Studies on average power handling capacity of SIW with heat transfer theory

Substrate-integrated waveguide (SIW) is an artificial waveguide constructed on dielectric substrate, which takes the advantages of rectangular waveguide and microstrip and has drawn many attentions in recent years. Heat transfer theory is adopted to study the Average Power Handling Capacity (APHC) of SIW. By comparing the maximum temperature with the heat distortion temperature of the substrate material, the value of APHC can be determined. Some interesting results are concluded in this paper and can expect to give some useful guidance to the design of SIW devices, especially for the high power case.