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clanon
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PORT ISN'T THERE , dangling (not touching metal on BOTH SIDES) or wrong port...CHECK WARNINGS
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Different SOLVERS give Different Center Frequency (Frequency vs Time Solvers)
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thinking about 15dbi or more by adding a reflector...Sectorial...
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could any of you post a stl stp file ? (cst2019)
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DIELECTRICS usually , radome adhesives...All add up in this case sustracts...
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10 db is when losses are at minimum for both Spillover and illumination...
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I think he means -6 db lobe pattern guarantees good efficiency for shallow dishes (with -4 loss at the border)
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The shape of the main LOBE IIRC at -6 db affects efficiency...
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https://ntrs.nasa.gov/api/citations/19670009367/downloads/19670009367.pdf
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narrow band apparently
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Looks like you have a resonance , DEEP, at 2.8... try making the whole Yagi 1.16 times bigger...
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FR4 version...not so good...High losses and some mismatch , lower gain... fr4.dxf
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Feed line on FR4 needs to be THINNER 5 mm or less...to get 50 ohms...
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1.5 mm distance between sides (Feed Line)