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clanon
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Posts posted by clanon
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What DIELECTRIC...?
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9 minutes ago, papagayor said:Thank you my friend, I'm new on CST design but trying to learn by seeking online for help, also continue to design different models and simulate them for knowledge. I liked the Kathrein antenna design that is simple and very stable and trying to make a prototype at 3.5GHz center frequency and a bandwidth of 3.3-3.8 because that is the working 5G area in Greece
...find one working HERE or anywhere and SCALE DOWN-UP to 3.5ghz that's the easiest way...(You'll NEED the CST or 3d model)
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Kerry D. Wong disassembling and test (VNA)
Teflon PTFE allows for a very small footprint ,(smallest UWB antenna I know)
Not as good as my own LPDA ...but it could be tried on double sided PCB...(still working on it , Needs tweaking)
ALL this UWB have great gain beyond 3 ghz...not so much under it and almost NO GAIN close to 500 Mhz...(too small , too SHORT)
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when looking for Interference between solids , watch closely if you want to TRIM the first one (metal overlapping dielectric) or INSERT the Dielectric into the METAL that overlaps... TRIM or INSERT are the most useful commands before simulation...
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On 5/29/2025 at 5:57 AM, Admin said:3. What is the reason for cutting the driven element? Why is it cut on one side or both sides, and why don't we use a full circular plate like the others?
,,,,, the marginal cut of the vibrator marks an elliptical polarization
4. Why 30 degree?
,,,,,for ellipticity
Jomy maybe YOU can post an animation (GIF) of the ENERGY flowing through the driven Disk surface...(to see it turn...)
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the cable position is a NO-NO...imho
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the materials maybe... Material: galvanized iron + powder enamel. (easy to copy and test...)
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On 5/20/2025 at 0:32 PM, papagayor said:Have a look at this: https://www.printables.com/model/886120-lte-4g-biquad-antenna-806mhz/files
https://www.lte-anbieter.info/lte-hardware/antenne-bauen/bastelanleitung.php
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On 5/15/2025 at 11:03 AM, KSM said:Copper comes in different grades: M00, M0, M1, M2 and M3. The grade is determined by the purity of the copper content. M1p, M2p and M3p copper contain 0.01% oxygen and 0.04% phosphorus. Copper grades M1, M2 and M3 contain 0.05–0.08% oxygen.
Brass might be better not so easy to oxidize...or protected from moisture PURE COPPER...(aluminum, zinc,etc)
You'll have bigger losses on DIELECTRICS than metal every time
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23 hours ago, devton said:20MHz width of channel for 5GHz - that is what can help to increase speed while connecting through building
your choice of 40MHz width is good too...20 or 40 - one of this two will be best, other (wide) is not ok for this situation
is WMM on\off making any difference?
40mhz for SPEED (ideal conditions no loss of Packets or jumping signal strenghth) , 20 for stability (bad conditions , reflections , etc on 2,4ghz tho 5.8ghz is a different beast)
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29 minutes ago, Alumni said:If you add a reflector is still omnidirectional.
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PS: the cPE210 with a better antenna could have worked better than the 5ghz one...imho 15 dbi at least and Free LineOfSight...
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what are the Huawei specs...model (that's HALF the network...) walls take at least 3db (depending in lots of factor Thickness materials metal is worse) the cpe has a lot of gain and needs a perfect alignment...but the router you are accesing needs to be free of metal obstacles on the LineOfSight...if possible otherwise you end up pointing to reflections and quality degrades a lot (passing vehicles cut MY connection sometimes Line of sight obstructed)
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in Antennas 5GHz band
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