# Method of calculating the transmission matrix (Tvv, Tvh, Thv, Thh)

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Hello everyone

I had some trouble understanding the transmission matrix that ProMan generates. However I found some explanation on this forum which helped me a lot.

There is still something i do not understand about this. This other post said the matrix was made independent of the antenne's polarization. But then what does ProMan use to generate these values, how are they calculated? Do they take into account the material properties (for example when there is a reflection)?

Thanks in advance for any help!

Kind regards

Publi

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Hello,

the transmission matrix considers both polarization states (V and H) for the computations, which means it is independent of the assignment done at the transmitter in your project as both cases (V and H pol) will be computed in any case and provided in the corresponding results.

For the interactions (reflections, transmissions, diffractions) the defined material properties are considered.

Best regards

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Hello Reinerh

Thanks for your response! I understand that the material properties are considered for all interactions, and so the values of the transmission matrix are influenced by the material properties. But i'm having trouble to see how the values in the transmission matrix are generated, how they are calculated?

For example for the direct ray the material properties do not matter, how is the transmission matrix generated in that case? And what if there is a reflection?

I'm sorry if i'm missing something here.

Kind regards

Publi

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Hello,

In case of the direct ray (where the material properties do not matter) also the four different cases Tvv, Tvh, Thv, Thh are analyzed.

So what happens in case of Tx antenna with v-pol and Rx antenna with v-pol, and so on for the other cases.

As for the direct ray no interactions (like e.g. reflections) are included just the direct ray is analyzed and then Tvv as well as Thh describe the corresponding complex transmission factor in linear scale (depending on the distance) while Tvh as well as Thv are almost zero due to the polarisation mismatch.

The first letter stands for the Tx polarization and the second letter for the Rx polarization, so Tvh is for vertically polarized transmission with horizontally polarized reception and Thv evaluates the case for Tx H pol with Rx V pol.

The individual transmission matrix components (linear factors) indicate how of the radiated signal is received by the receiver (including the Tx and Rx polarizations).

Best regards

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