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Bidisha Barman

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    Computational Electromagnetics
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  1. So, will this MLFMM solver work if I take a bigger array (in that way, I am increasing the dimension to several wavelengths in both directions)? I have already simulated a 10x10 array using the standard MoM solver. So, I want to see the efficiency of other solvers now. What other solvers can I use to obtain the array radiation pattern?
  2. Thank you Mel. I tried using finite ground plane. This time I took a 4 element linear array. But I am still getting some error message. I have attached the .cfx file here. Can you please go through this and suggest the corrections to my model? 3by3ArrayOfAntenna1.cfx
  3. Hello, I have modeled a 10x10 array of microstrip patch antennas. I want to use the MLFMM solver to check the radiation pattern of this array. In order to do that, I first selected the "Solve Model with multilevel fast multipole method (MLFMM)" option under the MLFMM/ACA tab of the Solver Setting. This resulted in error 37356, which says that DGFM and MLFMM cannot be used together. Therefore, I disabled the DGFM solver and then checked the MLFMM solver only. Now I am getting error 2580, which says that "No special Green's function may be activated with the MLFMM". Where am I going wrong? Please let me know the correct way to use this solver. Thanks in advance.
  4. Hello, I am simulating a linear array of 25 dipoles with all the elements placed along the X-axis and oriented along the Z-axis. I did a Far Field Request such that theta varies from -90 deg to +90 deg and phi=0 deg. In POSTFEKO I can see that the directivity vs. theta plot is exactly same as the gain vs. theta plot. Why is this so?
  5. Hello, I have modeled a linear array of dipoles along the X-axis (all dipoles being oriented along the Z-axis). All dipoles have been excited uniformly using voltage sources. According to the theory, the main beam can be steered if a progressive phase shift could be applied to the input. So, to achieve a 30 degree beam scan, I have assigned the phase (in the phase column of the voltage source dialogue box) to be 0, 30, 60, 90, ..., 720 starting from the first to the 25th dipole element. For this configuration it is expected to get the main beam at 120 deg, but I could get the main beam at 99.5 deg (I have attached the FEKO file here). What am I doing wrong? How can I get the desired scanning? Please suggest. Thank you in advance. uniform25.cfx
  6. Hi, I am trying to reproduce the results from the paper "The Active Element Pattern", by D. M. Pozar (attached below). In the paper, the author has considered an infinite array of planar dipole antennas and have obtained the active element pattern of a particular element. The active element gain pattern of the m-th element of the array is obtained by exciting only the m-th element and terminating all other elements in matched loads. According to the paper, if the element is excited with a voltage Vn=Voexp(-j k n a sin (theta)), where theta is the scanning angle, then there should be some dip or null observed in the active element gain pattern (at a certain scanning angle). I have simulated an array of 25 simple dipoles in FEKO where the dipoles are placed along the X-axis on the X-Y plane with each dipole oriented along the Z-axis. I have excited only the 5th element with a voltage source (Magnitude (V) = 1 and Phase (degree) = 30) and have added loads (of 50 ohm) to the other elements. When I am observing the gain pattern in POSTFEKO it is not showing any dip or null. Why is it so? How can I get the results shown in the paper? Please suggest. 00310010.pdf
  7. Thank you Torben. It is working.
  8. Thank you very much Mel. I have tried this and I can see the gain pattern of a particular element in an array when all the other elements are terminated with matched loads (say 50 ohm). But is it possible to obtain the active element gain pattern (i.e., the gain pattern of a particular element when all the other elements in the array are excited)?
  9. I have simulated a linear array in FEKO and have observed the total radiated E-field pattern in POSTFEKO. I wanted to know how can I obtain (and hence extract) the gain pattern of individual elements in a linear array antenna? Please suggest.
  10. Thanks Johan. The exported file has an extension .z*p. How can I read these values?
  11. I have simulated an array of dipoles antennas in FEKO. How is it possible to extract the impedance matrix of this array antenna? Please advise.
  12. I have actually found the solution to it. After importing the data file to MATLAB we need to write the command: polarpattern(Phideg,FarField1dBV). This is giving me the same results.
  13. I have simulated an array of dipole antennas in FEKO and extracted the polar plot data of the far field radiation pattern in the form of a .dat file. However, when I am plotting the same graph using MATLAB using the extracted data, I am getting a completely different result. I am attaching the images of the plots obtained using FEKO and MATLAB and also the data file extracted from FEKO. How can the polar plots be obtained using MATLAB? Please suggest. P.S. I have used the following MATLAB command after importing the .dat files (containing data from the FEKO polar plot for radiation pattern): polar(Phideg,FarField) pattern.dat
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