The far field is about 10 wavelengths or more from the antenna. The near field is close to the antenna, usually within several wavelengths (). The antenna is horizontally polarized if its horizontal to the earths surface. Support and regenerate one another along the way, but weaken over distance.Īn antenna produces both electric and magnetic fields that are perpendicular to one another, as well as to the direction of propagation.Īn antenna is vertically polarized if the electric field is vertical to the earths surface. These electromagnetic fields move at the speed of light (about 300 million meters per second or about 186,400 miles per second) through free space.Īccording to Maxwells well-known equations, they However, a brief review of the essentials can help allay any design worries.īoth oscillate at a specific frequency, and they travel together in a direction perpendicular to both fields ( Fig. They may look complex and enigmatic to most engineers, especially EEs working with wireless applications for the first timenot to mention that they come in a seemingly infinite variety of sizes and shapes. Theyre the transducers that convert the voltage from a transmitter into a radio signal.Īnd they pick radio signals out of the air and convert them into a voltage for recovery in a receiver. Parabolic Dish Antenna Design Software By injusdino1975 Follow | Public
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