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五金

射频同轴开关该如何设计？麻烦详细说说。

射频同轴开关该如何设计？麻烦详细说说。

浏览：42次 | 提问时间： 07-28 05:57

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不想度日如年的一个人过 07-28 05:58

当电路工作频率在射频频段时，设计工程师可选择的板材范围会大幅减小。罗杰斯的RO4835高频线路板板材特别的配方改善了抗氧化性。在一定温度下长期使用，它能提供特别稳定的电性能，同时保持与FR4热固型树脂材料一样的加工优势。同时与RO4350B一样，在10GHz下介电常数（Dk）为3.48，介电损耗（Df）为0.0037，并且具有低的Z轴热膨胀系数（CTE），确保在各种加工和操作条件下金属过孔的可靠性。该材料的X轴和Y轴膨胀系数与铜相近，具有优异的尺寸稳定性。

锦年衍生烦愁 07-28 06:06

完整的型号规格表示法由于分支电缆包含主干电缆和支线电缆。而且两者规格结构不同，因此有两种表示方法：①将主干电缆和支线电缆分别表示，如：干线电缆：FD-YJV-4*（1*185）+1*950.6/1KV支线电缆：FD-YJV-4*（1*25）+1*160.6/1KV这种方法在设计时尤为简明，可以方便地表示出支线规格的不同②将主干电缆和支线电缆连同表示，如：FD-YJV-4电线电缆规格*（1*185/25）+1*95/160.6/1KV这种方法比较直观，但仅限于支线电缆为同一种规格的情况，无法表示支线的不同规格：由于分支电缆主要由于1KV低压配电系统，由此看来其额定电压0.6/1KV在设计标注时，可以省略。一电缆型号-电线电缆规格型号-屏蔽电缆型号-控制电缆型号-通信电缆型号-矿用通信电缆型号-铠装电缆规格型号1）类别：H——市内通信电缆HP——配线电缆HJ——局用电缆
（2）绝缘：Y——实心聚烯烃绝缘YF——泡沫聚烯烃绝缘YP——泡沫/实心皮聚烯烃绝缘
（3）内护层：A——涂塑铝带粘接屏蔽聚乙烯护套S——铝，钢双层金属带屏蔽聚乙烯护套V——聚氯乙烯护套
（4）特征：T——石油膏填充G——高频隔离C——自承式
（5）外护层：23——双层防腐钢带绕包销装聚乙烯外被层33——单层细钢丝铠装聚乙烯被层43——单层粗钢丝铠装聚乙烯被层53——单层钢带皱纹纵包铠装聚乙烯外被层553——双层钢带皱纹纵包铠装聚乙烯外被层2）BV铜芯聚氯乙烯绝缘电线；BLV铝芯聚氯乙烯绝缘电线；BVV铜芯聚氯乙烯绝缘聚氯乙烯护套电线；BLVV铝芯聚氯乙烯绝缘聚氯乙烯护套电线；BVR铜芯聚氯乙烯绝缘软线；RV铜芯聚氯乙烯绝缘安装软线；RVB铜芯聚氯乙烯绝缘平型连接线软线；BVS铜芯聚氯乙烯绝缘绞型软线；RVV铜芯聚氯乙烯绝缘聚氯乙烯护套软线；BYR聚乙烯绝缘软电线；BYVR聚乙烯绝缘聚氯乙烯护套软线；RY聚乙烯绝缘软线；RYV聚乙烯绝缘聚氯乙烯护套软线3）电缆的型号由八部分组成：用途代码-不标为电力电缆，K为控制缆，P为信号缆；绝缘代码-Z油浸纸，X橡胶，V聚氯乙稀，YJ交联聚乙烯导体材料代码-不标为铜，L为铝；内护层代码-Q铅包，L铝包，H橡套，V聚氯乙稀护套派生代码-D不滴流，P干绝缘；外护层代码特殊产品代码-TH湿热带，TA干热带；额定电压-单位KV有关电缆型号的问题
1、SYV:实心聚乙烯绝缘射频同轴电缆
2、SYWV（Y）：物理发泡聚乙绝缘有线电视系统电缆，视频（射频）同轴电缆（SYV、SYWV、SYFV）适用于闭路监控及有线电视工程SYWV（Y）、SYKV有线电视、宽带网专用电缆结构：（同轴电缆）单根无氧圆铜线物理发泡聚乙烯（绝缘）（锡丝铝）聚氯乙烯（聚乙烯）
3、信号控制电缆（RVV护套线、RVVP屏蔽线）适用于楼宇对讲、防盗报警、消防、自动抄表等工程RVVP:铜芯聚氯乙烯绝缘屏蔽聚氯乙烯护套软电缆电压300V/300V2-24芯用途：仪器、仪表、对讲、监控、控制安装
4、RG:物理发泡聚乙烯绝缘接入网电缆用于同轴光纤混合网（HFC）中传输数据模拟信号
5、KVVP:聚氯乙烯护套编织屏蔽电缆

多少人都被愛情傷害了 07-28 06:14

1、电力载波开关，是采用电力线来传输信号的。
2、无线开关，是采用射频方式来传输信号的。
3、总线开关，也称之为第三代开关，是采用信号线来传输信号改善照明质量良好的照明质量是提高工作和学习效率的一个必要条件。智能照明控制系统以调光模块控制面板代替传统的平开关控制灯具，可以有效地控制各房间内整体的照度值，从而提高照度均匀性。

绝心不绝情 07-28 06:23

1、电感式接近开关工作原理电感式传感器由三大部分组成：振荡器、开关电路及放大输出电路。振荡器产生一个交变磁场。当金属目标接近这一磁场，并达到感应距离时，在金属目标内产生涡流，从而导致振荡衰减，以至停振。振荡器振荡及停振的变化被后级放大电路处理并转换成开关信号，触发驱动控制器件，从而达到非接触式之检测目的。
2、电容式接近开关的工作原理电容式接近开关的感应面由两个同轴金属电极构成，很象“打开的”电容器电极，该两个电极构成一个电容，串接在RC振荡回路内。电源接通时，RC振荡器不振荡，当一目标朝着电容器的电接近时，电容器的容量增加，振荡器开始振荡。通过后级电路的处理，将振和振荡两种信号转换成开关信号，从而起到了检测有无物体存在的目的。该传感器能检测金属物体，也能检测非金属物体，对金属物体可以获得最大的动作距离，对非金属物体动作距离决定于材料的介电常数，材料的介电常数越大，可获得的动作距离越大。
3、霍尔开关的工作原理磁式开关是接近开关，它（甚至透过非黑色金属）响应于一个永久的磁场。作用距离大于电感接近开关。响应曲线与永久磁场的方向有关。当一个目标（永久磁铁或外部磁场）接近时，线

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