Question 1

The impedance at the center of the antenna is known as?
A)characteristic impedance
B)radiation resistance
C)transmission impedance
D)recovery resistance

Accepted Answer

The impedance at the center of an antenna, where it is typically fed, is known as the radiation resistance. This term describes the part of an antenna's impedance that is responsible for radiating electromagnetic energy.

Question 2

What happens when the radiation resistance of the antenna matches the characteristic impedance of the transmission line?
A)no transmission occurs
B)no reception occurs
C)swr is maximum
D)swr is minimum

Accepted Answer

When the radiation resistance of the antenna matches the characteristic impedance of the transmission line, the Standing Wave Ratio (SWR) is minimized. This condition ensures maximum power transfer from the transmission line to the antenna with minimal reflections, leading to efficient transmission and reception.

Question 3

The type of dipole antenna that has a higher band width is called as?
A)conical antenna
B)yagi antenna
C)helical antenna
D)marconi antenna

Accepted Answer

Conical antennas are known for their wide bandwidth capabilities due to their shape, which allows them to operate efficiently over a broad range of frequencies.

Question 4

The radiation pattern of a half-wave dipole has the shape of a __________
A)doughnut
B)sphere
C)hemisphere
D)circular

Accepted Answer

The radiation pattern of a half-wave dipole is doughnut-shaped, with the strongest radiation perpendicular to the axis of the antenna and nulls along the axis.

Quiz 2: Antenna and Transmission Line

The impedance at the center of the antenna is known as?

What happens when the radiation resistance of the antenna matches the characteristic impedance of the transmission line?

The type of dipole antenna that has a higher band width is called as?

The radiation pattern of a half-wave dipole has the shape of a __________