Question

Which of the following is incorrect regarding the communication system,

• A. Antenna (radio), also known as an aerial, a transducer designed to transmit or receive electromagnetic (e.g., TV or radio) waves..
• B. Modulation circuit designs may be classified as low- or high-level (depending on whether they modulate in a low-power domainfollowed by amplification for transmissionor in the high-power domain of the transmitted signal)
• C. The amount of signal received from a distant transmission source is essentially geometric in nature due to the inverse-square law, and this leads to the concept of effective area.
• D. The polarization of an antenna refers to the orientation of the electric field (E-plane) of the radio wave with respect to the Earth's surface and cannot be determined by the physical structure of the antenna and by its orientation

Answer 1

The correct option is D The polarization of an antenna refers to the orientation of the electric field (E-plane) of the radio wave with respect to the Earth's surface and cannot be determined by the physical structure of the antenna and by its orientation

An antenna is a transducer that converts radio frequency elect current to electromagnetic waves that are then radiated into space . The electric field or 'E' plane determines the polarization or orientation of the Radio wave . In general most antennas radiate either linear or circular polarization .

An antenna is said to be vertically polarized (linear ) when its electric field is perpendicular to the Earth;'s surface.

Horizontally polarized (linear) antennas have their electric field parallel to the earth's surface.