🔍 Key Concepts

• Impedance matching networks used between a transmitter and antenna • How adding more reactive elements (inductors/capacitors) affects filter order and harmonic attenuation • The difference in harmonic suppression between simple (L) and more complex (multi-section) networks

💭 Think About

• Which of these networks has the highest number of reactive sections and therefore behaves like the highest-order low‑pass filter? • How does increasing the number of L or Pi sections in series affect the roll‑off rate (dB per octave) of harmonics above the fundamental frequency? • Among the options, which configuration is typically chosen in transmitters specifically when cleaning up harmonics is a primary design goal rather than just basic matching?

✅ Before You Answer

• Compare how many reactive elements each network type has and which forms a higher‑order low‑pass filter. • Recall typical ham/ commercial transmitter output stages: which network is preferred where regulatory harmonic limits are strict? • Eliminate the networks that are primarily simple impedance matchers with minimal harmonic filtering.