🔍 Key Concepts

• m-derived filter vs constant-k filter in RF/communication circuits • Purpose of adding a trapped (resonant) section near the cutoff frequency • How filter design handles steep attenuation near cutoff without ruining the passband

💭 Think About

• Ask yourself: Why would engineers modify a simple constant-k filter? What performance problem are they trying to fix near the cutoff frequency? • Think about whether an m-derived filter is named for its circuit drawing shape, a math property, or a particular added feature in the network. • Which choice specifically mentions improving attenuation at frequencies just beyond the passband, and how might that be achieved in practice?

✅ Before You Answer

• Identify which option mentions a feature that improves attenuation close to the cutoff frequency. • Check if any choice describes a property that sounds overly general (e.g., could apply to many filter types) rather than being specific to m-derived design. • Verify which option connects an added resonant or trap-like element to the behavior of the filter near cutoff.