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No to je jasné, ale mě šlo o to, jestli může proud, pokud je k
dispozici vhodná trasa, natéct po povrchu otevřenými konci i dovnitř
a procházet i tam, tedy využít oba povrchy trubky, jak uvažoval
Martin ve 14:41.<br>
<br>
PH<br>
<br>
<div class="moz-cite-prefix">Dne 16.01.2025 v 16:56 Daniel Valuch
napsal(a):<br>
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cite="mid:26aef537-617a-4b2f-840f-538868b49403@k-net.fr">
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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"
moz-do-not-send="true">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>
<p><br>
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<p> </p>
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<p
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none;word-break:normal;punctuation-wrap:hanging"><span
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"Cambria Math";mso-fareast-font-family:"Cambria Math";language:en-US;
font-weight:normal;font-style:normal">x⁄δ</span></p>
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<p
style="language:en-SK;line-height:normal;margin-top:0pt;margin-bottom:
0pt;margin-left:0in;margin-right:0in;text-indent:0in;text-align:center;
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"Cambria Math";mso-fareast-font-family:"Cambria Math";language:en-US;
font-weight:normal;font-style:normal">J_x⁄J_0 </span></p>
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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>
</blockquote>
</blockquote>
</blockquote>
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