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The development of Substrate-Integrated Waveguide (SIW) technology has opened new perspectives for circuits and systems in the microwave and millimeter-wave frequency range. Based on a synthesized waveguide in a planar dielectric substrate with two rows of metallic vias, SIW structures exhibit a number of advantages, including easy fabrication, compact size, low loss, and easy integration with active devices. Moreover, SIW technology permits to integrate a complete system in a single substrate, according to the System-on-Substrate (SoS) concept: SoS approach could represent the paradigm for mm-wave circuits and systems in the next decade.
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