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I think you get radiation loss from folded lines discontinuities, which straight lines don't have.
Try using inset feeding, which somehow compensate the small length of the lines, which also give less mutual coupling between patch elements, resulting in higher array gain.
Try using straight lines between antennas:
https://www.mdpi.com/remotesensing/remotesensing-14-03597/article_deploy/html/images/remotesensing-14-03597-g001.png
The gain difference between 25dB and 60dB is huge..
For 25dB gain and desired bandwidth you may use a gain block MMIC type schematic with SiGe transistors which are still available from NXP or Infineon...
To meet in the same time the 60dB gain, ripple +/- 1.5dB and VSWR 1.3:1 over the band, is not an easy job.
Generally there are no RF systems to need 60dB gain from the LNA. This high gain LNA always will give troubles. No wonder that the spec is looking for a reliability MTBF time, which is...
One thing that I can say for sure, UARTs have some of the noisiest buses from all digital circuits.
So staying with your RF lines away from them is mandatory.
The PA most important parameter that needs to be tested under mismatch conditions is ruggedness.
Other PA parameters that have to be tested are: stability, linearity, output power, efficiency.
A basic setup to test those parameters is...
Your assumption is correct.
For example if you have 3 cascaded stages: LNA=4dB_NF 15dB_Gain, Mixer=9dB_NF 8dB_Gain, and IF-amp= 10dB_NF 20dB_Gain, the total noise figure will be 4.44dB and total gain 40dB.
The theoretical gain (ignoring losses and mutual coupling) of a 6x1 elements antenna array (with half-lamda spacing between elements) is 17.8dB, with 7x1 elements is 18.5dB and with 8x1 elements is 19dB.
What I found is that using circular patch elements (with inset feeding), the mutual...
I think few readers here didn't catch the thing that what I mentioned in #4 was a joke.
From my experience dealing with high power transmitters I can say that when I used a well designed transmitter having a well designed VSWR protection, the worst enemy is not a shorted load or an opened load...
"When reflected power encounters a mismatch at the load, its phase is reversed and heads back to the transmitter, where it encounters a large impedance mismatch so is totally reflected back to the load where it is eventually radiated."
We have four steps:
1. Initially the power goes to a...
This is the SMA connector used:
https://www.elecbee.com/en-17507-sma-female-connector-12-7mm-500-square-flange-w-cylindrical-contact-8
https://www.mouser.fi/images/marketingid/2021/img/106006269.png?v=011924.1014
There is a confusion. In normal FMCW radars, the range of the period of the chirp is between few microseconds up to hundreds of microseconds.
I think your request for nanoseconds range is meaningless.
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