Using field emission cathode, X ray source can be made with several advantages: smaller volume and brighter, high frequency response, in-time turning on, etc.
采用场发射阴极的X射线光源具有体积小，辐射强度高，频率响应快，可以随时开启，无需预热的优点。
In the field of wireless correspondence, high performance of frequency source is the core part of communication facility, radar, electronic reconnaissance and resistance equipment.
在无线通信领域中高性能频率源是通信设备、雷达、电子侦察和对抗设备的核心部件。
The preliminary research result of electromagnetic prospecting with the near field(transition region) of infinite-length line source in frequency domain is presented in this paper.
本文对频率域无限长线源近区（过渡区）测深的理论基础进行了探索性研究。
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