06newexperiment6 TRANSLA - Experiment The Dipole in Free...

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FEU-Institute of Technology Experiment #6 page 1 of 25 ECE Department Dipole in Free Space, Effects of Surroundings and Dual Sources ECC221L meagrande The Dipole in Free Space, Effects of the Surroundings and Dual Sources I. Objectives a. Investigate the polar plots of a dipole in free space with both software simulation and hardware modelling. b. Compare the results of both methods. c. Investigate how the physical surroundings affect the signal strength of an antenna. d. Observe and analyze how a system of two dipoles performs in comparison with a single dipole. e. Investigate how the spacing, magnitude of the driven signal and the phase difference between the dipoles affects their performance. II. Equipment 1 Antenna Lab Generator 1 - Antenna Lab Receiver 1 USB Antenna Interface 1 - Antenna Accessories (2 dipoles with sources, 2 Yagi booms, ground plane, combiner, Yagi Stack base assembly) 1 PC with Discovery and NEC-Win Software III. Resume of Theory The Dipole Just about the simplest form of antenna is called a dipole . This is a conductor that is divided in the middle and is connected at this point to a feeder (or feed line). This feeder then connects the antenna to the receiver, or transmitter. Feeders come in many forms. Probably, the most commonly used is coaxial cable. This is the type of feeder used in this Trainer. More information on feeders can be found in Chapter 24 of the ARRL Antenna Book. Figure 1. A dipole and feeder Experiment 6
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FEU-Institute of Technology Experiment #6 page 2 of 25 ECE Department Dipole in Free Space, Effects of Surroundings and Dual Sources ECC221L meagrande In this experiment, you will investigate the dipole both by hardware modeling and by software simulation. IV. Procedure 1 Software Simulation 1. 1 Run NEC- Win and click ‘New File’ on the toolbar. You are going to enter details of a dipole that has the dimensions shown in Figure 2. Figure 2: Dimensions of the Dipole 1. 2 Setting up the Dipole Dimensions The table requires dimensions in all of the three directions. The ‘y’ direction, we will take as being along the direction of the wire of the dipole, the ‘x’ direction will be at right -angels to this, but on the same horizontal plane, and the ‘z’ direction at right angles in a vertical plane. Figure 3: The Three Axes We want the center of the dipole at the origin of the axes. This means that the two ends will be at +y and y, where y is half of the total length of the dipole. The dipole we want is to have a total length of 10 cm, i.e. ±5 cm.
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FEU-Institute of Technology Experiment #6 page 3 of 25 ECE Department Dipole in Free Space, Effects of Surroundings and Dual Sources ECC221L meagrande Firstly, enter the figure 0.05 (for 5 cm the dimensions are in meters) in the table under ‘Y1’ for Wire 1.
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