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The attenuator I was going to use is this one https://www.digikey.dk/product-detail/en/susumu/PAT1220-C-3DB-T5/PAT123CT-ND/948902
VSWR <1.2 up to 20GHz
This is little bit different CPWG. The S-parameters
The blue traces are S-parameters of the CPWG with installed connectors. The green...
In my application, RL is quite critical. I made this test line to see what RL to expect. For example, I found out that an attenuator that I was going to use, doesn't work well with CPWG. Say, I get 16dB RL with only the transmission line. I installed 3dB attenuator and instead of getting RL 22...
I used RO3006.
I have actually simulated the board last week. The simulated and measured S-parameters are quite similar. The reason why I changed the line width is because I am going to mount different RF components on one CPWG. These components have different dimensions.
This is a test line. I am going to place three different components (IC, bypass cap and atten) on the same line. These components have different dimensions this is why the width and ground spacing of the CPWG changes along the line. I made this first board with EM simulation. The RL is 16dB...
Hi FvM,
Thank you for the reply.
Well, the longer pins have larger surface areas, hence the larger capacitance.
Do you mean that I have λ/4 rotations around the center of Smith chart that convert the stray capacitance to the stray inductance?
Hi,
I have an RF PCB with CPWG that changes it's sizes.
See the attached photo. I wanted to measure this board with a VNA. I first attached SMA connectors with long (4mm) central pins (the top PCB on the photo). The RL was not that great. I then thought that it is affected by stray...
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