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By optimizing the reference impedance of the T-junction power divider and reducing the impedance mutation, the working bandwidth is significantly broadened. A one-to-four T-junction broadband power divider with a center frequency of 15 GHz is designed. Its structure is mainly composed of T-junctions and microstrip transmission lines, with a size of 25×3.8 mm2. The simulation results show that, without increasing the network size and complexity, compared with the traditional four-way power divider, the working bandwidth defined by the 20 dB return loss is broadened to 3.44 octaves (6.5 ~ 24 GHz). Within the working frequency band, the insertion loss is less than 6.7 dB (including the theoretical 6 dB loss of one-to-four division). A prototype is fabricated and tested, and the measured results are in good agreement with the simulation results. This power divider features a “narrow and long”structure, making it suitable for use in broadband one-dimensional array antennas such as those in mobile communication base stations and radars, and it has a promising application prospect.
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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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