Annotations for Bandwidths

A specialised form of annotations is available for to annotate impedance results and to highlight bandwidth.

Due to the varying definitions of “bandwidth” between industries and applications, definitions for both transmission and reflection bandwidths are provided.

Reflection bandwidths are typically used in antenna modelling. Transmission bandwidths are used for filters and other multi-port problems.

Note: -3 dB bandwidth refers to the frequency point where the power is at 3 dB below the maximum value or half the maximum power.
Table 1. The reflection bandwidth annotation definitions available in POSTFEKO.
Icon Icon text Description
-3 dB Reflection bandwidth Place annotation to indicate the -3 dB half power reflection bandwidth.
-10 dB Reflection bandwidth Place annotation to indicate the -10 dB half power reflection bandwidth.
-15 dB Reflection bandwidth Place annotation to indicate the -15 dB half power reflection bandwidth.
Table 2. Transmission bandwidth annotations.
Icon Icon text Description
-3dB Transmission bandwidth Place annotation to indicate the -3 dB half power transmission bandwidth.
-10dB Transmission bandwidth Place annotation to indicate the -10 dB half power transmission bandwidth.
-15dB Transmission bandwidth Place annotation to indicate the -15 dB half power transmission bandwidth.