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Radar System Engineering

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SEC,113] JVA VEGUIDE 399<br />

than a quarter wave and shunt the line with a rather low inductive<br />

impedance which would stop transmission.<br />

Sngle stub suPPort Multiple stubs -<br />

Shortened stubs for<br />

higher frequency<br />

FIG. 11 X.—Waveguide derived from stub-supported two-wire tranmnission line.<br />

El ‘ ‘“‘ “‘‘ ‘a)<br />

I 111 I I<br />

,<br />

(b)<br />

FIQ. l19.-Fundamentaln,odeo fwavepropagationi na rectangularguide; (a) and (b)<br />

show the electric field in a transverse and longitudinal cross section; (c) shows the lin& of<br />

current flow in the top and side of the waveguide as long dashes; the dotted lines represent<br />

tangential magnetic field at the wall.<br />

Figure 11.9 shows an instantaneous picture of the electric and magnetic<br />

fields in a rectangular waveguide whose wide dimension is slightly<br />

over half the free-space wavelength. The lines of current flow in the

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