Experimental Evaluation of Dielectric-filled SIW Filter Continuous Wave Power Handling

In this paper, an experimental evaluation of the continuous wave power handling of dielectric-filled SIW filters is reported. First, the evaluated 400 MHz bandwidth four-pole dielectric-filled SIW filter centred at 21.4 GHz and based on 0.508 mm thick 6002 Rogers substrate is presented with its small signal measurement using a WR51 test fixture specially designed to handle high-power test. Then, the four-pole filter is tested using the test fixture in atmospheric conditions at ambient temperature and continuous wave power. It is shown that the evaluated four-pole filter was able to handle as much as 100 W of continuous wave power before destruction. To the author’s best knowledge, such experimental evaluation has never been reported in the literature, mainly because conventional dielectric-filled SIW is not intended for high-power applications. However, with the emergence of new threats, especially for military and space microwave systems, it becomes important to assess the power handling limitation of SIW components and circuits.