Those capacitors are required for the antenna matching (TBD stands for To Be Decided), the value of the capacitors is dependent on the antenna you are going to place on your board, on the expert kit dev boards those caps are not placed since you can place any antenna you want. If the antenna you are going to place is at 50 ohms you wont have to place any matching circuit.
亲爱的mt_dialog， Thanks for your suggestion. 最近我们已经购买了具有印刷天线的物联网传感器套件，我们用手机测试了电路板，几乎没有支持5米的范围，但我们需要更多更多的范围。因此，在我们的自定义板中，我们计划拥有外部SMA连接器而不是PCB天线。在不连接外部天线的情况下，可以支持的最大范围是多少，但是电路板将具有SMA连接器提供。考虑视线和没有障碍物。
尊敬的先生， Actually Our requirement is, at least BT device should support 30 meter without connecting External Antenna so which antenna circuit is better either PCB antenna or external Coaxial Switch(without connecting Ext Antenna case i need). Is there any external circuit which will increase the range because we have tested with TI sensor tag without connecting External Antenna it goes up to 30 meter (without line of sight and obstacle case) (Please ref schematic :http://www.ti.com/lit/df/swrrr134/swrr134.pdf.) and in Schematic there is a external circuit in the RF side, Is it for increasing the range or Is it for antenna impedence matching. 一个澄清,覆盖范围取决于internal processor design or can we increase the range by adding external circuits (except external antenna connection since our board size is very small (similar to dialog IoT sensor board) , we don't want to keep external antenna).
嗨karthikeyan s，
请查看跟踪天线PCB参考设计的参考设计部分，您还可以查看文档AN-B-027和AN-B-036以获取更多信息。
谢谢mt_dialog.
你好，
我已经提到了AN-B-027 Doc，他们已经解释了关于印刷的PCB天线，但我们正在寻找外部同轴天线电路，以便我们可以连接外部天线以增加范围。请用外部天线连接器建议参考设计
嗨karthikeyan s，
大多数参考设计都使用印刷天线，您可以检查使用同轴天线的专家套件的子板。但由于您想要设备上的同轴天线，您需要的是50欧姆的带线和50欧姆同轴连接器。您可以在专家套件部分上找到开发套件选项卡中的所有文件。
谢谢mt_dialog.
嗨mt_dialog，
谢谢你的宝贵意见。
外部同轴天线在视线上考虑的外部同轴天线覆盖多少范围。
嗨karthikeyan s，
SMA天线的辐射效率平均为-2dB。但取决于方向和高程，它可以少得多。如果我们使用专家套件提供的SMA天线，它可以低至-25dB（最坏情况）。
假设理想的天线（0dB增益）和视线，没有障碍，理论范围超过100米。路径损耗为92dB，这是由580链路预算涵盖的。
如果天线使我们具有-25dB增益（链接预算= 67 dB），则该范围仅限于约15米。
谢谢mt_dialog.
亲爱的mt_dialog，
感谢您的信息，
SMA连接器附近有一个两个电容器，专家套件，子板原理图。这些电容器值已被提及为TBD。请告诉我这些电容器的值（C14和C15）。
嗨Karthikeyan，
Those capacitors are required for the antenna matching (TBD stands for To Be Decided), the value of the capacitors is dependent on the antenna you are going to place on your board, on the expert kit dev boards those caps are not placed since you can place any antenna you want. If the antenna you are going to place is at 50 ohms you wont have to place any matching circuit.
谢谢mt_dialog.
亲爱的mt_dialog，
Thanks,
如果我们将天线放置50阻抗，则需要零欧姆电阻。
亲爱的mt_dialog，
是否有关于PCB跟踪宽度和迹线长度的约束，该迹线将用于外部天线的SMA连接器，因为它将类似于传输线，这可能进一步增加或减小阻抗。
嗨karthikeyan s，
是的，从RFIOP引脚运行的PCB跟踪必须接近50OHM，如果这完整地完成（迹线的突然变化，而不是迹线下的实体接地平面），则长度并不重要。宽度由板属性和思想（与地层距离）决定。不需要零欧姆电阻。此外，还必须施加靠近RFIOP引脚的分流电感器。3.33为WLCSP，3.9 n为QFN包装，即在专家套件子板上错过，它稍后一下，可以检查583个子子板，以检查电感与同轴天线的放置。
谢谢mt_dialog.
亲爱的mt_dialog，
Thanks for your suggestion.
最近我们已经购买了具有印刷天线的物联网传感器套件，我们用手机测试了电路板，几乎没有支持5米的范围，但我们需要更多更多的范围。因此，在我们的自定义板中，我们计划拥有外部SMA连接器而不是PCB天线。在不连接外部天线的情况下，可以支持的最大范围是多少，但是电路板将具有SMA连接器提供。考虑视线和没有障碍物。
嗨Karthikeyan S.
连接器本身不会辐射大量，从经验中，连接的PCB迹线将辐射更多。多远取决于PCB结构，迹线的长度等，但我不认为这将达到超过1米。
谢谢mt_dialog.
尊敬的先生，
Actually Our requirement is, at least BT device should support 30 meter without connecting External Antenna so which antenna circuit is better either PCB antenna or external Coaxial Switch(without connecting Ext Antenna case i need). Is there any external circuit which will increase the range because we have tested with TI sensor tag without connecting External Antenna it goes up to 30 meter (without line of sight and obstacle case) (Please ref schematic :http://www.ti.com/lit/df/swrrr134/swrr134.pdf.) and in Schematic there is a external circuit in the RF side, Is it for increasing the range or Is it for antenna impedence matching.
一个澄清,覆盖范围取决于internal processor design or can we increase the range by adding external circuits (except external antenna connection since our board size is very small (similar to dialog IoT sensor board) , we don't want to keep external antenna).
嗨karthikeyan s，
有关物联网传感器，请检查您的其他帖子http://support.dialog-semicondiondiondiond.com/iot-sensor-kit-range.。
谢谢mt_dialog.