January 1997
Beginner
435 pages
18h 29m
English
Content preview from Microwave and Wireless Communications Technology
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180 MICROWAVE ANTENNAS
\ CAVt-i~y
I~1 ANTENNA ELEMENT X
\ I ~
i
D,sK :
I~1 I I !~
I~ \TUNING
SCREW
WAVEGUIDE OR
TRANSMISSION
LINE
Figure 9-6
Cavity antenna.
A form of antenna related to the horn is the cavity antenna of Fig. 9-6. In this type
of antenna, a quarter-wavelength radiating element extends from the waveguide
or transmission line connector into a resonant cavity. The radiator element is
placed one quarter-wavelength into a resonant cavity and is spaced a quarter-
wavelength from the rear wall of the cavity. A tuning disk is used to alter cavity di-
mensions to provide a limited tuning range
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