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您好，我想测量由共面带状线（无接地）馈电的印刷偶极子的阻抗。
天线结构包括所提到的共面带状线 - 通过四分之一波长阻抗变换器提供阻抗转换 - 以及偶极子本身（辐射元件）。 CPS线的间隙约为0.2mm。 天线理论上有100欧姆的差分阻抗，这是我试图通过实验证实的。 硬件：E5071C我使用基于同轴电缆的测试夹具获得2端口网络散射参数，然后将其转换为差分1端口网络。 然而，这并未取得良好的结果，这导致我寻找除印刷或芯片巴伦之外的其他选择。 为此，是否有可能在此印刷偶极子上实现精确的阻抗测量？ 我一直在考虑使用差分探头，但我想排除这个选项并将其作为最终解决方案。 我一直在考虑建立一套TRL校准板的可能性，但我不知道这在理论上是否可能实现。 我需要使用上述硬件对这种差分阻抗测量提供一些指导。 最好的祝福， 以上来自于谷歌翻译 以下为原文 Hello, I want to measure the impedance of a printed dipole fed by a coplanar stripline (no ground). The antenna structure includes the mentioned coplanar stripline - to provide impedance conversion through a quarter-wavelength impedance transformer - and the dipole itself (radiating element). The CPS line has a gap of approximately 0.2mm. The antenna theoretically has 100 Ohm differential impedance which is what I am trying to experimentally confirm. Hardware: E5071C I have used a coax-based test fixture to obtain 2-port network scattering parameters and then converting it to a differential 1-port network. However, this did not sorted good results which led to me search for other options excluding printed or chip baluns. Giving this, is it possible to achieve a accurate impedance measure on this printed dipole? I have been thinking using differential probes but I want to exclude this option and take it a ultimate solution. I have been thinking also in the possibility to build a set of TRL calibration boards but I do not know if this is even theoretically possible to achieve. I need some guidance on this differential impedance measure using the hardware described above. Best regards, 
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9个回答
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测量印刷天线，无论是否差分，是非常困难的，因为接地效应可能非常显着。
很可能，差分输入的测量4参数转换为Sdd11并使用该值，是最好的方法。 但是你必须确保正确考虑地面连接。 你能用同轴连接器拍摄你的DUT照片，以显示你在做什么吗？ 以上来自于谷歌翻译 以下为原文 measuring printed antennas, whether differential or not, is quite difficult as the grounding effects can be quite significant. Very likely, the measured 4-sparameters of the differential input, converting to Sdd11 and using that value, is the best way to go. But you have to be sure that the ground connection is properly accounted for. Can you take a picture of your DUT with the coax connectors to show what it is you are doing? |
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脑洞大赛9 发表于 2019-2-20 12:04 使用此夹具的结果（单模式转换为差分混合模式，您称为Sd1d1或Sdd11）相当差。 这是通过在vna上执行短校准以将校准平面移动到夹具的末端“分流”来实现的。 然后将尖端焊接到实际的CPS并开始校准。 这是固定装置（我无法显示实际的天线）：https：//www.dropbox.com/s/tvfrjh9br4ujyzo/3_crop.jpg编辑：tmcp于2014年5月2日上午9:12 以上来自于谷歌翻译 以下为原文 The results with this fixture (single-mode converted to differential mixed mode that you called Sd1d1 or Sdd11) were fairly poor. This was achieved by performing a Short calibration on the vna to shift the calibration plane to end "shunt" of the fixture. Then the tips were soldered to the actual CPS and the calibration was set on. Here it is the fixture (I can not show the actual antenna): https://www.dropbox.com/s/tvfrjh9br4ujyzo/3_crop.jpg Edited by: tmcp on May 2, 2014 9:12 AM |
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您是否首先在VNA上进行完整的2端口校准，然后使用自动（或手动）端口扩展到短路？
或者你只是简单地做了一个简短的反应校准。 后者是不够的。 此外，您的测量频率范围是多少？ 以上来自于谷歌翻译 以下为原文 did you first do a full 2-port calibration on the VNA, and then use automatic (or manual) port extension to the short? Or did you simply do a short response calibraiton. The latter is not sufficient. Also, what is the frequency range of your measurement? |
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是的，我进行了两端口校准，并进行了自动短校准。 但是回到我之前的问题并把这个测试夹具放在一边（谢谢你的故障排除），你知道用CPS测量这个天线的测量解决方案吗？ 没有探头或任何一种平衡 - 不平衡转换器，这是否可以实现？ 测试夹具应该是最好的方法，但我找不到一个很好的施工指南或关于它的精确尺寸的研究文章。 感兴趣的频率是2.45 GHz（范围2.4-2.5）亲切的问候， 以上来自于谷歌翻译 以下为原文 Yes I did the two port calibration and after an automatic short calibration. But returning to my previous question and putting aside this test fixture (thank you for the troubleshooting), do you know of a solution for measuring this antenna fed by a CPS? Is this achievable without a probe or any kind of balun? The test fixture is supposedly the best way, but I can not find a great construction guide or research article on accurate dimensions of it. The frequency of interest is 2.45 GHz (range 2.4-2.5) Kind regards, |
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kgfhdfgx 发表于 2019-2-20 12:48 如果您有DUT的照片或图画，它也会有很大帮助。 它是否有平面图或只有2线连接。 如果没有地平面，那么它使得获得可靠的测量变得更加困难，因为它当然具有地平面（想想“地球”）但是它的定义很差。 从图片中改进夹具的一种方法是在外部导体周围添加铁氧体磁珠，以提高外部导体对地的阻抗，并改善与地面的隔离。 以上来自于谷歌翻译 以下为原文 it would also help a lot if you had a picture or drawing of your DUT. Does it have a ground plan or just 2 wire connection. If there is no ground plane, then it makes getting reliable measurements more difficult because it does, of course, have a ground plane (think "the earth") but the it is poorly defined. one way to improve the fixture from your picture is to add a ferrite bead around the outter conductor, to raise the impedance to ground of the outter conductor and improve the isolation to the earth ground. |
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脑洞大赛9 发表于 2019-2-20 12:57 是的它有一个地面焊接，你可以在之前附上的照片上看到。 图纸在以下链接中：http：//bit.ly/Re0S43我不太明白你添加铁氧体节拍的提示。 亲切的问候， 以上来自于谷歌翻译 以下为原文 Yes it has a ground plane soldered has you can see on the photo attached before. The drawing goes in the following link: http://bit.ly/Re0S43 I did not quite understood your tip on adding a ferrite beat. Kind regards, |
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对不起，我不明白你的问题。
是的，天线没有地平面。 谢谢你的解释。 根据你的射频测量经验，你认为这种带有铁氧体磁珠的结构会得到很好的结果吗？ 亲切的问候， 以上来自于谷歌翻译 以下为原文 Sorry I didn't understood your question. Yes, the antenna does not have a ground plane. Thank you for the explanation. With your rf measurements experience, do you think this structure with a ferrite bead will sort good results? Kind regards, |
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这是我最好的猜测。 您可能需要将天线与附近的任何地面隔离，例如桌面等。 以上来自于谷歌翻译 以下为原文 It would be my best guess. you may need to isolate your antenna from any nearby earth ground such as a table top etc. |
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非常感谢您的解释和建议。 亲切的问候， 以上来自于谷歌翻译 以下为原文 Thank you very much for the explanation and advises. Kind regards, |
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