ABB KSD211B101 3BHE022455R1101 Input Coupling Unit ICU KS D211 B.The important indicators of KS D211 B101 coupler are coupling degree and insertion loss. The coupling degree is the power ratio of the coupling port to the input port, in dB, and is generally negative. The greater the absolute value of the coupling degree, the less things to take away, and the smaller the loss of the natural coupler. Plug loss is the ratio of output port power to input port power. The greater the absolute value of coupling degree, the smaller the absolute value of insertion loss.
The relationship between insertion loss (dB) and coupler coupling degree (dB) can be expressed as:
A coupler with a coupling degree of −10dB has an insertion loss of −0.5dB. Take the absolute value, and then consider the medium loss, the general insertion loss will be larger, different manufacturers are different, the general insertion loss can be about 0.7dB. If the input port power is 15dBm, the coupling port power of the coupler is 15DBm-10dB =5dBm, and the output port power is 15DBm-0.7dB =14.3dBm.
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