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clanon
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Everything posted by clanon
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A very well KNOWN DUAL band antenna 8dbi @2.4ghz 10dbi @5ghz You tube internals (Andrew)
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probably for high band...(only directors) lower band MUST BE Tubes both crossed and combined on one output is 33 cm by 1,34 meters
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Been beating around the bush for years to find a Good 4x4 patch array... Higher than 21 dbi , good impedance through the whole band,low enough vswr, under -20dbi side lobes... the original design is for 12,5 ghz and almost none side-lobes Power distribution Ratio 1:5:5:1 Changed it to WiFi , distribution ratio 1:1:1:1 (Original design Eliminated Sidelobes at the COST of 1,5-2dbi of gain) I'm happy (some testing still needed ) REAL dielectric constant of Polystyrene foam is a guess (1.02-1.05)
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http://wifipanelantenna.blogspot.com/2008/12/panel-wifi-antenna.html 1800.cst
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MikroTik QRT 5 is a dual-polarization 5 GHz microstrip panel antenna with a gain specified up to 24 dBi and integrated radio at just 31×32×5 cm size The plastic case looks quite robust and UV resistant. The microstrip antenna array inside consists of 64 elements (8×8), which result in 10.5° beamwidth (-3 dB). There is also a MikroTik RB911G-5HPnD-QRT board, which features a 2×2 MIMO 802.11an radio (AR9342 SoC) with 30 dBm tx power. The antenna is connected with two short MMCX pigtails.
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Still testing , Imepdance needs some work still...But looks good so far) Copper tape under 40 cm long and wide...PES foam or PU foam dielectric
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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)
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The shape of the main LOBE IIRC at -6 db affects efficiency...
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Trying to make a "GOOD" Lpda , SCIFI VIVALDIs from RFSPACE have NO GAIN (under 1GHZ) , Chinese LPDAs have LOTS of LOSSES and mismatch...50 ohms FLAT ALL band , just a peak close to 1ghz unavoidable on this antennas...
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