6. Conclusion

The main laws of network behavior can be summarized as follows.

• Near field :

  • below a certain frequency linked to the spacing between sources, the behavior is coherent and can be described analytically; it is characterized by cylindrical radiation ;

  • Above this frequency, the interference is such that the behavior is difficult to control.

• Far field :

  • changes in main lobe width and secondary lobe level are highly correlated in frequency;

  • modifying the source rate reduces the frequency dependence of the directivity function: frequency-independent directivity implies appropriate layout and...