Question about attenuation

[hamed333]

Hi, I want to measure the insertion loss of power divider with signal generator and signal analyzer, so why should we use 10 db attenuation at output port?

 

[Dan Mills]

Because 10dB pad will have a return loss of 20dB adding one helps to ensure that the impedance seen by the DUT is close to 50 ohms resistive.

73 Dan.

 

[vfone]

If you want to characterize accurately the insertion loss of a power divider (or a splitter), actually you have to provide AT ALL 3 PORTS a 10dB attenuator to get good resistive impedance at those ports.