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Lab Experiment 01

This document summarizes an introductory lab experiment on antenna design. The objectives are to become familiar with dipole antennas, investigate the properties of a dipole antenna in free space, and manually plot the radiation pattern. Students will examine radiation patterns of basic antennas through hands-on testing. Specifically, they will measure the radiation pattern of a dipole antenna by recording voltage readings from a transmitter-receiver pair across a range of angles and derive antenna properties like gain, polarization, front-to-back ratio, and beam width from the plotted results.

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412 views4 pages

Lab Experiment 01

This document summarizes an introductory lab experiment on antenna design. The objectives are to become familiar with dipole antennas, investigate the properties of a dipole antenna in free space, and manually plot the radiation pattern. Students will examine radiation patterns of basic antennas through hands-on testing. Specifically, they will measure the radiation pattern of a dipole antenna by recording voltage readings from a transmitter-receiver pair across a range of angles and derive antenna properties like gain, polarization, front-to-back ratio, and beam width from the plotted results.

Uploaded by

lovelyosmile253
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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International Islamic University, Islamabad

Antennas and Wave Propagation Lab

LAB EXPERIMENT # 1: Introduction to Antenna Design Lab


Group Members:
Name: . Registration#:. Name: . Registration#:. Name: . Registration#:. Name: . Registration#:. Section: .. Date of Experiment: .. Report submitted on: .

Marks obtained: Remarks: .. Instructors Signature: ......

Lab01: Introduction to Antenna Design Lab

Lab Experiment 1: Introduction to Antenna Design Lab


Objective:
To become familiar with dipole antennas. To investigate the properties a dipole antenna in free space To plot manually the radiation pattern of dipole antenna

Brief Theory:
The radiation pattern of the antenna is of principle concern when engineering a communications system. Lets assume that a signal needs to be sent from an antenna on the ground to a satellite in orbit. This would require a radiation pattern with the majority of its radiated power focused into orbit. If the antenna is not engineered to do so, contact cannot be established between the signal source and its target. There are many different ways to manipulate a radiation pattern to meet the demands of a specific task. These concepts are the principle focus of this lab assignment. Implementing this lab assignment, students will examine the radiation patterns of several antennas by hands on field testing. Only the most fundamental antennas were chosen for this lab assignment. This allows us to see visually how the most common types of real-world antenna designs function.

Types of Antenna: (Discuss different types of antennas) Dipole Antenna: (Discuss in detail) Radiation Pattern:
We use the following procedure for finding the radiation pattern of the antenna. 1. First place the transmitter antenna and receiver antenna facing each other at a distance of one meter. 2. Now fix the frequency of the transmitter to 750 MHz. 3. Find the value on the receiving end at the detector. 4. Note down the values with the difference of angle 30 degrees. 5. Note down the reading and find the dB of the values. 6. Find the front to back ratio: power at 0o (dB) - power at 180o (dB). 7. Plot the radiation pattern on the Polar Plot. 8. Calculate Gain of antenna: power at 0o (dB) - 1 (dB) 9. Then find the Half Power Beam Width using polar plot. 10. Find Polarization of antenna.

Antennas and Wave Propagation Lab (EE 449 L)

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Lab01: Introduction to Antenna Design Lab

Antenna Radiation Characteristics Table: (Radiation Pattern Observations) Angle (degrees)


0 30 60 90 120 150 180 210 240 270 300 330 360

Value (A)

dB value

Antenna Radiations Plot in Polar Plane: (Draw plot)

Antennas and Wave Propagation Lab (EE 449 L)

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Lab01: Introduction to Antenna Design Lab

Amplitude in dB vs Angle in degrees

Gain: Polarization: Front to Back Ratio: Half Power Beam Width:

Antennas and Wave Propagation Lab (EE 449 L)

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