPC07182,FPC07181,B120MB1S,FPC07180,B021MC8S,FPC06149,L128XH4S,FPC07234,B024RF2S,B100MC5S,FPC06701,FPC06700,DEB-B259MC1S,PDW08324,PDW08323,B031ND5S,B207LA0S,H080XHXS,B116NC5S,H168XHXS,B100MH0W,FPC06154,FPC06153,PDW06933,FPC07803,FPC07802,L065XG9W,L065XG9S,B138LA2S,B138MB1S,B190MB1S,FPC06152,FPC06151,B055NC5S,FPC06150,B200LA0S,PDW06011,J30XXBA012LX4,J30BJBA022LX2,B058MD7S,FPC06164,B28BJBFN01,PDW05758,B089NC4S,B028RF2S,B260MB2S,FPC06719,B150OG0S,PDW06041,B385MD0S,B062MC55,L050XF9S,B149MC1S,B289KA0S,PDW06398,PDW06399,PDW06038,B381KD0S,J30BLBA012LX4,B040MB5S,B112MB1S,B240LA0S,FPC09291,B259MC1S,H160XHXS,B161LA0S,B038MC9S,B081RC0S,B250LA0S,B280MF1S,L185XF4S,B096QC2S,FPC06913,B305LA0S,B424MB1S,L157XF3W,B120RF0W,L060XD9S,L095XG9S,B479KB0S,L185XF4W,B120RF0S,B039NC5S,FPC07337,ADP09388,B160KA1S,B279KB1S,J30BLBA022LX2,H182XHXS,B144MB1S,PDW07691,B038NC4S,L117XH4S,B097MB0S,L117XH4W,B050ND4S,H026XHXW,B016MD6S,B28BHBFN01,B28BTBFN01,B127MB2S,B165LA1S,J30BJBA012LX4,H060XHXS

选型指南 - KNOWLES - 2023/10/16 PDF 英文下载

【技术】Knowles带您一文读懂微带滤波器

楼氏电容自2020年收购IMC以来，进一步拓展了射频和微波滤波解决方案相关产品系列。在此期间，楼氏电容还就最受市场欢迎的滤波器类型之一——微带滤波器进行了持续创新，并拓展了相关产品系列。本文Knowles将带您一文读懂微带滤波器

技术探讨发布时间 : 2023-03-10

REACH PFAS (per-and polyfuroalkylsubstances) Statement

测试报告 - KNOWLES - 18 August 2023 PDF 英文下载

Resonators & Single Frequency Cavity Resonator

应用笔记或设计指南 - KNOWLES - 2018/4/17 PDF 英文下载

【应用】低加速敏感性、低功耗OCXO恒温晶振EWOS0525助力低轨卫星射频系统

用于低轨卫星等太空的射频设备必须提供非常高的性能，因此内部射频系统一般采用OCXO恒温晶振来提供参考源。在低轨卫星射频系统中，OCXO恒温晶振不仅要求频率稳定度高，还需要具备抗振动和冲击的能力。推荐Syrlinks的恒温晶振EWOS0525，内部采用机械强度高和较低加速度灵敏性的石英谐振器，输出频率10MHz，频率误差±0.5ppm，功耗400mW，是低轨卫星内部时钟源的优秀解决方案。

应用方案发布时间 : 2020-03-04

楼氏电容解析高Q电容器的规格及功用

高Q电容器是电子电路及系统的关键元件，因为它们能够最大限度地减少能量损失并保持高性能。具有低能量损耗，明确的频率响应，低等效串联电阻 (ESR)，低等效串联电阻 (ESR)等特性，可广泛应用于电子电路,射频和微波电路,无线通信设备,电信系统,振荡器和定时电路,医疗设备和科学仪器,航空航天和国防应用,天线系统,电力电子,谐振电路等。

设计经验发布时间 : 2023-12-01