– Introduces wave propagation in guided structures early on to leverage students' prior knowledge of circuits.

A clear listing of known variables from the problem statement.

Which (e.g., Smith Charts, Maxwell's Equations) is giving you the most trouble?

The solutions PDF typically includes:

A large number of free "solution PDFs" circulating online are actually unofficial compilations created and shared by students and educators. These are often found on educational resource-sharing websites.

The mathematical language used to describe spatial fields.