January 1997
Beginner
435 pages
18h 29m
English
Content preview from Microwave and Wireless Communications Technology
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190 MICROWAVE ANTENNAS
G
REFLECTOR
HELICA~RADIATOR
FEED ~ D
,,,
D = X-. G_>0.8X p= X__
3 4
CONDUCTOR DIAMETER" -~,
0.017X
GAIN PROPORTIONAL TO NUMBER OF TURNS
Figure
9-17
Helical antenna.
The helical antenna is a circularly polarized antenna used primarily in the
low end of the microwave region. The design of the antenna (Fig. 9-17) consists of
a helical coil of N turns situated in front of a reflector plane (G). The helical antenna
is broadband compared with the other types, but only at the expense of some gain.
The direction of the helix spiral determines whether the polarity is clockwise or
counterclockwise circular. Key design ...
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