- Stripline
Stripline is a TEM (transverse electromagnetic) transmission line media, that was invented by Robert M. Barrett of the Air Force Cambridge Research Centre in the 1950's.
Description
A stripline circuit uses a flat strip of metal which is sandwiched between two parallel
ground plane s, The insulating material of the substrate forms adielectric . The width of the strip, the thickness of the substrate and therelative permittivity of the substrate determine thecharacteristic impedance of the strip which is atransmission 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.Like coaxial cable, stripline is non-dispersive, and has no cutoff frequency. Good isolation between adjacent traces can be achieved more easily than with microstrip.
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.Disadvantages
- it is much harder (and more expensive) to fabricate than microstrip;
- because of the second groundplane, the strip widths are much narrower for a given impedance and board thickness than for microstrip.
External links
* [http://www.microwaves101.com/encyclopedia/stripline.cfm Stripline in Microwave Encyclopedia]
ee also
*
Printed circuit board
*Microstrip
*Sean Manley
*Crosstalk
* [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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