A Design Of A Millimeter Wave Power Divider/combiner Based On Substrate Integrated Waveguide

Since the mid-20 th century, researchers from different countries have conducted a series of researches on microwave and millimeter wave power combining technology. However, with the increasing of operating frequency, the sizes and capacities of solid-state devices have decreased continually, and high frequency millimeter wave testing of the instruments usually were used as a standard rectangular waveguide interface. So exploring the millimeter wave high frequency power divider/combiner technology and rectangular waveguide transition structure becomes very necessary. As a planar circuit structure, SIW has a rectangular waveguide characteristics similar to the electromagnetic field. This structure has been proposed since the twentieth century,it have been attracted wide attention of scholars.In this paper, we performed a theoretical analysis of the similarity between SIW and the rectangular waveguide, and the systematic study of the structure of the substrate integrated waveguide effect on its performance. At the same time we analyze the equivalent relationship between SIW and rectangular waveguide. We will apply SIW to the power divider/combiner technology, we propose a method based on SIW longitudinal grooving power divider/combiner scheme, the structure has good amplitude and phase characteristics.According to the actual testing environment, we design a rectangular waveguides-SIW transition structure. We use the antipodal fin-line technology for a W-band SIW-Rectangular Waveguide transition, this transition have a work band of 86.4-106.1GHz, its return loss is more than 15 dB, the insertion loss is less than-2d B, this transition has a good test performance.Finally, we combine the antipodal fin-line technology into the longitudinal slotted of the SIW power dividing/combining systems, the back-to-back structure of the four-way power divider/combiner works in the band of 92.8-93.8GHz within the return loss is more than 10 dB, and the insertion loss is less than-3.9dB, these test results are more desirable. It has also laid a good foundation for using SIW to the millimeter wave spatial power combining technology.