Because of limited output power from Microwave Monolithic Integrated Circuit ( MMIC) solid-state device at microwave and millimeter wave frequencies, power combining techniques are commonly used to deliver larger output power levels. 由于在微波毫米波频段微波单片集成电路固态器件的输出功率有限,广泛使用功率合成技术以获得更大的输出功率。