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clanon
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Everything posted by clanon
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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
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what standard (speed) and frequencies ?...2.4 5.8 A B G N ...AC 2.4ghz b/g/n High sensitivity (- 96 dbm at 1mbps) anything with AR9271 (Tplink tl-wn 722n Version 1) 150 mbps max
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VNA measurements
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FR4 have lots of disadvantages (efficiency at RX lost , losses at TX a lot ! , never know the Tangent loss and dielectric constant for each material , fr wouldn't be on POINT ever ) you'll need an antenna analyzer or vna to be on frequency PS: only "advantage" size is smaller than metal on air
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https://www.lan23.ru/forum/node/318855
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yeah , it's easy with the model....pretty sure you are gonna end close to 1 meter by 60 cm or more GRILL...
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Wire grill (big 80 cms at least) OR parabolic dish EVEN BIGGER 1.2 1.5 meters
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Easier ,for me, if YOU choose ANY 2-3 patches design (10dbi) ( need a frontal picture) and then we'll make it work at 725mhz...