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clanon
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Everything posted by clanon
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working on IT
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i'll give it a go...this week...
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Still not 21dbi , but getting there... 24.2020H.28-08-09.pdf
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The original PAPER is on IEEE ( paid log in ) ALL QRTs MiMo seems to use it... trying to simulate it...so far no luck (i think it's PTFE the substrate...but NO DIMENSIONS ...yet
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Original design from which this antenna was "borrowed"..."stolen"... Expanded to 24 db by MikroTik nice port separation , tho...
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180 degrees cancellation...at some frequency...?
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the slit horizontal means the antenna is emitting VERTICAL polarized signal you'll see it as 2 or 3 db of increment on the reception side (vertical dipole) LineOfSight no reflections (reflections might have ANY polarization)
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5.4 - 5.5 mm from patch to reflector 17 mm ring 11 - 12 mm from edge to feeding point ALL this settings for DEEP DISHES ...f_D 0.25 to 0.3 The DISH HIGHLY INFLUENCE the FEEDER
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with the label number model etc...it should have it printed on the sleeve...(eg. RGxx)
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they INTERACT for the WORSE ! without simulation ...hard to know...
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UK 's Amateur radio unit (3.5ghz) reverse engineered to 2,4 ...working on it Using teflon as dielectric about 30 by 35 cms It SHOULD be closer to 18dbi... Efficiency still low...(depends on DIELECTRIC and Thickness)
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metal THICKNESS and DISTANCES...that's all of course SHAPES are of the utmost importance ... every time you PUT a discrete port between two metals on ANY PLACE ...CST would tell you the impedance THERE...
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That is called POLARIZATION both RX and TX should have the SAME (type of antenna) (linear) Vertical , Horizontal , CIRCULAR RH LH (used a lot on FM , it gets inside moving cars) , ELIPTICAL . you could get 3db more of signal just by moving the antena 90 degrees...
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discrete ports are the probes i'm talking about...coupling is directly calculated every time you use more than one port
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20dbi...hard to swallow... 16...17 ...maybe
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Impedance on any antenna could be tailored to any need...(with some compromises)
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when you put TWO probes you'll get S11 for the interactions as S12 and S21 in the S-parameters results...
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BI QUADs for dTV
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MOST of the times it is at the CENTER of the wire (for all cases) it's a terrific antenna...i used 1.5mm...balun is of the utmost importance. feeding line (parallel horizontal lines) distance TOO or ask the designer is a good guy replies everything ddobricic@gmail.com
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CST MWS... as it is (5cm to reflector)...is NOT GOOD this gets better at 7 cms CENTERED at 600 mhz the best results impedance as it is is close to 50 ohms (Around) it could be tunned to 75 ohms
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Impedance , vswr an S11 is wrong...so far Gain is okay at High frecuency