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clanon

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Posts posted by clanon

  1. Posted · Edited by clanon

    it would be interesting...could be Laser cut or stamped...Wires have more REACTIVITY (Imaginary Z) Inductive reactance...impedance curve is always smaller...2mm copper ...maybe...

    Copper tape is easy to cut with cutter under print drawing taped on top...perfect

    you get more losses in the metal distances should stay the same and sizes...

    to keep a good Impedance and low 2 mm or LESS from reflector the Feed network

    Patches 4 mm or more from reflector (there is a step of 2 mm)

    Captura.PNG

    1 person likes this

  5. Posted · Edited by clanon

    Feed network is at 2 mm from Aluminum Reflector , Patches are at 4 mm from Reflector...

    There's a "tendency" these days to believe that Laser cutting-3D printing  and AESTHETICS are a key factor...FALLACY

    Energy doesn't care about aesthetics it only Flows were possible , mm or single degrees error don' make much of a difference

    BUT dielectric Constant MUST BE KNOWN...to get to the ballpark.

  8. Posted

    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)

     

     

    1.PNG

    gain.PNG

    rz.PNG

    s11.PNG

    vswr.PNG

    1 person likes this

  11. Posted

    Polarization of slots is 90 degrees OPPOSITE of that of Lineal Dipoles-Monopoles , etc... 

    Vertical slots = Horizontal (lineal) Polarization

    Horizontal slots = Vertical (lineal) polarization

    PS: equivalent to a Magnetic dipole due to Electric field energy on slot's borders...

    2 people like this

  18. Posted · Edited by clanon

    https://antennatestlab.com/antenna-examples/example-3-vivaldi-antennas-rfspace

    this is the MOST EXPENSIVE vivaldi out there...and it SUCKS under 1000MHZ...

    I was tryin to change that...did my research...Build some antennas after MONTHS of simulations...still do...

    LPDA is the BEST for uwb with a DIRECTIVITY (7 dbi without reflector 12-15 with reflector) CAN't beat that

    BUT it's hard to build...

    1 person likes this

  20. Posted

    YES it is complicated...but the results are REALLY GOOD

    The Vivaldis have NO GAIN...(THIS have 7dbi or more over the WHOLE BAND)

    Thinking in cutting copper tape by hand ... after printing the dwg dxf 1:1 blueprints...

    CAN NOT be made in PCB board (distance between HALFs are changing gradually from back to balun)

    making it on pcb board would get you HUGE variations on Impedance over the whole band...

     

  23. Posted · Edited by clanon

    17 hours ago, Alonso said:

    Thanks. Estoy planeando captar señales de la ionósfera (I'm planning to capture signals from the ionosphere).

    12.3 inch long x 1.02 inch diameter ferrite rod core for maximum reception

    31 cms x 2.6 cms

     

    OLD AM radio variable cap

     

    i'll try in the next days and post if GOOD..,.

    swbc1500.jpg

    1 person likes this

  25. Posted · Edited by clanon

    On 28/8/2023 at 6:00 AM, Chenobix said:

    How much sections it needs to have 10dbi or better 15dbi ? Please, can help me with more details and appliable design? ??

    Thank you for reply.

    Without a reflector (Omnidirectional) you'll need 1 meter and some to get close to 15dbi (15-20 half waves) 

     

    With reflector you could have 15dbi at under One meter...

    18650.15_010_9c3e.jpg

    1 person likes this