Question 1

What can be done when the signal from an isotropic radiator needs to reach a specific receiver without increasing the IR power which may interfere with other antennas in different locations?&#10;A) use passive gain to focus the signal&#10;B) increase the IR power to the antenna&#10;C) use active gain&#10;D) radiate the signal in all directions

Accepted Answer

To avoid interference with other antennas, the best option is to use passive gain to focus the signal towards the specific receiver without increasing the IR power. This can be achieved through techniques such as directional antennas, reflectors, or lenses, which allow the signal to be concentrated in a specific direction without increasing its power. Using active gain or radiating the signal in all directions would increase the risk of interference with other antennas.

Question 2

Low-gain antennas have a shorter range than high-gain antennas but do not have to be precisely aimed.

Accepted Answer

Low-gain antennas have a wider radiation pattern, which means they send and receive signals in many directions. Therefore, they do not need to be aimed precisely like high-gain antennas, but they have a shorter range.

Question 3

In what units is passive gain measured?&#10;A) effective isotropically radiated power&#10;B) intentionally radiated power&#10;C) decibels dipole&#10;D) decibels isotropic

Accepted Answer

Passive gain is measured in decibels isotropic (dBi), which is a unit of measure for antenna gain compared to isotropic radiation.

Question 4

The FCC places no limits on the amount of power that can be generated by an IR.

Accepted Answer

The FCC does place limits on the power that can be generated by an IR. This is to prevent interference with other communication systems and to ensure public safety.

Question 5

Which antenna type can be used for short to medium range outdoor applications and focuses the energy in one direction?&#10;A) omnidirectional&#10;B) unidirectional&#10;C) semidirectional&#10;D) highly-directional

Accepted Answer

Semidirectional antennas focus energy in a specific direction, which is suitable for short to medium range outdoor applications, allowing for more targeted coverage compared to omnidirectional antennas.

Question 6

____ antennas are used for long distance,point-to-point wireless links,such as connecting buildings that are up to 42 kilometers (25 miles)apart.&#10;A) Fresnel&#10;B) Omni-directional&#10;C) Semi-directional&#10;D) Highly-directional

Accepted Answer

Highly-directional antennas are preferred for long distance, point-to-point wireless links as they provide a narrow beamwidth and high gain, which allows for a longer range and better signal strength. These antennas are commonly used for connecting buildings or communication towers that are several kilometers apart.

Question 7

Which type of antenna is used for long-distance point-to-point wireless links?&#10;A) omnidirectional&#10;B) unidirectional&#10;C) semidirectional&#10;D) highly-directional

Accepted Answer

Highly-directional antennas such as parabolic dish antennas, Yagi antennas, and horn antennas are the best choice for long-distance point-to-point wireless links as they offer high gain and narrow beamwidth, allowing for a focused, strong signal over long distances. Omnidirectional antennas have lower gain and greater interference from other nearby wireless devices, while semidirectional and unidirectional antennas may offer better gain than omnidirectional antennas but not as much as highly-directional antennas, making them less ideal for long-distance point-to-point links.

Question 8

Which is a type of amplifier that can be used to boost an RF signal?&#10;A) bidirectional amplifier&#10;B) omnidirectional amplifier&#10;C) semi-directional amplifier&#10;D) quasi-directional amplifier

Accepted Answer

A bidirectional amplifier is designed to boost RF signals in both directions, making it the best choice for amplifying signals in two-way communication systems. Omnidirectional, semi-directional, and quasi-directional amplifiers are not specifically designed for boosting RF signals and may not be as effective in this application.

Question 9

What is the term given to the difference between the received signal level and the signal level required by the radio to assure there are no errors?&#10;A) free space path loss&#10;B) system operating margin&#10;C) voltage standing wave ration&#10;D) link budget

Accepted Answer

The term given to the difference between the received signal level and the signal level required by the radio to assure there are no errors is known as system operating margin. Option A (free space path loss) refers to the reduction in power density (attenuation) of an electromagnetic wave as it propagates through space. Option C (voltage standing wave ratio) is a measure of impedance matching in transmission lines. Option D (link budget) is used to calculate and analyze the total gain and loss of a communication system to ensure the signal can be successfully transmitted and received without errors. While link budget includes system operating margin, it also includes other factors such as antenna gain and path loss.

