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clanon

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Posts posted by clanon

  6. Posted · Edited by clanon

    12 hours ago, eco32 said:

    once again:

    Dipole has oposit phase on the arms, biquad has same phase on the both ends, trick with phase shiter will not work here.

    LOOP should be CLOSED at feeding Points...

    then , EACH Loop should be feed with 90 degrees phase difference 

    CP.jpg

    2 people like this

  7. Posted · Edited by clanon

    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

  8. Posted

    On 11/23/2023 at 0:26 PM, eco32 said:

    Yes, Thank You!!!, it looks like his cross biquad/biloop has 8dBi isted of 10dB from single biquod, without e-field chart it's hard to tell if it's circular polarization in this design there are no phase shifters. In my opinion it has linear polatisation. (I don't have to be right, maybe there is something going on there that I have no idea about)

    Just only for Example: S-band circularly polarized crossed dipole antenna for automotive applications

    WhatsApp Image 2023-11-23 at 11.22.53.jpeg

     

    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...

    1.png

     

    1.png.164fccb9fb67f582ca615b3e74ad4a99.png

  9. Posted

    On 20/11/2023 at 6:41 PM, eco32 said:

    Add to previous post:
    I know that it is possible with dipoles, because there is an opposition phase on the "arms", I have no idea how to do it with a biquad, it has same phase on opostit corners

    it should be possible with a 90 degrees (velocity factor of coax x 1/4 wavelength) between both antennas (but interactions should be simulated)...

    1 person likes this

  13. 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

  17. 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.

  20. 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

  23. 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