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4nec2 simulation 3

by: Thomas

4nec2 simulation 3 ECE 4370


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Antenna Engineering
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This 8 page Study Guide was uploaded by Thomas on Sunday May 1, 2016. The Study Guide belongs to ECE 4370 at Auburn University taught by in Spring 2016. Since its upload, it has received 27 views. For similar materials see Antenna Engineering in Electrical Engineering at Auburn University.

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Date Created: 05/01/16
Problem 1: Figure 1: the current real part of the center­driven dipole antenna Figure 2: the current imaginary part of the center­driven dipole antenna The input impedance is 85+j48.6. Figure 3: the current of the center­driven dipole antenna(3D Pattern) Figure 4: E­plane pattern plot Figure 5: H­plane pattern plot In the E­plane, the half power beam width  (HPBW)  is the angle between the half­power (­3 dB) points of  the main lobe. From the E­plane plot, we can see the direction of maximum radiation electric field intensity is  70.4V/m and the angle between electric field intensity 70.4*0.708=49.84V/m is the half power beam width ,  which is 129­51=78°. Problem 2: Figure 6: the real and imaginary parts of the input impedance from 100MHz to 1000MHz 500 points generate over this span of frequencies. From the plot, we can see when the point on the red line equal to 0, the input impedance becomes purely  real. It is at 285MHz, 542 MHz and 878 MHz. From the equation, antenna radiation efficiency e =R/(R+R),  Rr20πr(2h/r l r 2  λ ( ( and the R= 75Olm,  2h=0.5m, so we can know, we can get a highest efficiency when  λ is smallest, thus the best frequency is  100MHz.   Problem 3: Figure 7: the current real part of the both dipoles. Figure 8: the current imaginary part of the both dipoles. Figure 9: the 3D Pattern of the both dipoles antenna The input impedance is 96.9+j76.6. Figure 10: E­plane pattern plot Figure 11: H­plane pattern plot In the E­plane, we can get the HPBW similar to the problem 1, From the E­plane plot, we can see the  direction of maximum radiation electric field intensity is 104V/m and the angle between electric field intensity  104*0.708=73.63V/m is the half power beam width , which is 126­54=72°. And we could not get the HPBW from the H­plane pattern, HPBW can obtain from power pattern and E­ plane pattern. Problem 4: Figure 12: the plot of the input impedance vs d / λ (λ=1m) Figure 13: the plot of the input impedance vs d / λ (λ=1m, d from 2.2m to 3m) From the question 1, we know the input impedance is 85+j48.6. The minimum distance should be  2.322m, the input impedance almost returns to the value obtained in problem 1. From figure 13, we can  the plot is almost flat. Problem 5: When f = 900MHz, so λ=1/3m. Figure 14: the plot of the input impedance vs d / λ (λ=1/3m) The answer is quite different, the plot of input impedance vs d / λ is flat and almost no change. From the  plot of problem 3 and 4, we can conclude that when the frequency is larger, the value of input impedance  fluctuate smaller. Problem 6: Figure 15: the current real part of the both dipoles. Figure 16: the current imaginary part of the both dipoles. The input impedance is 85+j48.6. Figure 17: the 3D Pattern of the both dipoles antenna Figure 18: the E­plane pattern   Figure 19: the H­plane pattern In the E­plane, the half power beam width  (HPBW)  is the angle between the half­power (­3 dB) points of  the main lobe. From the E­plane plot, we can see the direction of maximum radiation electric field intensity is  70.4V/m and the angle between electric field intensity 70.4*0.708=49.84V/m is the half power beam width ,  which is 129­51=78°. And we could not get the HPBW from the H­plane pattern, HPBW can obtain from power pattern and E­ plane pattern. The coupling between the center­driven dipole and the rod for this case, based on 4NEC2 results, we can  conclude that when the center­driven dipole perpendicular to the rod, the rod is not affect the center­ driven dipole . Firstly, using a software simulation tool like 4Nec2 is easy to build the antennas, it can simulate similar to the real data, we can build an antenna model many times in order to obtain a model we really need and to  save money and time without wasting. Secondly, using a software simulation tool can easily obtain a  whole data, which we could analysis the model in different ways, for example, using geometry 2D plot,  3D pattern, frequency sweep, etc.  And the advantage of building, testing, and measuring real antennas in the lab is real data, we can directly analysis what wrong in our model, and though the process of building antennas in the lab, we can easily  and deeply understand the theory of the antennas. In one word, both of the two approaches have advantages, which can make up for each other.


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