Question 10

Highly-directional antennas are generally concave dish-shaped devices.

Accepted Answer

Highly-directional antennas are commonly known as dish or parabolic antennas, which are concave-shaped devices that are designed to focus radio signals in a particular direction.

Question 11

Which technique can increase performance by sending independent streams of information at the same time over the same frequencies?&#10;A) spatial diversity&#10;B) MIMO diversity&#10;C) transmit beam forming&#10;D) spatial multiplexing

Accepted Answer

The answer of Which technique can increase performance by sending...

Question 12

Which technique uses a process in which the sending device codes or assigns weights to the signals before sending them which results in improved reliability?&#10;A) spatial diversity&#10;B) maixmal ratio combining&#10;C) transmit beam forming&#10;D) spatial multiplexing

Accepted Answer

The answer of Which technique uses a process in which...

Question 13

Antennas play a vital role in receiving signals,but no role in transmitting.

Accepted Answer

The answer of Antennas play a vital role in receiving...

Question 14

Which measurement indicates how narrow or wide a transmission is?&#10;A) Fresnel zone&#10;B) Azimuth&#10;C) beamwidth&#10;D) elevation chart

Accepted Answer

The answer of Which measurement indicates how narrow or wide...

Question 15

The strength of a signal from an omnidirectional antenna flows out 90 degrees from the antenna's orientation.

Accepted Answer

The answer of The strength of a signal from an...

Question 16

The technique for combating multipath by using multiple transmit and receive antennas is sometimes called which of the following?&#10;A) MIMO diversity&#10;B) spatial singularity&#10;C) transmit beam forming&#10;D) nulling

Accepted Answer

The answer of The technique for combating multipath by using...

Question 17

What is an Azimuth chart used to represent?&#10;A) the elevation coverage&#10;B) the horizontal coverage area&#10;C) the vertical coverage area&#10;D) the total IR power

Accepted Answer

The answer of What is an Azimuth chart used to...

Question 18

A ____ dipole antenna produces a flatter signal than a standard dipole antenna.&#10;A) Fresnel&#10;B) high-gain&#10;C) zoned&#10;D) semi-directional

Accepted Answer

The answer of A ____ dipole antenna produces a flatter...

Question 19

What device might you use to decrease an RF signal to fully comply with FCC regulations regarding power output of a WLAN?&#10;A) variable-loss amplifier&#10;B) fixed-loss attenuator&#10;C) variable-loss attenuator&#10;D) fixed-loss amplifier

Accepted Answer

The answer of What device might you use to decrease...

Question 20

Which of the following is true about antennas?&#10;A) they are active and generate the power they use to transmit&#10;B) they are passive conductors&#10;C) they have a single connection point which is to the ground plane&#10;D) IR is the power emanating from an antenna

Accepted Answer

The answer of Which of the following is true about...

Question 21

What does an Azimuth chart represent?

Accepted Answer

The answer of What does an Azimuth chart represent?...

Question 22

Define the Fresnel zone.

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The answer of Define the Fresnel zone....

Question 23

Contrast an omnidirectional antenna with a semidirectional antenna.

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The answer of Contrast an omnidirectional antenna with a semidirectional...

Question 24

What are highly-directional antennas typically used for?

Accepted Answer

The answer of What are highly-directional antennas typically used for?...

Question 25

_______________ antennas have a shorter range but do not have to be precisely aimed at the receiver.

Accepted Answer

The answer of _______________ antennas have a shorter range but...

Question 26

What does an antenna's beamwidth indicate?

Accepted Answer

The answer of What does an antenna's beamwidth indicate?...

Question 27

An RF signal ____________ has one input and two or more outputs,which divides the power of the input signal to multiple outputs.

Accepted Answer

The answer of An RF signal ____________ has one input...

Question 28

Which of the following are measurements used with antennas? (Choose all that apply.)&#10;A) intentional radiator&#10;B) decibels isotropic&#10;C) decibels/mW&#10;D) decibles per second

Accepted Answer

The answer of Which of the following are measurements used...

Question 29

Which of the following are among the basic categories of antenna? (Choose all that apply.)&#10;A) semidirectional&#10;B) unidirectional&#10;C) omnidirectional&#10;D) highly-directional

Accepted Answer

The answer of Which of the following are among the...

