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Not sure if I understand your question correctly. Delta F is the frequency operation bandwidth. The meaning of this equation is basically telling you that you can increase your operation bandwidth by reducing the Q factor.
As I remember the input impedance is much more important to an LNA and the LNA gain is independent to S22. Gamma output is derived from S11 and Gamma load should be conjugate matched with Gamma output.
If your chip solution already support MIMO then MIMO will be better and more simple. I read some online info saying that MIMO reduce indoor fading which could gain around 10dB.
1. Narrow down the sweep freq also reduce the sweep point.
2. combine small element into one big element
3. One more suggestion but need to be careful is that if your antenna array is a patch design facing z direction for example, you can try to reduce the radiation box at x and y direction. I...
if you have an VNA you maybe you can measure the phase or group delay at a specific freq and then transfer it back to the actual length. Measuring S11 doesn't work for your case.
It depends on the frequency you want to decouple, basically you need to find a value with the SRF is slightly higher than your decoupled freq and the |Z| should be less than 5ohm (1/10 of 50ohm should be good enough for decoupling).
There is a useful online tool from Murata called Simsurfing...
Not sure what is the material of that waterproof box, assuming it is not metal? Then maybe the loss of that 5m cable + mismatch loss cause by the soldering is bigger than the attenuation cuased by the box...
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