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  Radiation from Linear Antenna Introduction A linear antenna is used in electromagnetic wave communication. It consists of a straight conducting wire through which alternating current flows. The oscillating charges in the antenna produce changing electric and magnetic fields that propagate away from the antenna as electromagnetic (EM) waves. The study of radiation from a linear antenna forms the foundation of antenna engineering. It helps us understand how radio transmitters, television broadcasting, satellite communication, radar, and wireless systems work. A short linear antenna is also called a Hertzian dipole or elementary dipole because its length is much smaller than the wavelength.   What is Radiation from a Linear Antenna? Definition Radiation from a linear antenna is the process by which electrical energy supplied to the antenna is converted into electromagnetic waves and transmitted through free space. The alternating current in the antenna cr...

  Dielectrics – Polarization: Complete Guide with Types, Derivations, Formulas and Applications Introduction A dielectric is an insulating material that does not allow the free flow of electric current but responds strongly when placed in an electric field. Unlike conductors, where free electrons move freely, the charges inside dielectric materials are bound to atoms or molecules. When an electric field is applied, these bound charges undergo a slight displacement, resulting in electric polarization. Polarization is important concepts in electro magnetics because it explains how dielectric materials store electrical energy, increase capacitor capacitance, and influence electric field distribution. Common dielectric materials include: Air Glass Plastic Rubber Ceramic Paper Mica Quartz Teflon Transformer oil Dielectrics are widely used in capacitors, transmission lines, microwave devices, electrical insulation, and electronic circuits. What is Polariza...