backward adv. 向后,在后,在后方;倒,逆;回向原处。 lean backwards 往后靠。 spell backwards 倒拼;误解,曲解。 backward(s) and forward(s) 忽前忽后;来回地。 go backwards 倒退,退步,堕落。 say backwards 倒说。 adj. 1.向后方的,向后的。 2.倒的;反的,相反的。 3.落后的,晚的;迟缓的,慢的;进步慢的。 4.愚钝的;畏缩的,迟疑的,怕羞的。 a backward child 智力差(落于人后)的孩子。 The country is in a backward state. 那个国家是落后的。 Summer is backward this year. 今年夏天来得晚。 be backward in (preparations, duty) (准备)迟缓;忽视(责任)。 adv. -ly ,-ness n. 落后,迟疑。
The results indicate that compared with the antenna without reflecting structure , the proposed antenna achieves broader impedance bandwidth , increases the forward radiation gain and has stronger backward radiation suppression 结果表明,与没有地平面反射结构的天线相比,该印制偶极子天线增加了抗带宽,提高了前向辐射增益,抑制了后向辐射。
The result shows that the pbg structure has obvious character of forbidden band at the suitable size , and can be designed to good performance microwave filter . the pbg structure have the character of high resistance , that can reinforce the forward radiation , and reduce the backward radiation , increase the directivity , improve the gain and ameliorate the performance of the antenna . in addition , the pbg structure can also greatly increase the isolation and significantly decrease the coupling between the antenna elements 研究结果表面,取合适的尺寸时, pbg结构具有明显的禁带特性,可以设计成性能良好的微波滤波器; pbg结构具有高阻特性,把这种特性用于微波天线时, pbg结构可以加强前向辐射,减小后向辐射,增大天线的方向性系数,从而提高天线的增益,改善天线的性能,另外, pbg结构还可以大大提高天线单元之间的隔离度,显著减小天线单元间的耦合。