High-frequency circuits are vital to the performance of aerospace and defense systems, driving communication, navigation, and surveillance technologies. This guide delves into the design of custom boards for high-frequency applications, highlighting challenges such as material selection, impedance matching, and thermal management. It explores system-level considerations, testing processes, and regulatory compliance (e.g., MIL-STD and DO-160 standards). By leveraging advanced techniques like RF packaging, EMI/EMC mitigation, and microwave design, engineers can build circuits that meet the stringent demands of aerospace and defense, ensuring reliability and efficiency under harsh conditions.

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