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You could use coax cable of ANY impedance if the cable length is a multiple of 1/2 wavlength, but that is not a solution for your wideband requirements. It would be VERY difficult to design transformers or matching networks for your targeted WIDEBAND frequency ranges, this will exceed the cost...
What is the purpose of your configuration, why do you use 100 Ohm cables for the 20m section in a 50 Ohm system? Just use 50 Ohm cables and you don't need matching networks.
What equivalent circuit did you use for the capaciators in solution 1? Any series inductance included to model the distributed nature of the capacitor plates?
Yes, but @dome_palp mentioned that he did RLC modeling using Ansys Q3D. That tool can model mutual inductance, so I assumed that the layout model is "good enough".
I'm not sure what you mean here. If you mean extra capacitance: that would be wideband, shifting resonances but not creating extra resonances.
Proximity effect is an inductive effect, and will be captured by the MoM solvers that I mentioned. However from my 25+ years work as an EM specialist...
I fully agree to FvM: separate the problem into (a) EM analysis of the PCB routing and (b) lumped circuit model of the capcitors.
If you are interested in <10 MHz only, the routing can be considered a lumped element itself (series L + R and possibly some small shunt C), so it can analyzed at a...
I'm sure that your "termination" at the end of the bias line in simulation was different than the wire shown in the photo.
If you have multiple samples of your PCB, you could cut one board and measure the impedance into the bias path (with wire attached at the end), then compare that to your EM...
Just use the data and don't worry. The S2P data block performs correctly under all possible source and load impedances, even mixed impedance. The testbench source and load impedance can be very different from the impedance used to create the S2P block, that is perfectly valid.
The issue is that...
Make sure that you set both ports to 50 Ohm (!) when creating the S2P data.
Mixed port impedance for S2P is not supported by many tools.
Of course, in your testbench where you use the S2P elements you can use mixed port impedance, but not when creating the file itself.
The main issue is "stacking distance"
I created a patch array in my EM tool with 6 or 8 identical patches (all same size, not stepped as shown by tony).
I used probe feed so that we have no issue from meandered lines.
With 6 patches spaced at lambda/2, directivity is 14.1 dBi
With 8 patches...
Hi Tobias,
in your measurement you need to make sure that there is no gap in ground at the location that I marked with the arrows. Ideally you would solder the backside ground to the connector body or box, but it seems that your box can't be soldered. Some copper foil should be good enough...
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