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clanon
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Everything posted by clanon
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Nope it's a 2,4ghz...https://openwrt.org/inbox/toh/totolink_n300rt
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Losses on FR4 at 5.8...? Efficiency...? dunno
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9,5 DBI average from 1.7 to 2,6...
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is it possible , Jomy ,...that it has TWO resonances ?...and that they are at 1.8 and 2.4 ghz...does it makes sense...?
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How close am i...? don't know much about LTE range... but i really like the SMOOTHNESS of this one...
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You're RIGHT , my bad...Theoretically YAGIs only need 1 DIRECTOR or 1 REFLECTOR to be IT!... (PS:Just Semantics i guess)
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https://drive.google.com/file/d/1YUtCtA57I8AyKA4WGt4QRwAIShzAoUJn/view
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0.78 mm teflon (NELTEC) 2mm from ground plane to Feed points (Tracks are closer to reflector) Cavities are 5mm deep...or so...
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You could use HINGES for the sides , and fold'em BACK for transport...(Or make it for fast assemble and dis-assemble...)
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...and then...: it becomes a ...YAGI ! (a DISCs yagi)
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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...)