Antenna Theory

An antenna (or aerial) is an electrical device which converts electric power into radio waves, and vice versa. It is usually used with a radio transmitter or radio receiver. In transmission, a radio transmitter supplies an electric current oscillating at radio frequency (i.e. a high frequency alternating current (AC)) to the antenna's terminals, and the antenna radiates the energy from the current as electromagnetic waves (radio waves). In reception, an antenna intercepts some of the power of an electromagnetic wave in order to produce a tiny voltage at its terminals, that is applied to a receiver to be amplified.  Antennas are essential components of all equipment that uses radio. They are used in systems such as radio broadcasting, broadcast television, two-way radio, communications receivers, radar, cell phones, and satellite communications, as well as other devices such as garage door openers, wireless microphones, Bluetooth-enabled devices, wireless computer networks, baby monitors, and RFID tags on merchandise.

Antenna - Basic Concept

What is an Antenna

Propagation

Directivity

Bandwidth

Antenna Gain

Horn Antenna

Principle of Yagi antenna

Directional Antennas

What is a loading coil? - Helical antenna

Demo of microstrip patch antenna

Microstrip antenna - overview

Microstrip antenna - feeding methods

Microstrip antenna - circular polarization

Microstrip antenna - arrays

Microstrip antenna - radiation concept

Microstrip antenna - radiation pattern

VSWR

How line loss influences antenna VSWR measurements

What is Path Loss??

What is a dB, dBm, dBu, dBc, etc. on a Spectrum Analyzer??

Antenna Radiation Pattern using NA - Part 1

Antenna Radiation Pattern using NA - Part 2

Antenna Beamwidth measurement using NA -  Part 1

Antenna Beamwidth measurement using NA -  Part 2