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Circuit-slide-28

# Circuit-slide-28 - Simple array of two antennas Consider...

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Simple array of two antennas Consider two identical parallel Hertzian dipoles separated by a distance d

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The dipole currents have the same amplitude and total phase difference α The electric far field components at the observation point are
At long distance , we have and the field components can be written as

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After applying the approximations, the two components can be combined to give the total electric field The final result is
The resultant radiation pattern of the electric field is proportional to The unit pattern is proportional to the radiation pattern of the individual antennas, assumed to be identical. The group pattern is proportional to the radiation pattern the array would have with isotropic antennas . Note: on the x y plane, ψ coincides with the azimuthal angle ϕ . Following are examples of two antenna arrays with specific values of dipole distance and current phase difference .

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CASE STUDY - 1) A radio broadcast transmitter is located 12 km West of the city it needs to serve. The FCC standard is to have 25
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Circuit-slide-28 - Simple array of two antennas Consider...

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