Antenna Theory and Communication System (ELEC 20009) – Spring – 20 – CW2 (Assignment 2) – QP
MEC_AMO_TEM_034_01 Page 1 of 6
Instructions to Student
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Answer all FIVE questions. Deadline of submission: 07/07/2020 at 23:59 The marks received on the assignment will be scaled down to the actual weightage of the assignment which is 50 marks Formative feedback on the complete assignment draft will be provided no longer than 27/06/2020 Feedback after final evaluation will be provided by 21/07/2020 |
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Module Learning Outcomes
The following LOs are achieved by the student by completing the assignment successfully
1. Critically evaluate antennas parameters used in communication links; and
2. Explain the propagation effects on radio wave propagation.
Assignment Questions
| 1. | ||
| a. | As communication engineer you have been requested to design radio communication system using parabolic antenna of 120 cm diameter operates on 1800 MHz frequency with input power of 1 KW, radiated power of 62-W and radiation resistance is 18.75Ω. Obtain: i. Efficiency of the antenna; ii. Gain of the antenna; iii. The Loss resistance RL ; iv. Suggest ways to increase the gain at the same operating frequency. |
(3 Marks) (5 Marks) (3 Marks) (4 Marks) |
| b. | An isotropic antenna is radiating in free space. Consider a far field distance of 250 m from the antenna where the total Magnetic field Intensity H is 30 mA/m. Calculate the power radiated. |
(5 Marks) |
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| IN SEMESTER INDIVIDUAL ASSIGNMENT | |
| Module Code: ELEC 20009 | Module Name: Antenna Theory and Communication System |
| Level: 2 | Max. Marks: 100 |
Antenna Theory and Communication System (ELEC 20009) – Spring – 20 – CW2 (Assignment 2) – QP
MEC_AMO_TEM_034_01 Page 2 of 6
| 2. | ||
| a. | A Wi-Fi access point radiates a signal using dipole antenna at frequency of 2.4 GHz with the current (IRMS) of 8 A. It is given in the antenna manual specification that the antenna Gain G=16.98 dB and Directivity D=17.78 dB. Assume that the loss resistance is 10 Ω. For the same antenna determine the following: i. Radiation resistance; ii. Radiated power; iii. Total input Power fed to the antenna |
(4 Marks) (3 Marks) (3Marks) |
| b. | For an antenna the radiation resistance and loss resistance are 72 ohms and 1.5 ohms respectively. The radiation intensity of antenna is given by |
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