Well, the longer pins have larger surface areas, hence the larger capacitance.How can you know if the connector effect is inductive or capacitive?
Do you mean that I have λ/4 rotations around the center of Smith chart that convert the stray capacitance to the stray inductance?The structure involves multiple λ delay
Your S11 plot shows the superimposition of two connectors and all the discontinuities along the line. A transformation into time domain (TDR display) can show the location of impedance discontinuities.Do you mean that I have λ/4 rotations around the center of Smith chart that convert the stray capacitance to the stray inductance?
why are you using stepped transmission line width?
I totally forgot that the physical length of the board is larger than the wavelength! My bad.The Characteristic Impedance varies along the line.So,what you would expect rather than that ??
-Which substrate you have been using for 4GHz ?? Characteristics ??I made this board WITHOUT EM simulation.
If you intend to mount some SMD components, there is no sense to talk about the Characteristic Impedance of the Transmission Line.It will show somehow discontinuities along the line and each node will have different impedance value.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.
The stepped line width it going to make extracting the properties of components soldered along the line quite difficult. The same will apply to parasitics in the line itself. You're just making things difficult for yourself.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.
Say, I get 16dB RL with only the transmission line. I installed 3dB attenuator and instead of getting RL 22 dB I got RL 14 dB!
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