The most common impedances that are widely used are 50 or 52 ohms, and 75 ohms, although other impedances are available for specific applications.
2.
In radio-frequency applications up to a few gigahertz, the wave propagates primarily in the single central conductor also exists in coax but this mode is effectively suppressed in coax of conventional geometry and common impedance.
3.
In RF ( radio frequency ) applications, the L network is the basis of many common impedance matching circuits, such as the pi network employed in amplifiers and the T network that is common in transmatches.
4.
No, the answer is clearly given in my earlier post just below : It is Common impedance coupling On which we dont seem to have an article .-- talk ) 21 : 18, 14 January 2008 ( UTC)
5.
Designers of printed circuit boards must take care in the layout of electronic systems so that high-power or rapidly switching currents in one part of a system do not inject noise into low-level sensitive parts of a system due to some common impedance in the grounding traces of the layout.
6.
In addition to other common impedance matching techniques, this is sometimes accomplished by connecting the transmission line not directly to the loop but to a smaller " feed loop ", typically 1 " / " 8 to 1 " / " 5 the size of the loop antenna.
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