A Survey on Substrate Integrated Waveguide Filters; Design Challenges and Miniaturizing Techniques for the 5G

It is believed that the substrate integrated waveguide (SIW) technology represents the emergent and the most favorable contender for the advancement of the antennas, filters and the other circuit elements operational in the region of microwave as well as the millimeter wave frequencies. SIW layouts offer the advantages of the cost-effective integration of traditional transmission lines and retain the benefits of the classical metallic waveguides, in particular high-quality factors, low losses and the large power handling capability with the self-sufficient electrical shielding. In this paper, a review of the fundamental and operational theory of the SIWs has been discussed and presented. Moreover, the challenges and design considerations in terms of microwave and millimeter filters, the different miniaturization techniques and the most important; its application and implementation for the next-generation 5G communications and beyond has been presented.