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How Antennas Work (Antenna functionallity (Antenna Polarization:…

- - - - Constructed of a piece of metal, wire, or similar
        conductive material
      - Does not amplify the signal in any way
      - Directional gain
        :warning: Passive antennas radiate the RF energy supplied by the
        transmitter in one direction
        :warning: Exhibits an effective gain that is similar to amplification
        of the signal
    - - Passive antennas with an amplifier built-in
      - Amplifier is connected directly to the piece of metal
        that forms the antenna itself
      - Most active antennas have only one electrical
        connection
        :black_flag: RF signal and the power for the amplifier are supplied
        on the same conductor
  - - - Used to transmit and receive signals from all
        directions with relatively equal intensity
      - Longer omnidirectional antennas usually have a
        higher gain
    - - Transmit a signal in one direction only
      - Yagi antenna emits a wider, less focused RF beam
      - Parabolic dish antenna emits a narrow, more
        concentrated beam of RF energy
    - - Emit an RF energy beam that is horizontally wide but
        vertically taller than that of a yagi antenna
      - Considered a semi-directional antenna
      - Often used to send RF energy down a long corridor
      - Some are designed for installation on building walls
        :red_cross: To send an RF signal in one direction away from the
        structure
      - One common application for patch antennas is in
        cellular telephony
- - - - Monopole antenna
        :checkered_flag: Straight piece of wire or metal, usually a quarter of the
        wavelength, with no reflecting or ground element
        :red_cross:A monopole antenna is less efficient than a dipole
      - Dipoles are commonly built as two monopoles
        :checkered_flag:Mounted together at the base
    - - Examples: patch and satellite dish antennas
      - Horn antenna
        :check:Resembles a large horn with wide end bent to one side
        :check:Common in telephone networks
        :check:Used to transmit microwave signals between two
        distant towers