What characteristic defines an impedance coupling?

Impedance coupling is defined by its ability to allow signals to pass through while minimizing the effect of loading the previous stage in the circuit. One of the key characteristics of impedance coupling is its capability to handle high frequencies effectively. This is especially important in audio and RF applications, where maintaining signal integrity at higher frequencies is crucial.

The characteristic of having very low resistance is essential, as this allows for efficient signal transfer between stages without significant loss. When coupling stages with low resistance, the system can maintain more of the signal's original amplitude and characteristics, which is beneficial for preserving audio quality and signal clarity.

In contrast, lower frequency responses or high resistance scenarios typically lead to signal loss or distortion, particularly at high frequencies. Therefore, being able to handle high frequencies with very low resistance is what distinctly defines impedance coupling in electronics.