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Transmission Line Impedance Matching Quiz

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Transmission Line Impedance Matching Quiz

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Questions and Answers

What type of antennas are generally installed some distance above the ground and can radiate either vertically or horizontally?

Log-periodic antennas

Marconi (quarter-wave) antennas

Yagi-Uda antennas

Hertz (half-wave) antennas (correct)

What is the purpose of the coupling device in an antenna system?

To connect the antenna to the transmitter

To amplify the received radio signals

To match the characteristic impedance of the antenna with the transmission line (correct)

To convert electrical signals into electromagnetic waves

What does the Standing Wave Ratio (SWR) measure on a transmission line?

Signal strength of received radio waves

Perfection of the termination of the line (correct)

Impedance mismatch between the transmitter and receiver

Efficiency of power transfer along the transmission line

What is a disadvantage of vertically polarized waves when antennas are located near dense forests or among buildings?

Higher signal losses compared to horizontally polarized waves Signup and view all the answers

In the context of antennas, what does a half-wave dipole refer to?

An antenna with a length equal to half the wavelength measured in free space Signup and view all the answers

What characteristic of a real half-wave dipole leads to the efficient radiation of power into space?

Balanced feedline design Signup and view all the answers

What is the key difference between the END-FEED (VOLTAGE-FEED) method and the CENTER-FEED (CURRENT-FEED) method for feeding half-wave antennas?

The phase difference in the current at the feed point Signup and view all the answers

How does a folded dipole antenna compare to an ordinary dipole antenna in terms of frequency range?

It has a wider bandwidth Signup and view all the answers

What is a significant advantage of using a grounded quarter-wave antenna compared to an ungrounded half-wave antenna?

Reduced size Signup and view all the answers

When would a counterpoise be necessary in the construction of an antenna system?

When the earth is not a good conducting surface Signup and view all the answers