100 ADS Design Examples Based on the Textbook: RF and Microwave Circuit Design
Michael Benker
Example 1.3-1A Plot the impedance of a 50 Ω ideal resistor in ADS over a frequency range of 0 to 2 GHz.

Thereby noting that an ideal resistor maintains constant impedance with respect to frequency.

You were here and you read it, so don’t forget it.