active adj. 1.活动的,有活动力的;【生物学】活性的;【电学】有功的;【无线电】有源的;【物理学】放射性的。 2.有生气的,活泼的,灵敏的,敏捷的;主动的,能动的,积极的;有力的,勤勉的;【医学】有特效的。 3.现行的,活动中的;【军事】现役的。 an active demand 畅销。 an active volcano 活火山。 The market is active. 市场活跃。 active measures 积极手段。 on active service 【军事】现役,现役中的。 take an active part [interest] in 积极参加。 adv. -ly 活跃地;积极地,能动地;【语法】主动地。 n. -ness 活跃,积极性。
be active in 对…很积极; 活跃于; 积极参加; 积极于; 在......里活跃; 在……活跃
Radio disturbance characteristics for the protection of receivers used on board vehicles , boats , and on devices - limits and methods of measurement - specifications for active antennas 道上车辆船舶和设备上用接收机保护的无线电干扰特性.限值和测量方法.有源天线规范
In addition , this paper numerically investigated the influence of the lumped parameters of the gunn diode on the frequency of the oscillation , and the tuning techniques of the oscillation frequency of the active antenna 本文还利用fdtd法数值研究了gunn二极管的集总参数对振荡频率的影响以及有源天线振荡频率的调谐技术。
Based on these theories , this paper discusses the method of design of the rectangular gunn integrated active microstrip patch antenna in detail . the size of the active antenna and the location of the device in the antenna is obtained at the specified operation frequency 根据这些理论,详细讨论了一种集成gunn二极管的矩形有源微带贴片天线的设计,得到了在给定的工作频率下的有源天线尺寸和有源器件的位置。
百科解释
An active antenna is an antenna that contains active electronic components. This allows the construction of antennas of limited size and / or wide frequency range.