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12744 结果表明，在12. 5 GHz处增益可以达到24.74 dBi，天线的口径效率和1 dB增益带宽分别为44.4%和11. 2%。 The simulaton results show that the gan can reach 24.74dB at 12.5GHz. The aperture efficiency and 1dB gan bandwidth of the antenna are 44.4% and 17% respectvely.
12745 对TA天线进行加工测试，得到的测试结果和仿真结果吻合较好。 The TA is fabricated and tested, and a good agreement is achieved between simulation results and the test results.
12746 验证了该TA天线具有高增益和宽带的特性，同时也对于构造实用型TA雷达天线具有一定指导意义。 TA has the characteristics of high gain and wide bandwidth. lt is also instructive to construct a practical TA radar antenna.
12747 针对Ka波段被动毫米波成像应用，设计了一种由介质透镜与缝隙天线馈源组成的天线系统. For the Ka-band passive millimeter-wave(PMMW) imaging application, the antenna system design consisting of a dielectric lens and a Heed antenna is completed.
12748 将高斯波束理论与光学透镜中的等光程原理相结合，设计了一种大口径介质透镜,该透镜具有良好的聚焦性能。 Combining Gaussian beam theory with the equal optcal path principle in optica l lens, a large aperture dielectric lens is designed, which has excellent Hocusing performance.
12749 提出了一种新型的共轭直线渐变缝隙天线作为透镜的馈源，该天线呈现出截面小、增益高的优良性能，可以在焦平面上形成密集的馈源阵列。 A novel antipodal iinear tapered slot antenna is proposed as the Heed of the lens.
12750 将所设计的介质透镜与馈源天线进行联合仿真，研究结果表明，该系统在距透镜2.81 m处聚焦焦斑为50 mm,并且在士5。偏焦时聚焦焦斑都小于60 mm。 The antenna exhibits excellent crossection and high gain, and can Horm a dense Heed array on the He- ca pane.The designed dieectric lens and the Heed antenna are joint simuation. The results show that the antenna system has a Hoca spot oH 50mm at a distance oH 2.81mHrom the (ens and a Hoca spot oH less than 60 mm at 士 5。oHH axis.
12751 所设计的天线系统具备很好的聚焦性能且具有较大的偏焦工作角度，可以适用于被动毫米波近场成像应用。 The designed antenna system has good Hocusing perHormance and a large oHHset working angle, which can be applied to passive mlliimeter wave neai-Hield imaging applications.
12752 为进ー步提升高频(high frequency, HF)频率预测方法精度，提出了一种适用于东亚区域HF 可用频率的精细化频率预测方法。 In order to improve the accuracy of the high frequency prediction method, a refmed usable frequency prediction method suitable for high frequency prediction in East Asia is proposed.
12753 该方法在1948—2006年8个电离层观测站的特征数据统计分析基础上， 基于太阳10.7 cm辐射通量进行了 F2层OWF-MUF和HPF-MUF的转化因子时变特性建模，应用改进克里金方法重建东亚地区的空间分布。 The temporal characterstc model Hor the convers on Hactor oH OWF-MUF and HPF-MUF Hor F2layer s reconstructed based on ionospheric critica l frequency of F2 layer, which was observed at eight ionosode stations from 1948 to 2006.