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clanon

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About clanon

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  1. 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)
  2. 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
  3. I'd never found a good feed for DEEP DISHES ( i have a 1,26 m , 0.31 m deep dish F/d 0.25 ) THIS IS IT This brasilian colleague designed an small patch for 432 MHZ satélite double polarization (i only needed ONE) What's most important to me are the 180 degrees of illumination at about -6 db of gain... -6dB beamwidth of around 180 deg (good for f/D ratios 0.25 (focal plane dishes) to 0.3) -6dB in beamwidth corresponds to a -10dB edge illumination (max gain) since there is an additional -4dB spreading loss to the edge at these low f/D ratios. the coax is running inside a graphite tube (all i have at hand from a broken arrow) center of patch and coming back from behind
  4. yagi

  5. yagi

    with the label number model etc...it should have it printed on the sleeve...(eg. RGxx)
  6. they INTERACT for the WORSE ! without simulation ...hard to know...
  7. 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...
  8. 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...
  9. discrete ports are the probes i'm talking about...coupling is directly calculated every time you use more than one port
  10. 20dbi...hard to swallow... 16...17 ...maybe
  11. Impedance on any antenna could be tailored to any need...(with some compromises)
  12. when you put TWO probes you'll get S11 for the interactions as S12 and S21 in the S-parameters results...
  13. BI QUADs for dTV
  14. 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