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Found 9 results

  1. I have a simple two-element array, and I want to be able to quickly calculate far fields for arbitrary excitations. I've used Feko to generate two solutions, one for a symmetric excitation [a b] = [1 1], where a and b are the port voltages, and for an anti-symmetric excitation [1 -1]. I used these rather than [1 0] and [0 1] since Feko complains when a port excitation is zero. The ports are both 50 Ohms. Since Maxwell's equations are linear, superposition applies. My excitations are linearly independent, so I can combine them appropriately to generate an arbitrary excitation. Furthermore, I should be able to combine the radiated far fields in the same way. For example, if I choose [a b] = [1 exp(j*pi/4], I should get the same result whether I use superposition or calculate the fields directly with Feko. What I find, however, is a discrepancy in the results, and not a tiny one. Am I missing something?
  2. Hello every one i have created one microstrip patch antenna and its simulation was fine. after that I have try to generated a circular array, but this time i remove the substrate from the microstrip patch antenna. The idea is to make an array of microstrip patch antenna with shared dielectric. (8 mircostrip antenna + 1 single substrate) Problems: - whenever i wanted to make a single substrate after i made an array of microstrip patch antenna, the substrate will also becomes an array. So the number of substrate and microstrip antenna are the same Question: - how can we extend the dielectric so that all the antennas share the same dielectric in the same time use the array tools for the microstrip patch antenna your help and consideration are much appreciated. the FEKO models are in the attachment - i'm using feko version v2018.2.1 image1 & 2 - problem image 3 - how the end product should look like (without using copy and translate method) 26.04 - patch antenna 10GHz new dimension.cfx
  3. Hello iam looking for a code to put all names on page 1 to an Array. It should save Redundant values only once a time. Has anybody a idea how? best regards
  4. Hi all, how to understand the following error? set city(Guang zhou) "Guangdong" wrong # args: should be "set varName ?newValue?" set city(Guang\ zhou) "Guangdong" Guangdong Why space cannot exist in array element index? Roy
  5. I’m trying to model a two-element dipole array that can be steered in azimuth arbitrarily, and I want to compute realized gain. To do that, I run two FEKO simulations, one with in-phase excitations, [V1 V2] = [1 1], and one with 180-degree out-of-phase excitations, [V1 V2] = [1 -1]. From FEKO I export far fields and S-parameters, then process in Matlab. I’m assuming that the S-parameters that Feko calculates are active S-parameters since Feko computes only one value for each port. Is this a correct assumption? Assuming it is, I calculate the passive S-parameters from the four active S parameters (S1 and S2 for both [1 1] and [1 -1] excitations). I then use these to calculate active S-parameters for arbitrary element phase, and use the calculated active S-parameters to calculate the reflection loss needed to compute the realized gain for the array. Unfortunately, my calculated results don’t agree with those from Feko. That is, if I steer the beam 45 degrees in Feko and in my Matlab code, the active S-parameters don’t agree. Have I made an incorrect assumption about how Feko operates or is there a flaw in my logic?
  6. How do i store the materials on display in an array name (one variable that can store more than one value. Is it possible in tcl). And need to retrieve the information later (refer variable and retrieve only the first value).
  7. Hello, All: I built a REB2 in Hypermesh between two columns, and I need to build plenty of REB2 along the column height. As shown in the following figure, the green elements are REB2, I need to build REB2 at each node along the orange column (the space is the same along the column). So may I do something like array or copy for the REB2 I built in Hypermesh? Thank you very much for your help.
  8. Hello, I have written a TCL script that selects certain elements in my mesh. I want to have these elements put into a string array, so I can use this array to update a certain NASTRAN card, in comments, so I can use them later on in a different routine. The problem now, however, is whenever I try to use *createstringarray it gives back a 0 in the left corner. The string is in a variable that needs to be substituted into *createstring array: set elements {213 5342 53 213 642}; set $str [subst {\$BSURF 1 $elements}]; (Note that the BSURF is commented via $, hence the backslash) *createstringarray 3 "\$beginbsurfs" $str "\$endbsurfs" This following procedure returns a zero. What am I doing wrong? Thank you for your help and time! Jeffrey
  9. I want to simulate a Vivaldi array with 2 elements in receive mode. The only way to do this, as far as I can tell, is to use the receiving antenna far field request. However, in the user manual it states that no coupling is taken into account and that the antenna is seen as ideal with this request. This is unfortunate since I do want to take mutual coupling between the antennas into account - that is the main goal of this array simulation, to determine the coupling effects. Is there another way to simulate antennas in receive mode that takes coupling into account?
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