Hi ,the community , I would like to measure the small hollow rivet inductance used to make via's in an small power amplifier @2.4GHz(1w) the dimension is the following diameter 1.5 mm lenght 2 mm, I have a HP 8753B to make the measurement , after measuring the value found are more important than the value given from the formula from PUCEL and Goldfarb 3.0, the formula gives a value of 267 pH and the VNA 500 pH, please find enclose the document that described the mode of measurement.

Every information will be grateful

Guy

ON1EV

Every information will be grateful

Guy

ON1EV

First, two rivets to ground won't be 1/2 the inductance of 1 rivet because of mutual inductance between the two. Putting them on opposite sides help but there will still be a mutual inductacne.

Second: the fringing from an SMA connector is likely to be about 70 fF or so, so you have to back out that from the measurement. You are really measuring the parrallel circuit of the fringing cap of the SMA and the inducatance. It's 1 AM in china and too late for me to spin up an ADS simulation, but you get the picture.

Lastly, when you use the rivet, the fringing fields will be entirely different. If you are using it to pass signals from one side of a board to another, it's effective inductance will depend very strongly on nearby grounds. In fact, you could consider that it hasn't any inductance; rather, consider it an transmission line of high impedance. That's the one way to account for the ground effects. The other is to try to model a shunt capacitance.

So, if you can post a drawing of how you intend to use the rivet, I can give a better idea of what to model it as.