V

Using kjo as a separation constant, separate Equation (4.21) into two differential equations as follows:

Rearrange terms and obtain:

which is the zero-order Bessel equation, and:

The solution of the Bessel equation (4.24) for outgoing waves is given by the zero-order Hankel function of the first kind:

For k0r ^ 1 (far-field approximation):

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