The invention relates to a
microwave technology, in particular to an SIW (substrate integrated
waveguide)
transmission line capable of loading direct-
current electric field bias. On the basis of the substrate integrated
waveguide, a
metal through hole structure is changed into a blocking structure, a row of inverted and identical blocking structures are additionally arranged to reduce
radiation loss, and
equivalent capacitance is increased to enable the substrate integrated
waveguide to approach
transmission performance of a traditional SIW
transmission line. The electric
schematic diagram of the blocking structure is equivalent to periodically loading a shunt
capacitor on the basis of the traditional SIW, so that the
capacitance value needs to be increased as much as possible on the premise of meeting the size requirement, namely, the spacing is reduced and the
capacitance area is increased. Compared with a single-row structure, the double-row structure has the advantages that
radiation loss is reduced, equivalently, a shunt
capacitor is additionally arranged, the
capacitance value is further increased, and the performance of the whole blocking
transmission line is close to that of an SIW (substrate integrated waveguide) transmission line. According to the invention, the function of loading a direct-current bias
electric field is met, but the loss is far lower than that of the existing strip line and
coplanar waveguide structure.