We will reproduce the formula established by Liu of the TM_{m} _{n} _{p} mode [LIU 83]:

[A2.1]

The notation conventions are recalled below:

[A2.2]

[A2.3]

We find in [A2.1] the impedance of the *Z _{w}* plane wave and the surface resistance of the walls of the

[A2.4]

*a*, *b* and *d* are the dimensions of the cavity.

We will not recall the whole development of the Liu calculation, which is reproduced in detail in [LIU 83]. This appendix will limit itself to the framework of the calculation.

The computation is established for an over sized cavity, in the bandwidth occupied by a mode interfering with other modes, whose population will only increase with the frequency of the RF emission. According to the description proposed in section 2.3.2, we consider that the Δ *f _{m n p}* bandwidth belongs with the mode tuned on the

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