楼氏电容开发的薄膜微带技术，可解决微带滤波器的损耗问题

时间： 2023-04-19 来源：Knowles楼氏电容公众号

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克服微带滤波器的损耗问题

与其他传输线或波导滤波方案相比，微带滤波器最大的问题在于损耗。可喜的是，随着高K值系列材料（如楼氏电容的PG、CF和CG陶瓷材料等）的拓展，如今射频工程师已能够开发出低损耗的微带传输线滤波器。

如图2所示，使用普通RO4350 LoPro电介质的微带滤波器与使用PG陶瓷介质的微带滤波器的损耗作了对比——两款配置均应用了相同的材料厚度、金属导电性和50Ω的微带传输线。

图2. (a)展示了损耗/英寸，（b）展示了损耗/波长

除了降低损耗外，滤波器制造商如果同时也作基板的工程设计，这就能得到另一个关键益处——可大幅缩短沿微带传输线传播的电磁波波长。就微带线而言，波长的计算公式如下：

Λ = 微带中的波长

λ = 自由空间的波长

ε_eff = 有效介电常数，取决于基板材料的介电常数和微带线的物理尺寸这两个因素

以楼氏电容（KPD）制造的标准品表贴式带通滤波器 B099NC4S为例，它是一个常见的X波段滤波器。该滤波器的尺寸为10.2mm x 3.8mm，或者可以12GHz的自由空间波长（0.4λ x 0.15λ）表示。楼氏电容可基于自主研发基板材料的技术优势来缩短滤波器内的波长（参考上述公式），这样，相比滤波器外部（如自由空间）的任何辐射，滤波器自身都会显得相当小巧、紧凑。

这意味着楼氏电容能够开发出小型的微带表贴技术，而这正是毫米波（mmWave）应用的理想之选。由于楼氏电容能使mmWave天线的物理尺寸尽可能缩小，因此可直接使用微带方案在芯片或PCB上建立复杂的天线阵列。进而，含天线、耦合器、滤波器和功分器在内的整个设备都可以通过在基板上创建金属化图案来实现。

楼氏电容（KPD）的微带滤波器性能介绍

楼氏电容（KPD）的薄膜微带技术可提供各类带通滤波器、低通滤波器和高通滤波器，频率范围从1GHz到42GHz（及以上），如图3所示：

楼氏电容（KPD）的微带滤波器具备以下主要优势：

-55℃至125℃下的温度稳定性；
相比使用传统的印刷线路板，使用楼氏电容（KPD）的CG材料，滤波器的尺寸可缩小为原来的1/20，使用CF材料可缩小为1/10，使用PG材料可缩小为1/3；
高重复性，因为薄膜制造提供了精确的制造性能，无需调整。

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本文由成长的人生转载自Knowles楼氏电容公众号，原文标题为:楼氏洞察｜如何解决微带滤波器的损耗问题？，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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General and Technical Introduction SM EMI Filters Panel Mount EMI Filters Discoidals, Planar Arrays and Special Filters

