2). Which of the following Wi-Fi technologies employ radios that use Multiple-In

Question

2). Which of the following Wi-Fi technologies employ radios that use Multiple-Input, Multiple Output (MIMO)? Select all that apply. a). 802.11ac b). 802.11n c). 802.11g d). 802.11b e). 802.11a 3). Which of the following are the most effective element length for an antenna used with a 5 GHz transmitter (choose 2). Hint 1: Calculate the wavelength of this frequency first. Hint 2: Read the section discussing most effective length of an antenna element in the assigned reading. a). 30 mm b). 40 mm c). 70 mm d). 100 mm e). 120 mm 4). Although not always practical, antennas are most effective when the length of the antenna element is an even fraction (such as 1/4) or a multiple (such as 2X) of the wavelength. a). True b). False 5). An Azimuth chart shows the antenna radiation pattern on the horizontal plane (looking down on the radiation pattern). An Elevation chart shows a side view of the radiation pattern. a). True b). False 6). An access point has two or more antennas, with each having a receiver, and the receivers functioning together to minimize the negative effects of multipath. This can best be described as _____. a). Antenna diversity b). Antenna Polarization c). Fresnel Zoning d). Omnidirectionalization

Explanation / Answer

1)Which of the following Wi-Fi technologies employ radios that use Multiple-Input, Multiple Output (MIMO)? Select all that apply.

Ans) A & B

Both IEEE 802.11n (Wi-Fi), IEEE 802.11ac (Wi-Fi) are used as Wi-Fi technologies employ radios that use Multiple-Input, Multiple Output (MIMO).

2.Which of the following are the most effective element length for an antenna used with a 5 GHz transmitter.

Ans) A & B

for the given frequency of 5GHz 60 is the wavelength and
  
wavelength (in meters) = 300 / frequency (in MHz)

= 300/5
= 60 m
therefore most effective length of an antena using 5GHz is 30 mm or 40 mm

3 ans:) True

Yes Antennas are most effective when the length of the antenna element is an even fraction (such as 1/4) or a multiple (such as 2X) of the wavelength and also multiples of wavelenth ( ) .

4 ans:) True

An antenna radiation pattern on the horizontal plane looks side view of the radiation pattern this statement is True.

5 Ans:) Antenna diversity

An access point has two or more antennas, with each having a receiver, and the receivers functioning together to minimize the negative effects of multipath. This can best be described as Antenna diversity and by using Antenna diversity two or more antennas to improve the quality and reliability of a wireless link.

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Thank you hope the information helps you.

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