A Combination Unit of Local Oscillator Power Amplifier for SAR System

In this essay, a combination unit of local oscillator (LO) power amplifier for SAR system was introduced. The combination unit includes two independent power amplifier components. On the premise of ensuring performance, the micro-assembly design and process are adopted to significantly reduce the product size. This essay shows the design idea and key points, such as modular packaging, EMC compatibility and broadband amplification optimization. With the operation temperature from -40°C to 55°C, in over 7500MHz bandwidth, the power gain of LO power amplifier is greater than 20dB. Meanwhile, the output power is greater than 28dBm and the full band flatness is less than 2db. This design ensures that LO power amplifier combined unit can pass the aerospace-grade acceptance standard tests.