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clanon
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Everything posted by clanon
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LTE Band 40 uses the 2300 MHz to 2400 MHz frequency range (FIRST the FREQUENCY then the BUILD around SUCH frequency) you seem to be getting NO SIGNAL 2 db is nothing
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BRASS is great...Copper would be BETTER...(signal is LOST on small little defects on the way from Wireless card trough the antenna final contact point) CONTACT should be FIXED no play...
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make sure there's GOOD electric contact between inner wire and Excited Disc (that White looks like polyester resin or some dielectric paint)
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Been beating around the bush for years to find a Good 4x4 patch array... Higher than 21 dbi , good impedance through the whole band,low enough vswr, under -20dbi side lobes... the original design is for 12,5 ghz and almost none side-lobes Power distribution Ratio 1:5:5:1 Changed it to WiFi , distribution ratio 1:1:1:1 (Original design Eliminated Sidelobes at the COST of 1,5-2dbi of gain) I'm happy (some testing still needed ) REAL dielectric constant of Polystyrene foam is a guess (1.02-1.05)
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@yurik82 is it a BALUN...? looks like it..
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is a link to your OWN site...
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maybe something like this
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I was hoping YOU have the drawings...i never draw any of those antennas...Is on the Petras and others a 3 strip balun from reflector to antenna...
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Jomy , These BALUN details might be IMPORTANT to know (3-4 feeding STRIPS) do you have a drawing with Dimensions...(Russians use it all the time)
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A very well KNOWN DUAL band antenna 8dbi @2.4ghz 10dbi @5ghz You tube internals (Andrew)
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is built for bandwidth (i think)...discs won't get the same bandwidth...
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good luck with THAT (Yagis hit a wall around 16dbi) more than 20 is a LOOOONG YAGI...and 200mhz bandwidth conflicts with gain...(A different antenna or a PARABOLIC DISH would get the gain , not the bandwidth)
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Balanced vs Unbalanced
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Dimensions are related to Lambda , it might be Full wave to work...like a Quad... did you try an Array...?
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ALL BALANCED LOADS (electrically symmetric) Antennas , require a BALANCED Feed...since the use of a BALUN (which adds problems in itself , bandwidth is reduced , etc) Balanced load balanced feeding (Twin Lead or BALUN) UN Balanced Load UN Balanced feeding (COAX straight in)
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Try this : Luneburg lens the Dielectric Constants should be changing from low outside to hugest in the core (twisting the Beam towards the center) https://www.analogictips.com/wp-content/uploads/2023/08/WTWH_Luneburg_lens_Pt3_Fig4.png also flat disc https://www.sciencedirect.com/science/article/pii/S2211379724000329
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lo mas fácil es tener un cable (corto) de 50 ohms desde la antenna hacia la wlan y el conector hembra a rosca sin soldar dentro del PCB Easiest way is a coax from antenna (SHORTEST POSSIBLE) towards the usb wlan card and the SMA female attached to the card (and avoid soldering inside the card) incluso el conector roscado al reflector Disc seria lo mas corto y fuerte (el ultimo disco y mayor diámetro puede estar directo al exterior del coaxial)
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Most people use it like this picture (the aux antenna could give problems) La mayoría de la gent lo usa de esta manera...la segunda antenna interfiere y no ayuda en nada...
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i left it long ago...something is really OFF TWO different antennas (2.4 and 5.8 apparently) glued together and tryn to be fed at the same time...(i'll take a look again when I CAN) FEED NETWORK is MISSING...IMPROVISED and STUCK there THERE ARE easier and better collineal sector arrays..
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Directors EXACT size might matter and distances between them...Should look like this...
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Proximity feed (quarter wave Lambda) Widens the bandwidth impedance...a little I didn't like mine , if YOU want to tweak it , WORK over the feed tab size and distance to optimize the impedance bandwidth
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A little more bandwidth with the Proximity FEED TAB (instead of direct contact)But yagi bandwith is real limited...an NEW whole band Bow tie LPDA would have better bandwidth...
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Company published VSWR
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I'm goin to replace the squares with bowtie triangles to check if it gets better... do you have the N type connector posted somewhere...?
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Jomy ,could you post the aproxímate dimensions...I wanna try and make it wider bandwidth)