Exam 4: How Antennas Work

A transmitter generates a 15 dBm signal and is connected to an antenna using a cable that induces a 3 dB loss. The cable has two connectors that induce a loss of 2 dB each. What is the signal level at the input of the antenna?

To work as efficiently as a dipole, a monopole antenna requires a(n) _______.

A lower frequency signal uses a ________ antenna, whereas a higher frequency signal uses a _______ antenna.

One of the purposes of a(n) ________ is to emit an electromagnetic signal into air or space.

How do sky waves propagate? Sky waves bounce between the ionosphere and the surface of the earth.

When planning a wireless link, you should always prepare a ______ to ensure that the signal that reaches the receiver meets the minimum signal strength requirements.

Decibel is a relative measurement that requires a(n) _________.

For the best performance between transmitter and receiver, the two antennas should have the same ________.

Passive antennas can be designed in a way that effectively increases the strength of a signal in a particular direction.

In a direct, point-to-point link, the Fresnel zone should never be obstructed more than _______.

The ________ of an antenna depends upon the frequency of the RF signal and the gain.

Between the transmitting antenna and the receiving antenna, a signal will always be subject to _________.

A gain of 6 dB means that the signal level or strength _________.

What happens if someone sets up a pair of antennas that interfere with your point-to-point link between two buildings that uses an unlicensed frequency? You will have to resolve the issue yourself by raising or lowering the height of your antennas, because the regulatory agencies will not assist you.

List two types of directional antennas. Dish, Yagi

How do smart antennas function? They track the location of the mobile receiver and send a narrower beam to prevent wasting energy.

A directional antenna typically has a low gain.

The simplest and most practical type of antenna is a _______ antenna.

The gain of an antenna is the measure of how ______ the direction of an antenna pattern is.

A(n) _________antenna transmits a signal in all directions with relatively equal intensity.