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| {{refimprove|date=December 2007}}
| | The writer is called Wilber Pegues. Playing badminton is a factor that he is completely addicted to. My day job is an info officer but I've currently utilized for an additional 1. Some time ago he selected to reside in North Carolina and he doesn't strategy on changing it.<br><br>Feel free to surf to my website ... clairvoyance ([https://www.machlitim.org.il/subdomain/megila/end/node/12300 www.machlitim.org.il]) |
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| [[File:stripline geometry.svg|thumb|right|250px|Cross-section diagram of stripline geometry. Central conductor (A) is sandwiched between ground planes (B and D). Structure is supported by [[dielectric]] (C).]]
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| '''Stripline''' is a [[transverse mode|transverse electromagnetic (TEM)]] [[transmission line]] medium, that was invented by Robert M. Barrett of the Air Force Cambridge Research Centre in the 1950s.
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| == Description ==
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| A stripline [[Integrated circuit|circuit]] uses a flat strip of metal which is sandwiched between two [[Parallel (geometry)|parallel]] [[ground plane]]s. The insulating material of the [[Wafer (electronics)|substrate]] forms a [[dielectric]]. The width of the strip, the thickness of the substrate and the [[relative permittivity]] of the substrate determine the [[characteristic impedance]] of the strip which is a [[transmission line]]. As shown in the diagram, the central conductor need not be equally spaced between the ground planes. In the general case, the dielectric material may be different above and below the central conductor.
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| To prevent the propagation of unwanted modes, the two ground planes must be shorted together. This is commonly achieved by a row of [[via (electronics)|via]]s running parallel to the strip on each side.
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| Like [[coaxial cable]], stripline is non-[[dispersion relation|dispersive]], and has no [[cutoff frequency]]. Good isolation between adjacent traces can be achieved more easily than with [[microstrip]].
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| Stripline provides for enhanced noise immunity against the propagation of radiated RF emissions, at the expense of slower propagation speeds when compared to microstrip lines. The effective permittivity of striplines equals the relative permittivity of the dielectric substrate because of wave propagation only in the substrate. Hence striplines have higher effective permittivity in comparison to microstrip lines, which in turn reduces wave propagation speed (see also [[velocity factor]]) according to
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| :<math>v_\mathrm{p} = \frac{c_0}{\sqrt{\epsilon_{\mathrm{r,eff}}}}.</math>
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| == Alternatives ==
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| A microstrip is similar to stripline transmission line except that the microstrip is not sandwiched, it is on a surface layer, above a ground plane.
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| Stripline is more expensive to fabricate than microstrip, and because of the second groundplane, the strip widths are much narrower for a given impedance and board thickness than for microstrip.
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| ''Stripline'', now used as a generic term, was originally a proprietary brand of Airborne Instruments Laboratory Inc. (AIL). The version as produced by AIL was essentially air insulated with just a thin layer of dielectric material - just enough to support the conducting strip. The conductor was printed on both sides of the dielectric. The more familiar version with the space between the two plates completely filled with dielectric was originally produced by [[Sanders Associates]] who marketed it under the brand name of ''triplate''.<ref>Tapan K. Sarkar, ''History of wireless'', pp.556-559, John Wiley and Sons, 2006 ISBN 0-471-71814-9.</ref> | |
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| == See also ==
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| *[[Printed circuit board]]
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| *[[Distributed element filter]]
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| *[[Power dividers and directional couplers]]
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| ==References==
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| {{reflist}}
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| == External links ==
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| * [http://www.microwaves101.com/encyclopedia/stripline.cfm Stripline in Microwave Encyclopedia]
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| * [http://books.google.co.uk/books?id=NBLEAA6QKYkC&pg=PA556&lpg=PA556&dq=Stripline+history&source=web&ots=1G-MfrU6qx&sig=FnW0GtvJsU7f1bIT1jlZlAG5W68&hl=en&sa=X&oi=book_result&resnum=4&ct=result]
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| [[Category:Microwave technology]]
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| [[Category:Electronic circuits]]
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| {{electronics-stub}}
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The writer is called Wilber Pegues. Playing badminton is a factor that he is completely addicted to. My day job is an info officer but I've currently utilized for an additional 1. Some time ago he selected to reside in North Carolina and he doesn't strategy on changing it.
Feel free to surf to my website ... clairvoyance (www.machlitim.org.il)