I. Preface

With the advancement of communication technology, Monolithic Microwave Integrated Circuits (MMICs) are playing an increasingly critical role in high-tech fields such as electronic warfare, wireless networks, radar, satellite communications, and global positioning systems. In these systems, the packaging of MMICs is a key factor influencing system performance. As demands for system integration, module miniaturization, and overall cost control continue to rise, more and more MMICs are being supplied in a pre-packaged form. This approach allows module and system manufacturers to perform integration, assembly, and maintenance more efficiently. Moreover, MMIC packages compatible with surface-mount technology (SMT) can significantly enhance system integration levels and reduce assembly costs. Consequently, MMIC packaging has become an indispensable and vital component of MMIC products. Ceramic packaging offers hermeticity, and the advantages of this type of packaging include:

II. QFN Ceramic Package Structure

III. Manufacturing Process Flow of LTCC Ceramic Packages

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