Antenna gain is obtained by...? （）A、A power amplifier in the antenna systemB、Concentration of radiationC、Highly effective antenna cablesD、Good SWR (Standing Wave Ratio)E、A spherical radiation pattern
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
相关考题：
在Atoll仿真过程中,网络基本数据的导入次序为()。 A.SiteS-TRANSmitteRS-ANteNNA-CellSB.SiteS-ANteNNA-TRANSmitteRS-CellSC.SiteS-CellS-TRANSmitteRS-ANteNNAD.SiteS-ANteNNA-CellS-TRANSmitteRS
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单选题Every lifeboat which is fitted with a fixed two-way vhf radiotelephone apparatus with（）which is separately mounted shall be provided with arrangements for sitting and securing the antenna effectively in its operating position.Aa dummy antennaBa supporting facilitiesCa back-up equipmentDan antenna
多选题多天线技术中，主要的增益包括：（）A分集增益（diverstiy gain）B阵列增益（array gain）C空间复用增益（spatial multiplex gain）D编码增益（coding gain））
单选题Every lifeboat which is fitted with a fixed two-way VHF radiotelephone apparatus with（）which is separately mounted shall be provided with arrangements for sitting and securing the antenna effectively in is operating position.Aa dummy antennaBa supporting facilitiesCa back-up equipmentDan antenna
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单选题Every lifeboat which is fitted with a fixed two-way（）radiotelephone apparatus with an antenna which is separately mounted shall be provided with arrangements for sitting and securing the antenna effectively in its operating position.AHFBVHFCMFDMF/HF
单选题Operational amplifiers, used primarily in analog circuits, are characterized by（）Ahigh input impedance, high gain and low output impedanceBhigh input impedance, high gain and high output impedanceClow input impedance, low gain and high output impedanceDlow input impedance, high gain and low output impedance
单选题In general, there are two parts in an SES, One of these is antenna eqipment also referred to as（）.ABDEBUDECAEPDADE