论文部分内容阅读
调谐滤波器一个很大的缺点是工作频率的变化(不同工作频率)要带来体积的变化。如:以调谐滤波器的体积为67.9立方英寸为例,要工作于低频,体积就要增大到200立方英寸,甚至已有达到占据500～1000立方英寸的空间位置,其数倍于这种尺寸的体积是不能容许的。需要一种什么类型的滤波器展现出频带窄、频率可调至一个倍频程或几个倍频程,而且有合理的插损,较小的体积,而又不受工作频率的影响?唯一能满足这种要求的调谐滤波器且具有良好的工作线性的就是YIG滤波器。
A big disadvantage of tuned filters is the change in operating frequency (at different operating frequencies) to bring about a change in volume. Take, for example, the tuned filter’s volume of 67.9 cubic inches. To work at low frequencies, the volume should increase to 200 cubic inches and even have space to occupy 500 to 1,000 cubic inches, several times larger than this The size of the volume is not allowed. What kind of filter is needed to show a narrow frequency band and the frequency can be adjusted to one octave or several octaves with a reasonable insertion loss and a small volume without being affected by the operating frequency? The YIG filter is a tunable filter that meets this requirement and has good linearity of operation.