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I think there is a confusion between speed (velocity) of a mobile phone (affected by the Doppler phenomenon) and speed of data (throughput).
Those two things have totally different meanings..

Theoretically, in a real life, P1dB is more important than IP3, because IP3 value is an imaginary point (never reached) that indicates when the amplitude of the 3rd order products equals the input...

Any lumped component Band Pass Filter with central frequency greater than about 500MHz would be very sensitive to component tolerances, to PCB layout, and especially to temperature variations.
May...

Both, GSM and WCDMA should support speeds up to 250 km/h.

https://optiwave.com/optifdtd-manuals/fdtd-2d-total-field-scattering-field-tfsf-region/

Spherical coordinate system used to plot radiation patterns

This one is 20 bucks, it has a digital display, and is working unbelievable well:
...

On this Johanson webpage is a lot of information how to tune this kind of antenna:

http://johansontechnology.com/tuning

You have to re-design the PCB and get space for 3 matching components (Pi...

Your calculation of the new 50 ohms transmission line is good (from FR4 to Polyimide).
The only thing that I see is that you don't have any impedance matching components for the Johanson antenna....

I didn't say that you have to include 50 ohms shunt resistors.
The attenuators should have 50 ohms input/output impedance (Zo).
Here you can find few options how to design these attenuators, and...

volker, no problem. I was sure that was a misunderstanding.

neazoi, your circuit in post #6 will not do the job, because the overall input and output return loss of the group is not very good....

Your idea it will work somehow, and the explanation is this:
A 10dB attenuator will have the input return loss (S11) better than -20dB whatever the output terminated impedance is (anywhere between...

Yes, the output level of the AD9851 is just below 0dBm with few dB. You need an amplifier which will provide also the necessary output impedance.
...

Matching, if is well done and tuned, will decrease the insertion loss of the mixer.
If is not designed well the mixer may have higher insertion loss compared with no matching at all.
The matching...

The AWG presented in the link below, perhaps is the only device on the market that goes up to 600MHz. Usually the AWG generators sold by the big manufacturers goes only up to 120MHz.
In the link is...

<50W if the Radar receiver do not use continually rotating antenna (mechanical).

For sure is about the response of a transmission line...you mentioned, you don't have lengths greater than 10cm.
Sometime a simple impedance matching at TL ends (using distributed elements) would...

Mobile device 5G antenna specification? There is no clear antenna specification not even for 4G, 3G or 2G mobile phones.
Sometime is mentioned the OTA test (over the air) that have to pass,...

At some universities this learning is a two year master degree process..
During centuries there is a long list of self-taught scientists (da Vinci, Edison, Tesla, Heaviside, etc.) but is very hard...

I am not an expert on this domain but from what I heard, gold plated aluminum is the choice for high frequency Cassegrain reflector antennas.
Most manufacturers don't specify this, they mention just...

I think you can plot the SWR circle, and not the return loss.

You just answered yourself to your initial question...

The impedance matching network could be either single-band or wide-band.
The antenna could be designed to get good VSWR for single-band, for dual-band (or multiple bands), or for wideband.

If you...

I think your definition "ingress effect" can be given by the "shielding effectiveness" which is a characteristic mentioned in most of the (good) coax cables data sheets.
For example the double...

The transmitter output power of the S4100 module is 200mW. To get more signal strength you need to use an external power amplifier. I assume couple of watts (maybe less) will provide your desired...