Samuel Liao’s book has seen multiple editions (the 3rd edition is the most common). Ensure the manual matches your specific textbook to avoid mismatched problem numbers.

Samuel Y. Liao’s "Microwave Devices and Circuits" is a foundational electrical engineering textbook focusing on active and passive components, with solution manuals providing step-by-step mathematical proofs for end-of-chapter problems. The accompanying solution manual offers essential derivations for topics such as waveguides, S-parameter matrices, and microwave tubes. You can find resources and solutions on sites like Open Library . Solutions manual [for] Microwave devices and circuits

Includes detailed solutions for end-of-chapter problems across all 12 chapters of the textbook, from electromagnetic plane waves to monolithic integrated circuits.

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While the specific appendage ".67" in the search query may refer to a file format, page number, or specific problem index, it highlights a common challenge in engineering education: the need for targeted clarification.