NETW310 Module 5 PPT - v2 (1)

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DeVry University, Keller Graduate School of Management *

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310

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Electrical Engineering

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Feb 20, 2024

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pptx

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NETW310 Course Project Module 5 Antenna Gain and Free Space Path Loss

Rubric Activity Requirement(s) Points Antenna Gain Answer five questions 22 Free Space Path Loss Answer nine questions 38

1. What is the maximum theoretical antenna gain of a common dish antenna at the 2.4 GHz band? [4 points] Answer: The maximum theoretical gain of the dish antenna is 22.379 dBi. 2. What is the maximum theoretical antenna gain of a common dish antenna at the 5 GHz band? [4 points] Answer: The maximum theoretical gain of the dish antenna is 29.079 dBi 3. Given the same sized reflector, which signals, high-frequency, or low-frequency, can be more efficiently focused by a common dish antenna (i.e., result in a higher antenna gain)? [ 5 points ] Answer: 5 GHz band is more efficiently focused 4. What is the maximum theoretical antenna gain of the dish antenna used in the VLA radio telescopes in New Mexico at the 5 GHz band? [4 points] Answer: The maximum theoretical gain of the dish antenna used in the VLA radio telescopes is 63.059 dBi 5. Given the same signal frequency, which dish antennas, large-sized or small-sized, are more efficient at focusing the signal (i.e., result in a higher antenna gain)? [ 5 points ] Answer: Large-sized dish antennas are more efficient at focusing the signal and result in a higher antenna gain. Antenna Gain

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1. What is the free space path loss in dB at the 2.4 GHz band? [4 points] Answer: The loss is about -61.37 dB 2. What is the free space path loss in dB at the 5 GHz band? [4 points] Answer: The loss is about -41.53 dB 3. How does the free space path loss at a higher frequency (e.g., the 5 GHz band) compare with that at a lower frequency (e.g., the 2.4 GHz band)? [ 5 points ] Answer: The high frequency has a higher free space path loss compared to the lower frequency due to 2 main factors, attenuation and diffraction. Higher frequency = shorter wave lengths and so they are more easily absorbed by obstacles such as buildings or trees leading to higher attenuation and less ability for diffraction. However lower frequencies isn’t like that. The free space path loss at a higher frequency is generally greater than that of a lower frequency. 4. What is the free space path loss in dB over 20 meters at the 2.4 GHz band? [4 points] Answer: the loss is about 46.6 dB for over 20 meters at the 2.4 GHz. 5. What is the free space path loss in dB over 40 meters at the 2.4 GHz band? [4 points] Answer: The loss is about 52.6 dB for over 40 meters at the 2.4 GHz. 6. What is the free space path loss in dB over 80 meters at the 2.4 GHz band? [4 points] Answer: The loss is about 34 dB for over 80 meters at the 2.4 GHz. 7. When the distance doubles, how does free space path loss in dB change approximately? [ 5 points ] Answer: The free space path loss in dB increases by about 6 dB. This is because free space path loss follows an inverse square law. Free Space Path Loss

8. Use a scientific calculator to calculate Delta for D1 = 20 meters and D2 = 40 meters. [4 points] Delta = -0.0408 9. Is your calculation approximately the same as the result from Part 1 Step 2? [4 points] Answer: no Free Space Path Loss Cont.