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6. Find the answers to the questions that follow.

1. What do antennas convert into electric current?

2. In what systems are antennas used?

3. How many fundamental types of antenna are there?

4. What is grounding structure of antenna?

5. How many variations of antennas are there? 6 Where is the horn used?

7. Where is the parabolic antenna used?

8. What is a bandwidth?

9. What does a Hertzian antenna require for its operation?

7. Consider the following statements whether they are true or false. Find the part of the text that gives the correct information.

1. The first rudimentary antennas were built in 1888 by Clerk Maxwell.

2. An antenna is an arrangement only of more conductors.

3. There are three fundamental types of antenna directional patterns.

4. The bandwidth of an antenna may be decreased by several techniques.

5. A simple straight wire antenna will have a different polarization when mounted vertically, and one polarization when mounted horizontally.

6. The parabolic antenna consists of a square conductor mounted over a groundplane.

7. The patch antenna consists of an active element at the focus of a parabolic reflector to reflect the waves into a plane wave.

8. The isotropic radiator is an antenna that radiates only in one direction.

9. The random wire antenna is simply a very long wire.

1

2

3

4

5

6

7

8

9

10

T

T

T

T

T

T

T

T

T

T

F

F

F

F

F

F

F

F

F

F

8. Complete the following sentences using the information from the text.

1. An antenna is a transducer that transmits or receives …

2. Antennas are used in systems such as …

3. Some of the first rudimentary antennas were built in 1888 …

4. Small antennas are usually preferred for …

5. The bandwidth of an antenna may be increased by …

6. The random wire antenna is simply a very long wire with …

7. The dipole antenna is simply two wires pointed in …

8. A loaded antenna is an active antenna having an elongated portion of …

9. Fill in the words from the list below. Use each word only once.

Antenna, transmitter, conductors, number, signals, channels, television, elements.

1. A television antenna is designed for the reception of over the air broadcast … signals.

2. The length of the …of a TV an antenna are usually half the wavelength of the signal they are intended to receive.

3. An antenna can have a smaller or larger … of directors.

4. Directional antenna must be pointed at the … they are receiving.

5. A single transmitter location may transmit signals for several….

6. The higher the … is placed, the better it will perform.

7. An antenna of higher gain will be able to receive weaker … from its preferred direction.

8. TV antennas are good … of electricity and attract lightning.