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clanon
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FR4 EATS 5ghz energy PES and copper tape would be MORE EFFICIENT . ALL METAL even better
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coax specs might be off
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could you post a .stl (cst2019 here)
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different solver and different settings would give different F resonance . BUT dielectrics play the BIGGEST ROLE...try higher dielectric constant WHAT THICKNESSES ? METAL moves fr UP ussually is 0.035 mm copper 1.53mm FR4
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Only way I see to increase gain...is a reflector (Not omni anymore , but could add 3dbi) (multiplying elements cuts down on bandwidth and impedance changes)
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the slits slots must be for wideband impedance matching...for FR4...
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THIS dual band could be easier...FR4 moderate gain is for 2.4 and 5.2 but could be TWEAKED i think...
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USE POLYSTYRENE FOAM (STYROFOAM) Low density as a spacer ,is TRANSPARENT to RF and have NO LOSSES
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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)