Question 30

What term is used to describe an electrical entity that hinders the flow of current and is often a result of a mismatch between two devices?&#10;A) fade margin&#10;B) sensitivity&#10;C) negative gain&#10;D) impedance

Accepted Answer

The answer of What term is used to describe an...

Question 31

Which of the following are signaling processing techniques used by MIMO to create high throughput? (Choose all that apply.)&#10;A) spatial singularity&#10;B) maximal ratio combining&#10;C) transmit beam forming&#10;D) spatial multiplexing

Accepted Answer

The answer of Which of the following are signaling processing...

Question 32

A _____________ is a material that allows an electrical current to flow through it.

Accepted Answer

The answer of A _____________ is a material that allows...

Question 33

Briefly define antenna.

Accepted Answer

The answer of Briefly define antenna....

Question 34

List the four singaling processing techniques employe by MIMO to achieve high throughput.

Accepted Answer

The answer of List the four singaling processing techniques employe...

Question 35

Something that has absolute uniformity in all its characteristics in all directions is called _____________.

Accepted Answer

The answer of Something that has absolute uniformity in all...

Question 36

If an antenna has a ____________ gain in one direction,it must have a decrease in the other directions.

Accepted Answer

The answer of If an antenna has a ____________ gain...

Question 37

What is the most common type of antenna for a WLAN?

Accepted Answer

The answer of What is the most common type of...

Question 38

Explain polarization.

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The answer of Explain polarization....

Question 39

Which of the following are steps for mitigating obstructions in the Fresnel zone? (Choose all that apply.)&#10;A) lower the tower height&#10;B) reduce obstructions such as trees&#10;C) raise the antenna mounting point&#10;D) use a MIMO antenna

Accepted Answer

The answer of Which of the following are steps for...

Question 40

Describe the optimal location for APs using omnidirectional antennas in a WLAN.

Accepted Answer

The answer of Describe the optimal location for APs using...

