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Thread: A custom design square loop antenna for VLF detectors

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  1. #1

    Apr 2019
    11
    4 times
    All Types Of Treasure Hunting

    A custom design square loop antenna for VLF detectors

    Hi,

    I was wondering if a custom design square antenna will help to increase detection depth of a VLF detectors? Would a square loop antena work with VLF detectors?

    I'm mostly looking for maximum depth than discrimination.

    Thanks,

  2. #2
    us
    Dec 2012
    Concrete, WA
    Nokta FoRs Gold, a Gold Cube, 2 Keene Sluices and Lord only knows how many pans....not to mention a load of other gear my wife still doesn't know about!
    3,331
    5646 times
    Prospecting
    Gotta ask..why do you think a square antenna would allow for deeper
    penetration?

    The only way to find out would be to design the antenna, then test it
    for the radiation pattern in a proper antenna patterning chamber.
    Mike (aka Dizz)

    "If you love wealth better than liberty, the tranquillity of servitude better than the animating contest
    of freedom, go home from us in peace. We ask not your counsel nor your arms. Crouch down and lick
    the hands which feed you. May your chains set lightly upon you, and may posterity forget that you
    were our countrymen." ~~ Samuel Adams, 1776

    Dizzy's Super-Simple, Universal Rule of Forum Conduct: Don't be an ass.

  3. #3

    Apr 2019
    11
    4 times
    All Types Of Treasure Hunting
    Quote Originally Posted by DizzyDigger View Post
    Gotta ask..why do you think a square antenna would allow for deeper
    penetration?

    The only way to find out would be to design the antenna, then test it
    for the radiation pattern in a proper antenna patterning chamber.
    Hmm, I've only seen big square antennas being used with PI metal detectors.

  4. #4
    si
    Nov 2017
    Countryside
    2x DBP2010, eeTH, M4, GCM
    68
    64 times
    All Types Of Treasure Hunting
    Theoreticaly yes, practicaly the game ends with the size of coils you can see on a "relic striker" or similar detector. The VLF needs at least 2 coils in a probe, a tx and rx coil. A tx coil is powered continuously in contrast with PI, where short pulses are used. If you double the probe diameter, and thouse the Tx coil, the magnetic field generated will strach further away, but the field density will be at laest 4 times weaker measured at the same point. Thuse, the 4-times more energy would be required to power it. It is the same story with PI, only the short time energy bursts caries the story a bit further.
    DizzyDigger likes this.

  5. #5

    Apr 2019
    11
    4 times
    All Types Of Treasure Hunting
    Quote Originally Posted by TheGreenBoy View Post
    Theoreticaly yes, practicaly the game ends with the size of coils you can see on a "relic striker" or similar detector. The VLF needs at least 2 coils in a probe, a tx and rx coil. A tx coil is powered continuously in contrast with PI, where short pulses are used. If you double the probe diameter, and thouse the Tx coil, the magnetic field generated will strach further away, but the field density will be at laest 4 times weaker measured at the same point. Thuse, the 4-times more energy would be required to power it. It is the same story with PI, only the short time energy bursts caries the story a bit further.
    Thanks for clarification.

  6. #6
    us
    Mar 2003
    Oregon & Texas
    Custom Designs and Prototypes
    1,561
    790 times
    All Types Of Treasure Hunting
    Quote Originally Posted by Digdeeper2 View Post
    I was wondering if a custom design square antenna will help to increase detection depth of a VLF detectors? Would a square loop antena work with VLF detectors?
    Square will work, but won't give you any more depth. Perfectly round is the ideal shape for max depth. Square also has tight corners which produce small high-density fields, which increase lift-off effect. This translates into noisier ground performance.
    I believe it, therefore it is true.

  7. #7
    us
    Dec 2012
    Concrete, WA
    Nokta FoRs Gold, a Gold Cube, 2 Keene Sluices and Lord only knows how many pans....not to mention a load of other gear my wife still doesn't know about!
    3,331
    5646 times
    Prospecting
    Digdeeper, here is a tutorial (.pdf) that will give you some very good insight
    on the various antenna designs and their typical radiation patterns.

    https://www.cisco.com/c/en/us/produc...cd806a1a3e.pdf

    It's not overly technical, but those unfamiliar with antenna design and testing may
    need to look up a few words.
    Mike (aka Dizz)

    "If you love wealth better than liberty, the tranquillity of servitude better than the animating contest
    of freedom, go home from us in peace. We ask not your counsel nor your arms. Crouch down and lick
    the hands which feed you. May your chains set lightly upon you, and may posterity forget that you
    were our countrymen." ~~ Samuel Adams, 1776

    Dizzy's Super-Simple, Universal Rule of Forum Conduct: Don't be an ass.

 

 

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