KNOWLES - SM FILTERS,盘状电容器,表面贴装过滤器,SURFACE MOUNT EMI FILTERS,SURFACE MOUNT C FILTERS,RESIN SEALED CERAMIC THREADED PANEL MOUNT FILTERS,SOLDER-IN PANEL MOUNT EMI FILTERS,表面贴装PI过滤器,穿心片状电容器,SOLDER-IN PANEL MOUNT FILTERS,EMI滤波器,PI FILTERS,表面贴装C型滤波器,DISCOIDAL CAPACITORS,X2Y INTEGRATED PASSIVE COMPONENT,SURFACE MOUNT PI FILTERS,PLANAR CAPACITOR ARRAYS,焊接面板安装过滤器,PANEL MOUNT EMI FILTERS,EMI FILTERS,SURFACE MOUNT FILTERS,DISCOIDAL ARRAYS,FEEDTHROUGH CHIP CAPACITORS,面板安装EMI滤波器,RESIN SEALED CERAMIC THREADED PANEL MOUNT EMI FILTERS,平面电容器阵列,树脂密封陶瓷螺纹面板安装过滤器,PLANAR ARRAYS,X2Y集成无源元件,SFAJL5000471MX,SFBDC5000220ZC,SFSUC5000150ZC0,SFBDT5000102MX,SFCMC5000333MX,SFBCC5000102MX,SFJGL5000224MX,SBSGC5000102MX,SFCDC5000681MX,SFBLL5000333MX,SFABL5000102MX,SFKKC5000330ZC,SFBML5000100ZC,SFAKT1000104MX,SFBML5000151MC,SFJNL2K00331MC,SFBCL5000681MX,SFCML5000221MC,SFJGL2K00471MC,SFKKT5000103MX,SFJNL2K00682MX,SFJGL1K00223MX,SFSUC5000680MC0,SFABC2000683MX,SFJGL1K00683MX,SFAKT5000681MX,SFBMC5000102MX0,SFABC5000103MX,SFBCL1000104MX,SFLMC1000104MX,SFBCP5000442ZX,SFBDT5000333MX,SFJNL2K00222MX,SFJGC2000105MX,SFJGP5000944MX,SFAJC5000472MX,SFBCP5000200ZC,SFAAC,SFCMC5000104MX,SFSUC5000683MX0,SFBDL5000470ZC,SFBCC5000333MX,SFKKC5000152MX,SFKKT5000101MC,SFCML5000683MX,SBSGC5000333MX,SFBDP5001N36MX,SFBDP5000443MX,SFBDC5000100ZC,SFBMP5000302MX,SFBDT5000331MC,SFTMC5000470ZC,SFABL5000333MX,SFBDT5000222MX,SFCDL5000471MX,SFBDC5000151MC,SFBDP5000201MC,SBSGC5000222MX,SBSMP5000152MX,SFAJC5000221MC,SFJNL2K00102MC,SFKKT5000332MX,SFKBL5000470ZC,SFKKL5000220ZC,SFLMP0500304MX0,SFAJC1000104MX,SFBCL5000101MC,SFBLL5000331MC,SFJGC5000334MX,SFCDL,SFCDC5000101MC,SFABL5000682MX,SFAJL5000153MX,SFBDP5000663MX,SFJGC3K00151MC,SFCDP,SFCMC5000222MX,SFJGC2K00472MX,SFKKT5000223MX,SFBML5000153MX,SFBCC5000150ZC,SFJNC2K00103MX,SFBCC5000682MX,SFBLL5000222MX,SFCDC,SBSMC5000472MX,SFABL5000150ZC,SFBDT2000473MX,SFBMT2000683MX,SFBMC5000472MX,SFCDC5000332MX,SFLMT5000100ZC,SFBCL5000332MX,SFLMC5000101MC,SFCDL1000474MX,SFJNL1000155MX,SFTMC5000333MX,SFLML5000680MC,SFAAC5000100ZC,SFCDC5000683MX,SFBCC2000473MX,SFKKL5000100ZC,SFABL5000680MC,SFLML5000153MX,SFKKT5000681MX,SFKKL5000151MC,SFABC5000101MC,SFAAC5000151MC,SFKKT5000221MC,SFBCC5000680MC,SFABL2000473MX,SFJNC0500335MX,SFTMC5000150ZC,SFSUC5000223MX0,SFCDP5000942MX,SFAKL2000683MX,SFCDL5000153MX,SFUMC5000220ZC,SFABC5000332MX,SFAKL5000332MX,1206Y1000103MXTE07,SFLML2000473MX,SFLMT5000151MC,SFLMC5000221MC,SFBLC5000332MX,SFBLC2000683MX,SFDPP0500944MX0,SFSRC5000220ZC0,SFAAC5000471MX,SFCMC5000102MX,SFLMP5000942MX,SFBDP5000301MC,SFCMC2000224MX,SFBCL2000683MX,SFCML5000681MX,SFAJC5000681MX,SFAJL5000100ZC,SFBLL5000102MX,SFCML5000472MX,SFKKT1000104MX,SBSPP1000682MX,SFBCL5000221MC,SFBDT5000150ZC,SBSGC5000682MX,SFAJL5000151MC,SFCDC5000221MC,SFBCP5000202ZX,SFLMC5000223MX,SFBML5000220ZC,SFABC5000223MX,SFJGP1K0136NMX,SFBDP5000203MX,SFKKT2000683MX,SFAKC5000470ZC,SFLMC5000