最近,在各种民用机器和通信设备上已开始采用陶瓷滤波器代替LC型的中频变压器(以下用IFT表示),陶瓷比晶体具有适于成批生产、容易加工成任意形状、易做成小型化和成本低等多方面优越性,已引起注意。此外,因阻抗低,作为IC的边缘部件 Recently, ceramic filters have been used instead of LC type medium frequency transformers (hereinafter referred to as IFT) on various types of civil machines and communication devices. Ceramic crystal has the advantages of being suitable for mass production, being easily processed into any shape, Low cost and many other advantages, has attracted attention. In addition, due to low impedance, as the edge of the IC components