EEVblog Electronics Community Forum
Electronics => RF, Microwave, Ham Radio => Topic started by: Cacao on August 06, 2017, 11:03:06 am
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Can anyone give me advice on designing two port network, here is the plan: https://ibb.co/jCHVev (https://ibb.co/jCHVev)
Operating frequency: 2-3GHz
Thank you guys!
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That's a directional coupler, which is either a three- or four-port device.
In your case it's configured as a three port, the "fourth port" goes directly to a dummy load.
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That's a directional coupler, which is either a three- or four-port device.
In your case it's configured as a three port, the "fourth port" goes directly to a dummy load.
Can you give me some things to consider when designing it?
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It is probably simpler to get good results with an RF directional bridge instead of a coupler for a beginner.
Assuming you don't need to handle high power.
Good info on both approaches can be found in this impressive VNA project:
Coupler:
http://hforsten.com/cheap-homemade-30-mhz-6-ghz-vector-network-analyzer.html (http://hforsten.com/cheap-homemade-30-mhz-6-ghz-vector-network-analyzer.html)
Bridge:
http://hforsten.com/improved-homemade-vna.html (http://hforsten.com/improved-homemade-vna.html)
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Can anyone give me advice on designing two port network, here is the plan: https://ibb.co/jCHVev (https://ibb.co/jCHVev)
Operating frequency: 2-3GHz
Thank you guys!
If you don't have a possibility to reach a EM simulator, I'd recommend you to use commercial products such as
http://www.yantel-corp.com/en/products/datasheel/DC/DC2500P02.pdf (http://www.yantel-corp.com/en/products/datasheel/DC/DC2500P02.pdf)
There are also other different manufacturers.The component that you're looking for "Directional Coupler".
It's a 4 port device and forward and reflected power can easily be measured.
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Do you guys know how can I change the operating frequency of a wilkinson power divider such as this into 2.5GHz? https://www.cst.com/academia/examples/wilkinson-power-divider (https://www.cst.com/academia/examples/wilkinson-power-divider)
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Here is the function of this network. As I supply a microwave signal (2.5GHz) into one of its ports, that signal will go to the probe that is attached to some material. The reflected signal from the probe then will be detected by the rf detector. Do you think a power divider or a directional coupler can be used?