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clanon
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Everything posted by clanon
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Did this with several rtl8187b with GREAT RESULTS (even better than a tp link722) MiniPCIe to USB adaptation PS: Make sure you have this two -D +D on the card (some cards don't have'em!)
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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...
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Easily 12 dbi at 725 mhz
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Could be made to ANY frequency , Circular pol (could be made lineal easy) efficiency could be better NOT using FR...
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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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4:1 balun (50 ohms to 200 ohms , 75 ohm to 300 ohms , etc)
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Still testing , Imepdance needs some work still...But looks good so far) Copper tape under 40 cm long and wide...PES foam or PU foam dielectric
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MikroTik QRT 5 is a dual-polarization 5 GHz microstrip panel antenna with a gain specified up to 24 dBi and integrated radio at just 31×32×5 cm size The plastic case looks quite robust and UV resistant. The microstrip antenna array inside consists of 64 elements (8×8), which result in 10.5° beamwidth (-3 dB). There is also a MikroTik RB911G-5HPnD-QRT board, which features a 2×2 MIMO 802.11an radio (AR9342 SoC) with 30 dBm tx power. The antenna is connected with two short MMCX pigtails.
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https://youtu.be/iOmdQnIlnRo?t=924 ,,,why it doesn't work..??
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Correct adaptation from 50 ohms to 300 ohms antenna (Quarter wave long should take velocity factor of Coax in length ) 0.66 PET , etc
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a Ratio between antenna Impedance and radio impedance the bigger the difference bigger the losses...let's sat 300 ohm antena/ 75 ohm radio 4:1 VSWR = close to 40% reflected power on TX...on RX it's gonna be WORSE...(small signal)
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0.2 0.3 BRASS paper...? and a sharp cutter...several tries (using a printed PAPER taped on top) cut through the printed lines...? solder the vertical strips... PS: 0.2 is pretty RIGID...
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Yagis hit a WALL at 15 dbi most of the times (with 15 elements and a BIG reflector)...you need 2 for 18 dbi , 4 for 21 , etc
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nope...BUT those complex feed networks steal gain (several db)
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double post
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Water absorption should be adressed in PES foam...Changes ALL. PVC pipe has THIS weirdness...
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LOOP should be CLOSED at feeding Points... then , EACH Loop should be feed with 90 degrees phase difference
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Double lineal here , NOT circular "The polarization of the emitted signal depends on the spatial location of the antenna. Horizontal - horizontal, vertical - vertical polarization. [4] The horizontal position represents when both squares are next to each other, the vertical position is when both squares are placed one above the other." DoubleBiquadOmni-Antennafor2.4GHzWirelessLinkApplication.pdf