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Substrate Integrated Waveguide (SIW) has been widely used in the design of microwave circuits and systems due to its low insertion loss and high-quality factor. However, compared to traditional microstrip lines, SIW has larger transverse dimensions, which limits its application in miniaturized and compact microwave circuits and systems. This paper proposes a SIW-SSPP hybrid circuit by integrating a three-dimensional SSPP structure composed of metallized blind vias and metal patches. Theoretical analysis of dispersion characteristics and full-wave electromagnetic simulations demonstrate that this SIW-SSPP integrated hybrid circuit can achieve a 30% reduction in transverse length and a 50% reduction in longitudinal length of the transmission line. Furthermore, by etching an orthogonal radiation structure on top of the SIW-SSPP hybrid circuit, a compact ultra-wideband circularly polarized leaky-wave antenna was designed. The results indicate that the antenna exhibits a return loss below -10 dB and an S21 below -6 dB within the operating frequency band of 11.2 to 17 GHz. It achieves an axial ratio of less than 3 dB between 11.2 and 16.2 GHz. The antenna's gain ranges from 10 to 15 dBic. It also features continuous scanning performance from backward space (-27°) to forward space (+30°). This design method provides a new approach for the development and design of high-performance, compact microwave, millimeter-wave, and terahertz systems.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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