January 1997
Beginner
435 pages
18h 29m
English
Content preview from Microwave and Wireless Communications Technology
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96 WAVEGUIDES
INTRINSIC IMPEDANCE
OF
Fc "~ F
FREQUENCY
Figure 5-10 Impedance
versus frequency diagram.
wave enter the load, they cause currents to flow, which in turn causes heating.
Thus, the RF power dissipates in the sand-graphite rather than being reflected
back down the waveguide.
A second dummy load is shown in Fig. 5-11B. The resistor element is a car-
bonized rod critically placed at the center of the electric field. The E field causes
currents to flow, resulting in I2R losses that dissipate the power.
Two bulk loads, similar to the graphite-sand chamber, are shown in Figs. 5-
11C, D, and E. A bulk material ...
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