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    <p>distribucia prudovej hustoty je exponencialna, kde konstanta
      umernosti je hlbka vniku. Jedna hlbka vniku je jedna sigma. <br>
    </p>
    <p>Cut-off vzhladom k priemeru sme sa vsetci ucili v skole. U
      pravouhleho vlnovodu je to jednoduche, musi sa tam zmestit min.
      jedna polvlna, lebo na krajoch musia byt nuly. U vlnovodu s
      kruhovym prierezom je do toho zamontovana este Besselova funkcia.
      <br>
    </p>
    <p>vid. napr.
<a class="moz-txt-link-freetext" href="https://phys.libretexts.org/Bookshelves/Electricity_and_Magnetism/Book%3A_Applications_of_Maxwells_Equations_(Cochran_and_Heinrich)/12%3A_Waveguides/12.05%3A_Circular_Waveguides">https://phys.libretexts.org/Bookshelves/Electricity_and_Magnetism/Book%3A_Applications_of_Maxwells_Equations_(Cochran_and_Heinrich)/12%3A_Waveguides/12.05%3A_Circular_Waveguides</a></p>
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    <p>
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          <td height="39" class="oa1" width="140"
            style="height:29.2pt;width:105pt">
            <p
style="language:en-SK;margin-top:0pt;margin-bottom:0pt;margin-left:0in;
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style="language:en-SK;line-height:normal;margin-top:0pt;margin-bottom:
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    <div class="moz-cite-prefix">On 16/01/2025 16:46, Pavel Hudeček
      wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:251b2a00-4831-44d7-bb06-7ca0ff9257b3@seznam.cz">
      <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
      Je jasné, že praktická využitelnost se omezí na vlny, které se tam
      nemůžou šířit o moc vyššími módy než 00, ale čím je vlastně daná
      ta cut-off ve vztahu k průměru?<br>
      <br>
      Ještě teda zpět k mojí otázce:<br>
      Je správná úvaha, že když udělám cívku z trubky světlosti několik
      mm a stěnou třeba 1 mm, bude na ~1-100 MHz proud procházet jen po
      vnější straně?<br>
      Případně, bude trochu procházet i uvnitř, pokud bude připojená
      těsně u konců a nebudou zaslepené?<br>
      <br>
      PH<br>
      <br>
      <div class="moz-cite-prefix">Dne 16.01.2025 v 16:33 Daniel Valuch
        napsal(a):<br>
      </div>
      <blockquote type="cite"
        cite="mid:ef451d9c-3270-4aa5-a688-0c0bd21105fb@k-net.fr">
        <meta http-equiv="Content-Type"
          content="text/html; charset=UTF-8">
        <p>ano, pokial ide o TEM vlnu, ta sa vo vnutri nikdy nebude
          sirit. Maximalne kde by sa do vnutra dostal nejaky prud je,
          pokial je hrubka steny tensia/porovnatelna s hlbkou vniku. U
          150 MHz ani to nie je splnene. <br>
        </p>
        <p>A TE a TM vlny, ktore umoznuju sirenie vo vnutri trubky maju
          pre tieto priemery extremne vysoku cut-off frekvenciu
          (odhadujem 100 GHz).<br>
        </p>
        <p>b.</p>
        <p><br>
        </p>
        <br>
      </blockquote>
    </blockquote>
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