Question 41

Match between columns&#10;                        Premises: information that is computed by the receiver and sent back to the transmitter for use in the antenna configuration&#10;information that is computed by the receiver and sent back to the transmitter for use in the antenna configuration&#10;information that is computed by the receiver and sent back to the transmitter for use in the antenna configuration&#10;information that is computed by the receiver and sent back to the transmitter for use in the antenna configuration&#10;information that is computed by the receiver and sent back to the transmitter for use in the antenna configuration&#10;information that is computed by the receiver and sent back to the transmitter for use in the antenna configuration&#10;information that is computed by the receiver and sent back to the transmitter for use in the antenna configuration&#10;information that is computed by the receiver and sent back to the transmitter for use in the antenna configuration&#10;information that is computed by the receiver and sent back to the transmitter for use in the antenna configuration&#10;information that is computed by the receiver and sent back to the transmitter for use in the antenna configuration&#10;a stick of metal inserted in the earth to ground the antenna&#10;a stick of metal inserted in the earth to ground the antenna&#10;a stick of metal inserted in the earth to ground the antenna&#10;a stick of metal inserted in the earth to ground the antenna&#10;a stick of metal inserted in the earth to ground the antenna&#10;a stick of metal inserted in the earth to ground the antenna&#10;a stick of metal inserted in the earth to ground the antenna&#10;a stick of metal inserted in the earth to ground the antenna&#10;a stick of metal inserted in the earth to ground the antenna&#10;a stick of metal inserted in the earth to ground the antenna&#10;a technique that sends a normal version of the signal along with a shifted version of the same signal&#10;a technique that sends a normal version of the signal along with a shifted version of the same signal&#10;a technique that sends a normal version of the signal along with a shifted version of the same signal&#10;a technique that sends a normal version of the signal along with a shifted version of the same signal&#10;a technique that sends a normal version of the signal along with a shifted version of the same signal&#10;a technique that sends a normal version of the signal along with a shifted version of the same signal&#10;a technique that sends a normal version of the signal along with a shifted version of the same signal&#10;a technique that sends a normal version of the signal along with a shifted version of the same signal&#10;a technique that sends a normal version of the signal along with a shifted version of the same signal&#10;a technique that sends a normal version of the signal along with a shifted version of the same signal&#10;mutiple antennas that can be customized to send an optimal signal&#10;mutiple antennas that can be customized to send an optimal signal&#10;mutiple antennas that can be customized to send an optimal signal&#10;mutiple antennas that can be customized to send an optimal signal&#10;mutiple antennas that can be customized to send an optimal signal&#10;mutiple antennas that can be customized to send an optimal signal&#10;mutiple antennas that can be customized to send an optimal signal&#10;mutiple antennas that can be customized to send an optimal signal&#10;mutiple antennas that can be customized to send an optimal signal&#10;mutiple antennas that can be customized to send an optimal signal&#10;an antenna that divides the coverage area into different parts and gives each part its own antenna&#10;an antenna that divides the coverage area into different parts and gives each part its own antenna&#10;an antenna that divides the coverage area into different parts and gives each part its own antenna&#10;an antenna that divides the coverage area into different parts and gives each part its own antenna&#10;an antenna that divides the coverage area into different parts and gives each part its own antenna&#10;an antenna that divides the coverage area into different parts and gives each part its own antenna&#10;an antenna that divides the coverage area into different parts and gives each part its own antenna&#10;an antenna that divides the coverage area into different parts and gives each part its own antenna&#10;an antenna that divides the coverage area into different parts and gives each part its own antenna&#10;an antenna that divides the coverage area into different parts and gives each part its own antenna&#10;additional power is sent to the antenna from the power source&#10;additional power is sent to the antenna from the power source&#10;additional power is sent to the antenna from the power source&#10;additional power is sent to the antenna from the power source&#10;additional power is sent to the antenna from the power source&#10;additional power is sent to the antenna from the power source&#10;additional power is sent to the antenna from the power source&#10;additional power is sent to the antenna from the power source&#10;additional power is sent to the antenna from the power source&#10;additional power is sent to the antenna from the power source&#10;the VSWR as measured in dB&#10;the VSWR as measured in dB&#10;the VSWR as measured in dB&#10;the VSWR as measured in dB&#10;the VSWR as measured in dB&#10;the VSWR as measured in dB&#10;the VSWR as measured in dB&#10;the VSWR as measured in dB&#10;the VSWR as measured in dB&#10;the VSWR as measured in dB&#10;the ability of an access point to transmit on the antenna that most recently received the strongest incoming signal&#10;the ability of an access point to transmit on the antenna that most recently received the strongest incoming signal&#10;the ability of an access point to transmit on the antenna that most recently received the strongest incoming signal&#10;the ability of an access point to transmit on the antenna that most recently received the strongest incoming signal&#10;the ability of an access point to transmit on the antenna that most recently received the strongest incoming signal&#10;the ability of an access point to transmit on the antenna that most recently received the strongest incoming signal&#10;the ability of an access point to transmit on the antenna that most recently received the strongest incoming signal&#10;the ability of an access point to transmit on the antenna that most recently received the strongest incoming signal&#10;the ability of an access point to transmit on the antenna that most recently received the strongest incoming signal&#10;the ability of an access point to transmit on the antenna that most recently received the strongest incoming signal&#10;the orientation of of radio waves as they leave an antenna&#10;the orientation of of radio waves as they leave an antenna&#10;the orientation of of radio waves as they leave an antenna&#10;the orientation of of radio waves as they leave an antenna&#10;the orientation of of radio waves as they leave an antenna&#10;the orientation of of radio waves as they leave an antenna&#10;the orientation of of radio waves as they leave an antenna&#10;the orientation of of radio waves as they leave an antenna&#10;the orientation of of radio waves as they leave an antenna&#10;the orientation of of radio waves as they leave an antenna&#10;an antenna consisting of a single stretched wire with connection in the middle&#10;an antenna consisting of a single stretched wire with connection in the middle&#10;an antenna consisting of a single stretched wire with connection in the middle&#10;an antenna consisting of a single stretched wire with connection in the middle&#10;an antenna consisting of a single stretched wire with connection in the middle&#10;an antenna consisting of a single stretched wire with connection in the middle&#10;an antenna consisting of a single stretched wire with connection in the middle&#10;an antenna consisting of a single stretched wire with connection in the middle&#10;an antenna consisting of a single stretched wire with connection in the middle&#10;an antenna consisting of a single stretched wire with connection in the middle

Accepted Answer

The Answer of implicit feedback and antenna array and dipole is...

Deck 4: Antennas