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clanon

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Posts posted by clanon

  4. Posted

    On 24/2/2024 at 4:03 PM, Edel2020 said:

    It really looks simple....what design to do to get closer to 20db at about 20 km in band 3 1800 MHz?

    Wire grill  (big 80 cms at least) OR parabolic dish EVEN BIGGER 1.2 1.5 meters

    image_29648.jpg

    1 person likes this

  9. Posted

    On 23/12/2023 at 9:00 PM, eco32 said:

    @Admin

    {,,,this construction is a bit wrong, mcNeill doesn't really do good things...!!!}

    McNeil, He performs titanic antsy work in making phantoms, but do not fully understand it, for example, phase shifters are called load coil, and so on and so on...

     

    {,,,on this forum there is such a dipole in the correct construction...!!!!}

    HAMs do not know it, I have not yet seen any HAMs construction with the use of this type of matcher/balun. Most popular is this one:

    14balun.gif

    This is material for a separate topic, LTE/Wifi antennas rarely have a balun.

     

    4:1 balun (50 ohms to 200 ohms , 75 ohm to 300 ohms , etc)

    2 people like this

  11. Posted

    On 4/12/2023 at 4:43 PM, Edel2020 said:

    How much loss will the published model have?

    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)

    Return-Loss-VSWR-Conversion-Table-scaled.jpg

  12. Posted

    On 17/11/2022 at 10:05 AM, vova.gumerov said:

    Hello Jomy! I hope everything is fine with you. And we have a disaster ....... To make such antennas, you need a 3D cutter! Such things are not done with scissors and a grinder!

    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...

    51Fka7Fwu-L._AC_UF894,1000_QL80_.jpg

  19. 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

  20. 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

  21. 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

  22. 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