Compact, Planar and High-Power Spatial Power Combiner by Active Integrated Antenna Technique at 5.8 GHz

Compact planar active integrated antenna arrays with a high power amplifier were developed with effective heat sink mechanism. Adding a heat extension function by an aluminum plate attached to the back side of the circuit substrate with the high power devices, a space of the air flow duct integrated in the array was created by a creased circuit substrate. Alternatively, the heat pipe was used for a compact heat sink operation. One of the high power amplifier circuits consists of the three-stage amplifier and operated with the output power of 4 W at 5.8 GHz. The 32-element active integrated antenna array stably generated the output power of over 100 W. The weight-to-output power ratio was 33.3 g/W from the weight with about 4.0 kg and the volume-to-output power was S4.4 cm 3 /W.