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C4 : HOW ANTENNA WORKS (:fire: Antenna Performance :zap: (Antenna System…

- - - - :pencil2:constructed of a piece of metal, wire, or similar conductive material
      - :pencil2: does not amplify the signal in any way
      - :pencil2: directional gain
        
        Wide beam
        
        Narrow beam
    - - :fountain_pen: amplifier is connected directly to the piece of metal that forms the antenna itself
      - :fountain_pen: most active antennas have only 1 electrical connection --- RF signal & the power for the amplifier are supplied on the same conductor
      - :fountain_pen: passive antennas + amplifier built-in
  - - - :check: Directly proportional to the wavelength of the carrier
      - :check: Inversely proportional to the frequency of the carrier
    - - :black_circle: Omnidirectional antennas : used to transmit & receive signals from all directions with relatively equal intensity || longer omnidirectional antennas usually have a higher gain
      - :black_circle: Directional antennas
      - :black_circle: Patch antennas
- - - - :white_flag: RF waves tend to spread away from the source of the signal(the antenna)
      - :white_flag: Free space loss calculator tools can be found on Internet
- - - - :star: quarter-wave
      - :star: half-wave
      - :star: eighth-wave antennas
- - - - 1) A switched bean antenna
      - 2) Adaptive of phased array antennas