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Lens Antenna

Lens Antenna is an antenna that consists of an electromagnetic lens with a feed. In other words, a lens antenna is a three-dimensional electromagnetic device whose refractive index is different from unity. It acts as a glass lens in optics.

Zener diode 

A normal p-n junction diode allows electric current only in forward biased condition. When forward biased voltage is applied to the p-n junction diode, it allows large amount of electric current and blocks only a small amount of electric current. Hence, a forward biased p-n junction diode offer only a small resistance to the electric current.