January 1997
Beginner
435 pages
18h 29m
English
Content preview from Microwave and Wireless Communications Technology
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Key Equations 195
5. Antenna directivity as a function of power densities:
D
~ Pmax
6. Antenna directivity referenced to isotropic:
4/1:
D= o
7. Direcfivity gain of an antenna:
Gd = 4~Pa
P,
8. Power gain of an antenna:
Gp = 47rP,,
P.
and
Pai
Gp= Pi
9. Relationship between directivity gain and power gain:
Up --
Pr Gd
P~
10. Relationship between transmit gain and receive aperture:
G __
4rrAe n
Z2
11. Gain of a horn radiator:
10A
G=
Z2
12. The-3-dB beamwidth of a horn antenna:
51~
Vertical" ~v = b
degrees
70~,
Horizontal"
Oh = degrees
a
196 MICROWAVE ANTENNAS
13. Cutoff frequency of waveguide feeding dish antenna:
fcutoff ...
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