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clanon
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Everything posted by clanon
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It's for unbalanced LINES (COAX) NO need to use a balun... (PS: Since the antenna GEOMETRY is electrically "BALANCED")
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https://www.hindawi.com/journals/ijap/2015/164392/
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and it "gives" Covid 19...a think...
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S11 is the measurement of the antenna (or any electromagnetic black box) of ABSORPTION and RADIATION (efficiency) It shows how "deep" RESONANCE is at a given Frequency and hence BANDWIDTH (Q factor) PS: first 1 is the energy out and the second 1 is the ENERGY in OUTput / INput = Efficiency It should be equal or bigger than -20 db
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"Unfortunately, the use of low-cost FR4 as the substrate introduces some additional complexity on the antenna design. This is due to the inaccuracy of the FR4 relative permittivity and its high loss tangent (around 0.02). Variations in the FR4 electrical permittivity can shift the operating frequency and the high loss tangent dramatically affects the antenna axial ratio and gain, resulting in poor radiation efficiency." Design of Low-Cost Probe-Fed Microstrip Antennas | InTechOpen, Published on: 2011-04-04. Authors: D. C. Nascimento and J. C. da S. Lacava.
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this guy gives WORSE numbers...
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@5 ghz...anyway...it should be lower losses at 2,4ghz (couldn't find it...)
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Neltec about 90% attainable...(-0.9151db) apparently
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Not on DIELECTRIC...only on air ...i don't know about teflon...but for FR4 is 60 70 % efficiency...(-4.437 to -3.098)
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Downscaled to 2.4ghz Dimensions guessed... 1mm teflon sustrate seems to work...need more refinements...to get higher efficciency and lower VSWR...and z closer to 50 ohms...(maybe...) It should get closer or more than 20.5 dbi...(@ 3.5 ghz...)
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Haven't got "good" experiences with all parabolas y tried...(regular and offsets) Hard to point and adjust Feed... Wire (colineals) and Patch worked (better for me) If i need long range (more than 10km) i would go for the GRIDs (1m by 0.6) 24db or so...
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it needs a 1:1 BALUN...imho (that dipole) The whole Thread (old)
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PENCIL BEAM (hard to point it out)
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The more dielectrics the more LOSSes...(efficiency is 65 % 70 at the best cases...) illumination losses , spillover... These antennas...without VOLUME and Diameter...never pass the 17 18 dbi...and most are a BITCH to point out...(But good for a POINT to POINT)
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...only 14 dbi...(there are LOTS of plannars with that and more...(smaller , size and volume...) Nice dipole though...to use on a bigger DISH
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SHORTED...to gnd REFLECTOR
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TL -WN822N V1 AR9170 TL -WN822N V2 AR9287 (+ ar7010) TL -WN822N V3 RTL8192CU TL -WN822N V4 RTL8192EU TL -WN822N V5 RTL8192EU
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Textolite 0.5mm 4mm from reflector.... 16dbi_no24.rar
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You SHOULD start a NEW topic... LOVE HF , the ionosphere bouncing thing...Usually long WHIPS with correcting and load coils (maybe from front bumper side folded to cruise and free to rx or tx in a still)-slow position ...over here... but Long wire V and rhomboidals are best for RANGE PS: I could dig some ARRL info ...maybe (the older the better)
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offset or regular...? By the way has anybody tried to put two FEEDs at 90 degrees on a regular dish (parabolic) ? (MiMo)...?
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VERY INTERESTING info
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Clone of this...? https://www.wifi-antennas.com/topic/227-tenda-o3/