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clanon
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Everything posted by clanon
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what standard (speed) and frequencies ?...2.4 5.8 A B G N ...AC 2.4ghz b/g/n High sensitivity (- 96 dbm at 1mbps) anything with AR9271 (Tplink tl-wn 722n Version 1) 150 mbps max
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VNA measurements
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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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4:1 balun (50 ohms to 200 ohms , 75 ohm to 300 ohms , etc)
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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
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YES you treat it like a simple dipole (but polarization is 180 degrees inverted for a double quad) Then to get Circular Polarization , you need to retard 90 degrees the wave at each quarter making a 0 90 180 270 rotation (for this the easiest approach is a Quarter wave length (dielectric in coax included) from One biquad to the other...
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it should be possible with a 90 degrees (velocity factor of coax x 1/4 wavelength) between both antennas (but interactions should be simulated)...
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one of the LOWEST in the world 0.0003 at 3000 mhz , only one better Polypropylene...at higher frequencies...5.8 ghz ideal...