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With the increasing demand for multi-function and multiband operation, more antennas have been employed in different electronic systems, which inevitably results in difficulties in antenna arrangement and severe interference. As a key technique of radio-frequency aperture integration, ultrawideband (UWB) antennas provide an effective solution to this problem. A novel miniaturized UWB H-plane ridged horn antenna with end-fire radiation property is proposed in this paper. In order to broaden the operating bandwidth, an exponential ridge is employed and the cutting-off frequency of the rectangle waveguide is significantly reduced. By extending a hyperbola-shaped dielectric lens from the horn aperture, nearly uniform aperture phase distribution is achieved along the Hplane, which leads to a significant enhancement of the end-fire gain. This antenna has a compact form factor of only 0.57 λL×0.45 λL×0.11 λL and it maintains a wide operating bandwidth ranging from 0.8 GHz to 18 GHz. Moreover, the simulated cross polarization discrimination across the operating bandwidth is better than 30 dB. The antenna structure features a low profile, good stability, and easy fabrication, which can greatly facilitate its integration with metallic structures and missiles. Compared with other reported end-fire antennas, the proposed design shows remarkable superiority in terms of its electrical size and performance.
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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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