[alancalverd]

What's the quantum explanation for my experiments with microwave, such as longitudinal propagation in meander sheet, conjoined twin polarizers, and polarization splitter?

These are cases where the wave model of electromagnetic radiation works really well, and the photon model isn't helpful.

A model is not an explanation. It's a mathematical approximation to observation.

[hamdani yusuf (OP)]

Photons have a property called polarisation.

How does the polarization behave?
What determines it when the photon is created?
How can it be changed?

[hamdani yusuf (OP)]

What's the quantum explanation for my experiments with microwave, such as longitudinal propagation in meander sheet, conjoined twin polarizers, and polarization splitter?

These are cases where the wave model of electromagnetic radiation works really well, and the photon model isn't helpful.

A model is not an explanation. It's a mathematical approximation to observation.

Not all waves have the same behavior.  Only in conductors electromagnetic waves can propagate longitudinally.
 

[Bored chemist]

How does the polarization behave?

Just the way you showed it did in your experiments.

[hamdani yusuf (OP)]

How does the polarization behave?

Just the way you showed it did in your experiments.

List of random facts doesn't represent scientific knowledge. It should contain general rules governing behaviors of objects in various but related situations. Comprehension is a data compression process.   

I designed the filters in my experiments with microwave based on antenna theory as shown in the old training videos by Royal Canadian Air Force.