Q₁: Answer the following sentences with (True) or (False) then correct the false sentences: 1- When the HPBW increase, the directivity of the antenna increases. 2- The side lobes do not appear in a loop antenna. 3- In array antennas, when the phase excitation equal 0, the end-fire radiation does not exist. 4- The polarization loss factor of a mismatch antenna is PLF-1. 5- The azimuth plane of a directional antenna is a circle. 6- When C=7/0.1 the Loop antennas are considering an electrically small loop antenna. 7- The axil ratio of the circular polarized antenna is AR-1. 8- The current distribution of the small dipole antenna is the triangular variation. 9- The Return Loss (RL) of -10 dB means no reflection from the antenna. 10-The radiation resistance of the 2.5 dipole antenna is greater than 22 dipole antenna.

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A: Correct option is c.

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A:

Antenna Characteristics

The antenna is an important concept in the domain of electronics and communication engineering. An antenna forms an integral part of many commonly used devices such as wireless modems, routers, game controllers, mobile phones, bluetooth devices, and so on. In simple terms, any wireless communication makes use of antennas to serve the purpose. An antenna, also known by the term 'arial', is an electrical device that converts electrical signals into electromagnetic waves or electromagnetic waves into electrical signals. An antenna contains a transmission line usually made up of co-axial cable, it then receives the signals and converts them into electromagnetic waves, which are then transmitted via space into their required destination. A communication system essentially makes use of two antennas, a transmission antenna, which converts electrical signals into electromagnetic waves, and a receiving antenna, which receives the electromagnetic waves and converts them back into electrical signals.