章频，建州浦城人。与弟頔皆以进士试礼部预选，会诏兄弟毋并举，频即推其弟，弃去。后六年，乃擢第。自试秘书省校书郎、知南昌县，改大理寺丞、知九陇县，迁殿中丞。
第三章介绍了微波混频器及镜频抑制混频器的工作原理，讨论了设计微波镜频抑制混频器中应该注意的一些问题。
In chapter three, after presenting the working principle of mixer and image-reject mixer, some problems which should be paid attention to during the mixer design are discussed.
第四章选择早迟门同步捕获法进行了的短波高速跳频系统的同步软件设计。
Chapter IV chooses early-late door synchronization acquisition algorithm to design the shortwave fast frequency-hopping synchronization system.
本文的第二章介绍了单频激光器的理论，是本论文的理论基础。
The second chapter introduces the theory of single-frequency laser, and it is the theoretical basis of this paper.
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