It is discussed in this paper the spaces with σ-point-discrete N_0-weak bases. The main results are： （1） A space X has a σ-compact-finite N_0-weak base if and only if X is a k-space with a σ-point-discrete N_0-w...It is discussed in this paper the spaces with σ-point-discrete N_0-weak bases. The main results are： （1） A space X has a σ-compact-finite N_0-weak base if and only if X is a k-space with a σ-point-discrete N_0-weak base; （2） Under （CH）, every separable space with a σ-point-discrete N_0-weak base has a countable N_0-weak base.展开更多
文中介绍了微带波导转换、一分八和一分三波导功分网络。利用国产15 W Ga N功率单片,首先设计8路波导功率合成,然后进行3路波导功率合成,最后构成24路合成。在毫米波频段2 GHz带宽内,整体24路波导功率合成网络合成损耗<0.8 d B,合成...文中介绍了微带波导转换、一分八和一分三波导功分网络。利用国产15 W Ga N功率单片,首先设计8路波导功率合成,然后进行3路波导功率合成,最后构成24路合成。在毫米波频段2 GHz带宽内,整体24路波导功率合成网络合成损耗<0.8 d B,合成效率达到83%,解决了传统合成电路合成效率随合成网络级数增加而下降的问题,满足了高效率与大功率的要求。展开更多
基金Supported by the National Natural Science Foundation of China (10971185, 11171162, 11201053)China Postdoctoral Science Foundation funded project (20090461093, 201003571)+1 种基金Jiangsu Planned Projects for Teachers Overseas Research FundsTaizhou Teachers College Research Funds
文摘It is discussed in this paper the spaces with σ-point-discrete N_0-weak bases. The main results are： （1） A space X has a σ-compact-finite N_0-weak base if and only if X is a k-space with a σ-point-discrete N_0-weak base; （2） Under （CH）, every separable space with a σ-point-discrete N_0-weak base has a countable N_0-weak base.
文摘文中介绍了微带波导转换、一分八和一分三波导功分网络。利用国产15 W Ga N功率单片,首先设计8路波导功率合成,然后进行3路波导功率合成,最后构成24路合成。在毫米波频段2 GHz带宽内,整体24路波导功率合成网络合成损耗<0.8 d B,合成效率达到83%,解决了传统合成电路合成效率随合成网络级数增加而下降的问题,满足了高效率与大功率的要求。
