July 2002
Intermediate to advanced
344 pages
8h 37m
English
Content preview from Newnes Radio and RF Engineering Pocket Book, 3rd Edition
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• Type 7177
100 to 470 MHz
• Type 7277
225 to 400 MHz
• Type 7477
80 to 200 MHz
Polar diagram E plane
50
1
1.5
2
2.5
3
100 150 200 250 300 350 400 450 500
Frequency in megahertz
V
S
W
R
Key
7177
7277
7477
Figure 4.14 Discone wide band antenna (by kind permission of Jaybeam Ltd)
67
metallic roof, and as the area of the ground plane is reduced the
radiation pattern changes and more of the energy is radiated upwards
(not always a bad thing in inner city areas); also, the impedance rises.
The effect of the mounting position on the H plane radiation can be
dramatic, resulting in ragged radiation patterns and, in some directions,
negligible radiation. Advice on the installation ...
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