332MX,SFCMC5000150ZC,SFKBL5000682MX,SFAAC5000153MX,SBSMC1000224MX,SFBDC5000153MX,SFJNC2K00332MX,SFLMT5000220ZC,SFAKT5000472MX,SFBLL5000150ZC,SFJGL5000104MX,SFLML5000471MX,SFSTC5000101MC0,SFJGC2K00103MX,SFAJL5000331MC,SFTMC,E01,SFBCP1000443ZX,E03,SFAKC5000152MX,SFAAC2000473MX,SFCDL5000102MX,E07,SBSGP5000222MX,SFBMC5000681MX,SFBMT5000220ZC,SFUMC0500154MX,SFJGL2K00331MC,SFUMC5000680MC,SFAJL5000682MX,SFKBL5000222MX,SBSGP0500224MXB,SFAJL5000222MX,SFBMP2000943MX0,SFKBC5000103MX,SFAJC2000683MX,SFJGP2K00302MX,SFKBL5000331MC,SFCDC5000154MX,SFKKC5000470ZC,SFBCC5000471MX,SBSMP5000472MX,SFJGL2K00682MX,SFBLC5000220ZC,SFABL5000471MX,SFKBC5000223MX,SFCMC5000473MX,SBSMC5000683MX,SBSMC5000223MX,SFJNC2000105MX,SFLML5000220ZC,SFJGL2K00222MX,SFAKL5000220ZC,SFTMC5000330ZC,SFBMP5000442MX,SFCML0500684MX,SFLMT2000683MX,SFBLC5000151MC,SFKBL5000102MX,SBSPP1000222MX,SFSUC1000334MX0,SFTMC2000473MX,SFCMC,SFAKT5000152MX,SFBML0500154MX,SBSGC5000473MX,SFCDL5000222MX,SFCML,SFBML5000471MX,SFAAC5000220ZC,SFAJC5000330ZC,SBSGP5000102MX,SFBLL5000680MC,SFJNL5000154MX,SBSMC5000332MX,SFUMC5000101MC0,SFLML5000151MC,SFCMC5000680MC,SFBMC1000104MX,SFJGL0500335MX1,SFBLC5000681MX,SFAKT2000683MX,SFLMC5000103MX,SFKBL2000473MX,SFBMT1000104MX,SFCDL5000331MC,SFBCC5000102MX0,SFBDT5000470ZC,SFAKL5000100ZC,SFJGP2K00942MX,SFLMC2000683MX,SFLML5000100ZC,SFLMT5000103MX,SFBLP0500943ZX,SFJGC2K00332MX,SFAKL5000151MC,SFAKL5000681MX,SFBLC5000100ZC,SFBMP5000662MX,SFCML5000103MX,SFKBL5000333MX,SFBMP5000940ZC,SFUMC5000151MC,SBSGC5000153MX,SFSTC5000472MX0,SFBMC5000330ZC,SFSTC5000102MX0,SFAJL0500154MX,SFKBL5000150ZC,SFKBC5000221MC,SBSPP1000102MX,SFBCL5000472MX,SFCMC5000331MC,SFBDT5000102MX0,SFUMC5000100ZC,SFCDL5000680MC,SFJGC0500335MX,SFAKL5000472MX,SFKBC5000101MC,SFBMT5000153MX,SFSUC5000332MX0,SFABL,SFBLC5000472MX,SFCDC5000472MX,SFBCP5000941ZX,SFBDL5000330ZC,SFBCL5000152MX,SFCDC5000152MX,SFABC,SFCDP5000302MX,SFAKL1000104MX1,SFJGC2K00681MC,SFBMT5000100ZC,SBSMC2000154MX,SBSMP2000104MX,SBSGP0500224MX,SFJNL1K00153MX,SFSRC0500473ZX0,SFAJL2000683MX1,SFBLC5000153MX,SFJGP2000205MX,SFBDP5000661MC,SFAKL5000153MX,SFJGL2K00102MC,SFKKL2000683MX,SFCDL5000682MX,SFBMP50013N6MX,SFBMT5000151MC,SFCML5000332MX,SFCDL5000473MX,SFKBC5000332MX,SFBDL5000152MX,SFBLP2000203ZX,SBSMC5000103MX,SFBMP5000202MX,SFAKT5000330ZC,SFBLL0500154MX,SFJNC3000684MX,SFJGL1000225MX,SFBDC2000683MX,SFUMC5000471MX,SFCML5000101MC,SFSUC5000220ZC0,SFBML5000680MC,SFAJL5000680MC,SFBLL5000682MX,SFBMC5000152MX,SFAKC5000330ZC,SFCML5000223MX,SFSTC2000473MX0,SFBDP5000441MC,SFJGC1K00333MX,SFAJC5000152MX,SFUMC5000153MX,SFCMC5000682MX,SFJGP1K00943MX,SFBDC5000331MC,SFBDT5000330ZC,SFLMT2000473MX,SFBDC5000222MX,SFBDP5000941MX,SFCDP5000661MC,SFBCC5000151MC,SFCDP5000201MC,SFBCC5000100ZC,S,医学,CIVIL AVIATION,汽车,INDUSTRIAL,SPACE PROJECTS,AUTOMOTIVE,赛车运动,军事航空,DOWNHOLE,OIL,RAIL,民航,铁轨,WORLD RALLY,油,MEDICAL,MOTORSPORTS,空间项目,世界拉力赛,MILITARY AVIATION,工业,井下的

