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clanon
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Everything posted by clanon
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a Mesh wire REFLECTOR would give at least 3 dbi more...and tailor the impedance...down to 75 ohms...MAYBE...
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Already did , didn't like the changes...tried 2 versions , 2021-2022...went BACK...
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Check efficiency , usually is poor for FR4...(it hurt RX) , if you are close to 90% it's good enough...imho
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I can't open your cst (i'm using 2020)...
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same size or smaller and close by...TRY SLOTS on the patchs , that works too
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S11 (Return loss) is the energy absorbed or rejected and it relates to VSWR...from -10 to -20 you have under 2 VSWR, a GOOD antenna...and it should go from the lower frequency you need to the highest (bandwidth)
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Adding parasitic patches (close by) would make a new s11 dip (higher or lower than the original) if those TWO dips are close by you'll widen the bandwidth ...(at some s11 expense , s11 goes up , less energy absorbed ) if you stay under -10 and efficiency is good...you are good to go...PS: efficiency is ALWAYS GOOD for me , cause i use STYROFOAM as dielectric...
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ALL metal is WAY BETTER (no losses or dielectric shifts) , with 4 patches at 3.5 you'll end up close to 15 dbi (if EVERYTHING is ok) band width might end up to narrow...tho
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3.5 ghz (from 3.4 to 3.6 ghz bandwidth) mimo (more than 20db isolation between ports) at least 12-15 dbi gain...imho (gonna have to put the modem with the antenna close by...short cables...) Opening and soldering NEW cables (low losses) would be better...
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on this ALL METAL structures (if no mistakes have been made) results should be close to simulations(5% 7%) BUT if DIELECTRICS have been used...THINGS GO HAYWIRE FAST and BAD...in MY experience (change in dielectric constant from 1.1 to 1.075 HUGE dimensions and results difference at 2.4 ghz and PATCH ARRAY)
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How does the FEED point looks...? it should be be wider band...
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That's the COMPLICATED EXPENSIVE approach...BUT it achieves MODULAR SHIELDING of different sections (LNA , RECEIVERS , Local OSCILLATORS , Power supplies , Filters , Switches etc)
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Yup , EMI shield (Faraday CAGE) aluminum (copper or brass is better) container without interruptions (heat dissipation should be considered) and GROUNDED to GND
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It's known as a BAZOOKA balun
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Open side pointing up (the direction of the Energy you DON'T want coming through the Shield of Coaxial) imho The confussion comes from the rubber duckie pointing DOWN (open end) cause it is ACTING as a Quarter wave and ground plane to obtain a HALF WAVE dipole...
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ENA-2135-RGB X band.pdf
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https://web.archive.org/web/20070827000210/http://www.xaviervl.com/Antenne/Colinear/index.html
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XLS Excel dimensions for wifi colineaire.xls
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https://web.archive.org/web/20050121044720/http://reseaucitoyen.be:80/index.php?ColineairePourLesNuls
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that error is related to SOLVER choice and MESH size...(either reduce mesh size or try TLM solver Time domain)
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5ghz band at 5 km gonna need some REAL EFFORT (Sector antennas and Power-sensitivity on AP)