When approaching these issues, myself, I embrace the "expand your thinking" rather than "think outside the box."
I understand physics to work in certain ways, and to abide by certain laws. The production of beat frequencies by constructive and destructive interference is one thing - but the nature of this frequency is not quite the same as a true low frequency signal. At least as I understand it to work.
It is a phenomenon I need to do further research on to be certain I am doing more than speaking from assumption, to be sure - but in the case of constructive and destructive interference - I could similarly use a set of, say, LEDs set with a frequency difference to produce a 'beat' within the RF spectrum. This does not mean I can pick up that RF signal using an antenna, nor does it mean that the RF 'beat' will penetrate materials different from how light would behave.
I am, also, generally suspect of the notion that the cabal has extensive knowledge of technologically complex things. In my assessment of them, they are generally very focused social predators - extremely effective at manipulating hierarchies and social connections to get what they want, but often very ignorant outside of that - (or only as knowledgeable as they need to be in order to achieve victory over their target). They are very similar to people with Asperger's, in that regard - collecting many bits of information in order to feel like they are a certain type of person, but rarely following through on the subject. Such as Aspies who collect cameras without an interest in photography or tools without an interest in shop hobbies.
Information and technical understanding tend to be antithetical to the cabal's structure. Lynn isn't out there blasting people with microwaves and seeing how they react. The people with the technical understanding to create the types of things we are talking about would generally be extremely suspect of their existence and anyone taking an interest in that technology.
In light of all of this, I generally hold that we should try to work from 'normie physics' out to 'conspiracy physics' in an attempt to prevent ourselves from adopting 'troll physics.'
Microwaves and many radio waves do not penetrate very deep into water or our bodies. Radio has a bit of an advantage over microwaves in this regard, but the question then becomes how this lower frequency wave would be perceived. While electricity and EMF can be used to alter chemical reactions and other such biological functions - this is a very early field of research and what is published is generally in relation to very high field strengths with relation to catalytic reactions. While there could be some effects of LF and ELF on biochemistry or neurology - I need a bit more experimental or field study data to go on to really set my foot down on that idea. I can entertain it and work on further ideas - but I am in 'I am purely amusing my own curiosity' mode - 'Outside the box' thinking where the potentially irrational is embraced for the sake of fun and creativity.
Phased arrays use shifting of the time domain to create 'beams' of concentrated energy using simple dipole antennas with no 'optics' to focus the beam. This is relatively old technology - some of the oldest examples of this date back to the 1910s, of course, in very rudimentary form. Today's DSPs and FPGAs allow for more than passive phase shifting and for elements to emit their own specific frequencies, allowing for far more fine tuned control over the output beyond phase shifting.
In theory - any modern solid state radar array is likely capable of being programmed to do a wide range of microwave-related tasks. From using it to cook sandwiches arrayed on a table in front of it, to making tin foil arc like a singing teslacoil.
Cell phones, themselves, really have only a single antenna element and considerably low power output. Around 200 mW is what most microwave transistors I see on the market are capable of pulling. The larger ones, for 2W, are usually intended for things like routers. However, it should be noted that most cell phone towers use planar arrays to refine and beam signals. In theory (not sure if implemented or practical in real world use), a tower could note the location of a phone and steer a beam of higher power toward it, to help boost signal range (as the station can use more powerful and higher quality amplifiers than the phone can). In practice, this is likely a more passive arrangement used to keep a beam contained to a certain region of coverage, as I doubt there are full banks of FPGAs working out how to steer signals to dozens to hundreds of different phones on the network (and with that many different 'targets' - there may be substantial loss of bandwidth to each one).