Microwave adapters are frequently used for the conversion and connection of interfaces. The standing wave attenuation of the adapters is crucial for signal transmission. CAC Electronics has successfully developed the SMA series internal adapters, N series internal adapters, and N to SMA series inter-adapters. Among these, both the N series internal adapters and the N to SMA series inter-adapters can achieve a standing wave ratio of 1.20max from DC to 18GHz. The SMA series inter-adapters achieve a standing wave ratio of 1.15max from DC to 26.5GHz, with an attenuation of less than 0.2db per piece. They can withstand more than 500 cycles of plugging and unplugging. After being used in bulk by customers, the feedback has been excellent regarding their performance.