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![]() "art" wrote in message ups.com... I recently gave a write up on Gaussian arrays As a sample which was not directed for any desirable I laid out the following All of the elements were placed above each other purely to make things easier to do plus it being an unusual arrangement probably never seen before. Coordinates ( perfect ground) Inches X Y Z 0 209.46 927.1 0 198.25 973.97 0 172.78 822.86 0 219.83 964.4 0 185.53 922.4 With 1" dia elements my results were Impedance 48.5 + j 0.1 Horiz gain 8.12 dbi @ 12 deg Rc gain 5.11 dbic Since I am not sure of the capabilities of EZNEC or other programs I also supply the following All elements driven impedances are 6.58 + j56.9 -5.28 - j 37.6 -5.00 -125 9.35 + 58.5 -16.2 - j205 as i pointed out before, and this verifies, you have found one of the limitations of finite element methods for modeling antennas. very close spacings between long elements causes un-realizable results. the extremely low real components of the impedance and high reactive values are symptoms of this. Now I need the help from anybody with a engineering degree which wipes out Richard since his only intent is to ridicule, or deceive anyway, to confirm the following For a Gaussian field the energy radiated by the array as a whole ( feed element 1 ) must equal the sum of the energy supplied from each individual element. this is true for any array. Questions. 1. Am I correct in saying this? 2. Does the above array rank in any way as a Gaussian array.? define 'gaussian array' as it applies to antennas that you are describing. that type of array is not defined in my copies of Jackson's or Ramo-Whinner-VanDuzer's books, nor does my IEEE antenna design handbook mention that term. there are references to 'gaussian beams' with respect to the shape of the fields from feed horns for microwave dishes and other quasi-optical systems. Some searching of the web also seems to refer to gaussian arrays, but those all seem to be related to current or power distribution on elements of an adaptive array. Frankly, one or more of you is an academic so I really am pointing at you for direction so I can be sure that my program has not somehow become corrupted I am sharing this with you so can you share your input with me? If you prefer to communicate by E mail with me that is fine since we know that the lips of some will spew Art |
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