The word 'antenna' is fromGuglielmo Marconi's test with wireless equipment in 1895. For the test, he used a 2.5 meter long pole antenna with a tent pole called 'l'antenna centrale ' in Italian. So his antenna was simply called 'l'antenna '. After that, the word 'antenna' became popular among people and had the meaning it has today. The plural of antenna is eitherantennas orantennae (U.S. and Canada tends to useantennas more than other places).[2]
Each one is made to work for a specificfrequency range. The antenna's length or size usually depends on thewavelength (1/frequency) it uses.[3]
Different kinds of antenna have different purposes. For example, theisotropic radiator is an imaginary antenna that sends signals equally in all directions. Thedipole antenna is simply two wires with one end of each wire connected to the radio and the other end standing free in space. It sends or receives signals in all directions except where the wires are pointing. Some antennas are more directional.Horn is used where high gain is needed, the wavelength is short.Satellite television andradio telescopes mostly usedish antennas.
