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n 5 2

n 5 3n

5 4

19.8 Bessel’s equation and Bessel functions 593

J n (x)

1

n 5 0

n 5 1

0

2 4 6 8 10 12 x

–0.4

Figure19.18

BesselfunctionsJ n (x),forn = 0 . . .4.

Engineeringapplication19.12

Modesofacylindricalmicrowavecavity

Circularcross-sectionwaveguidesandcylindricalmicrowavecavitiesarebothcomponents

that are found in high power microwave systems such as radar transmitters.

Bessel functions are used in the mathematical description of electromagnetic wave

behaviour in such devices. By way of example, consider the microwave cavity depictedinFigure

19.19.

r

l

Figure19.19

Acylindrical microwave cavity.

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