2022/8/25 - 选型指南 - v4 代理服务技术支持采购服务

B100MD2S 10GHz表面贴装带通滤波器

该资料介绍了Knowles Precision Devices公司生产的10GHz表面贴装带通滤波器B100MD2S。该滤波器采用低损耗温度稳定材料，具有小型化、全屏蔽、宽温度范围工作特性，适用于多种频率带，提供高度可重复的性能。

KNOWLES - SURFACE MOUNT BANDPASS FILTER,BANDWIDTH LOW LOSS CATALOG FILTER,带宽低损耗目录滤波器,表面安装带通滤波器,B100MD2S,B100MD2S-T

July 2024 - 数据手册代理服务技术支持采购服务

【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

2023-03-10 - 技术探讨代理服务技术支持采购服务

【技术】解析滤波器的形状因子和选择性

本文中Knowles将为大家介绍滤波器的形状因子和选择性。

2023-03-23 - 技术探讨代理服务技术支持采购服务

B100JB5S 10GHz表面贴装带通滤波器

该资料介绍了Knowles Precision Devices公司生产的10GHz表面贴装带通滤波器B100JB5S。该滤波器采用低损耗温度稳定材料，具有小型化、全屏蔽、温度稳定性好等特点，适用于多种频率范围，提供高度可重复的性能。

KNOWLES - SURFACE MOUNT BANDPASS FILTER,NARROW BANDWIDTH LOW LOSS CATALOG FILTER,表面安装带通滤波器,窄带低损耗目录滤波器,B100JB5S-T,B100JB5S

July 2024 - 数据手册代理服务技术支持采购服务

H160xHxS 16.0GHz表面贴装高通滤波器

该资料介绍了Knowles Precision Devices公司生产的16.0GHz表面贴装高通滤波器H160XHXS。该滤波器采用高介电陶瓷材料，具有小型化设计、全屏蔽组件和温度稳定性等特点。它适用于高频衰减应用，提供多种频率选择。

KNOWLES - HIGH FREQUENCY SURFACE MOUNT CATALOG HIGHPASS FILTERS,表面贴装高通滤波器,SURFACE MOUNT HIGHPASS FILTER,高频表面贴装目录高通滤波器,H160XHXS-T,H160XHXS

Feb 2024 - 数据手册代理服务技术支持采购服务查看更多版本

B192NB2S 19.2GHz表面贴装带通滤波器

该资料介绍了Knowles Precision Devices公司生产的19.2GHz表面贴装带通滤波器B192NB2S。该滤波器采用低损耗温度稳定材料制造，具有小型化设计和高重复性性能。其主要特性包括小尺寸、全屏蔽组件、焊盘表面安装包装、MSL1级防潮等级、频率稳定性以及宽工作温度范围（-55°C至+125°C）。此外，还提供了插入损耗、反射损耗、边带抑制比等电气规格。

KNOWLES - SURFACE MOUNT BANDPASS FILTER,SURFACE MOUNT CATALOG BANDPASS FILTERS,目录BPF,表面贴装目录带通滤波器,表面安装带通滤波器,CATALOG BPF,B192NB2S-T,B192NB2S

May 2024 - 数据手册代理服务技术支持采购服务