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clanon
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Everything posted by clanon
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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)
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https://www.scielo.br/j/jmoea/a/5RBXvnGygJNrS8LCHSCdFLJ/
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https://youtu.be/iOmdQnIlnRo?t=924 ,,,why it doesn't work..??
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They are Circular polarized disc patchs Right hand and Left Hand without the CUTS it would go linear... and are switched electronically from RHCP to LHCP and EACH disc could be fed (slot feeding) the phase of signal you program (delays) to make an Electronically Scanned Array (no need to point to Each satellite , the electronics do that) AND there is BEAM FORMING too...
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IIRC the WIRES UNDER the discs (closer to reflector) gave less reactivity ...improving VSWR...
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you gonna need tubing (aluminum old TV antennas) 10 mm or more...MOST Array aren't omni , metasurfaces are a LIE...VERTICAL FRANKLIN Collineal is the way...BUT MOST I see are folded dipoles with facing on the coax...SO a SIMULATION is NEEDED for ONE DIPOLE and then multiply by at least 6-8 or 10 units and facing COAX should be calculated...for 340 MHZ and 50 mhz bandwith...
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12 dbi omni is doable...what wideband arround 340 mhz...? (Narrow = Wire , Wide = Tube) but you gonna end up close to 5 meters having 44 cm each dipole... a big Tower...for omni...
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OMNIdirectional and high gain are MUTUALLY EXCLUSIVE can not have BOTH...at 340 mhz omni Vertical colineal VEEERY LOOONG could get you 15 dbi...using several meters of wire...
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it would be GREAT to put a VNA there on ALL 5 and check HOW they behave ...tho