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【单选题】
Antenna gain is obtained by...? （）
A.
A power amplifier in the antenna system
B.
Concentration of radiation
C.
Highly effective antenna cables
D.
Good SWR (Standing Wave Ratio)
E.
A spherical radiation pattern
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【单选题】What is Omni-directional antenna?
A.
An antenna which is capable of line-of-sight communication with a satellite without requiring any pointing
B.
Generally it is used on an INMARSAT-M MES
C.
Generally it is used on an INMARSAT-F MES
D.
This is a kind of directional antenna
【单选题】What is omni-directional antenna?
A.
An antenna which is capable of line-of-sight communication with a satellite without requiring any pointing.
B.
Generally it is used on an Inmarsat-B MES.
C.
Generally it is used on an Inmarsat-F MES.
D.
This is a kind of directional antenna.
【单选题】A parabolic dish antenna is a(n) _________ antenna.
A.
unidirectional
B.
horn
C.
omnidirectional
D.
bidirectional
相关题目：
【单选题】What is Omni-directional antenna?
A.
An antenna which is capable of line-of-sight communication with a satellite without requiring any pointing
B.
Generally it is used on an INMARSAT-M MES
C.
Generally it is used on an INMARSAT-F MES
D.
This is a kind of directional antenna
【单选题】What is omni-directional antenna?
A.
An antenna which is capable of line-of-sight communication with a satellite without requiring any pointing.
B.
Generally it is used on an Inmarsat-B MES.
C.
Generally it is used on an Inmarsat-F MES.
D.
This is a kind of directional antenna.
【单选题】A parabolic dish antenna is a(n) _________ antenna.
A.
unidirectional
B.
horn
C.
omnidirectional
D.
bidirectional
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