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hi sos
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hi "jerry" i want QHA models and i try to adapt them for 2GHZ it's for heliosynchron satellite for earth sensing thank u Hi "disc" Wow, thats a small Quad Helix. Tell me the dimensions. I'll try to model it for you using EZNEC. Is this a real project? That is, do you have the antenna, or are you planning to build one? If you have a "store bought" 2 GHz Quad helix, there are certainly some patterns available from the mnanufacturer. If you plan to build the Quad helix, are you able to make any impedance measurements of the model? As you know, the fundamental plan in the Quad Helix design is to make one loop radiate 90 degrees later than the other due to the impedance difference between the two loops. Jerry KD6JDJ Remember that gigahertz-level quad helixes used on satellites are usually multiturn devices. Model results for a 137-MHz, half-turn antenna scaled up to 2 GHz may not be appropriate. .... Rich W2RG |
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