Insertion loss

The insertion loss (engl. Insertion Loss , IL ) is the attenuation of a signal at by a member which is inserted in a signal path. This can be a passive filter or a plug connection , for example . ${\displaystyle a_{I}}$

The insertion loss describes the relationship between the incident power (on the component) and the power transmitted . Since the insertion loss is given in dB , the following formula is used: ${\displaystyle P_{\text{in}}}$ ${\displaystyle P_{\text{out}}}$

${\displaystyle a_{I}=10\log \left({\frac {P_{\text{in}}}{P_{\text{out}}}}\right)\,\mathrm {dB} }$

With filters and couplers , the insertion loss is usually determined depending on the frequency range of the useful signal .

The insertion loss can also be expressed using the scattering parameters (S parameters) as:

${\displaystyle {\begin{aligned}a_{I}&=-10\log \left(\left|S_{21}\right|^{2}\right)\,\mathrm {dB} \\&=-20\log \left(\left|S_{21}\right|\right)\,\mathrm {dB} \end{aligned}}}$

literature

• Andres Keller: Data transmission in the cable network. Technical principles and standards. 2nd Edition. Springer Verlag, Berlin / Heidelberg 2005, ISBN 3-540-22501-3 .
• Günter Knoblauch: Connectors. Volume 2: New Technologies - Products and Management Concepts. 3. Edition. Expert Verlag, Renningen 2004, ISBN 3-8169-2593-6 .
• Michael Reisch: Electronic components. Function - basic circuits - modeling with SPICE. Springer Verlag, Berlin / Heidelberg 1998, ISBN 3-662-06988-1 .

See also

• Noise attenuation

Web links

• KT manual (accessed on August 11, 2017)
• Insertion Loss (Typical Values) (accessed August 11, 2017)