It is claimed in blogs and other unverified internet sources that circular polarized RF signals are better for penetrating structures, such as walls.
An example here, there are many others when you search. All of them unverified, or not clearly explained.
More scientific information and papers tend to be about optics and polarization of light. While comparable to a certain extent, it does not explain the claims in regards to RF, both Amateur bands, such as 70/23cm nor consumer WiFi.
A few years ago, I took those claims and built myself some RHCP "clover" antennas and helix antennas for home WiFi distribution. Living in a period house, with 3 ft thick walls, my signal attenuation declined from room to room, and therefore WiFi reception improved throughout the property. Practically confirming the claims made.
Over the years I have built various circular polarized antennas and experimented on many different frequencies (70cm, 23cm, as well as consumer WiFi)
Throughout time, I have shared my practical solution with many, and others have reported back similar results. Again practically confirming the claims.
None of this without any real explanation why this is.
However a few days ago someone asked me... why ?
And other than explaining E-planes, random reflection of building materials with "unknown properties", and the "chance" that "some" signal is not reflected, I could not explain this phenomenon clearly.
Do circular polarized signals have better penetration properties compared to linear polarized signals?
and if so: why?