Because wires and traces are not perfect. They all contain some inductance which impede high frequency currents trying to flow through them.
Needless to say: Radio frequency = really high frequency.
The bad effects are increased noise, voltage spikes when the chip's current demand decreases and voltage dips when the chip's current demand increases.
Grounds like you're seeing on that package can serve several functions.
1) Multiple ground pins/pads reduce the inductance of the ground paths, which is important to reduce ground bounce. Ground bounce is a shift in the ground voltage within the packege (on the die) caused by having multiple outputs switch at the same time (from dV=L(di/dt)). This ...
The electrical reasons for the numerous GND connections are already well described by others. But they are also used to conduct heat out of the module. Find it from the application notes in the datasheet.
The overall product is a "goodnature A24 rat & stoat trap" (made in New Zealand).
You COULD do this "easily enough" electromechanically - and it could be more effective. see - "Another Solution" below
You cannot buy just the portion that you have identified (except perhaps as a spare part at excessive cost) - and it would be of no use to you buy ...
I once used 74HC00 logic biased linearly, as a 200MHz fet probe to capture enough signal from an NE602 oscillator/mixer's tank circuit that the production line could
monitor a spectrum analyzer and set the 3 LOs to 101/107/113MHz.
When first built (my design) I used 2 Inverters in DIP package....the fet-probe oscillated.
cause --- the two inverters *...
Depends on your end application and life time requirment.
We do testing at elevated temperatures around the temperature you have quoted for just few months to assure about the life time of the product. It means, we are already stressing the product and the components.
Depending on the ...
The Raspberry PI can support a camera module that's something like what you'd find in a phone (small camera on a flex mount.) The interface is MIPI CSI-2. There are a number of suppliers who support their specific pinout.
Depending on what supporting hardware you are using, laptop cameras might be interesting. They are small, can be bought for a few dollars only and often connect over USB. If you use a microcontroller that can run Linux, you can probably connect to the camera. See more info in this video: https://youtu.be/CouxmNqxO4A
That sounds like a resistive touch screen membrane,
A long time ago a company called "Koala" did a resistive digitiser pad for "Apple ][" PCs and other 8-bit machines. but these days your best bet is probably to re-purpose a resistive touch-screen digitiser.