Not only regulator can transform a constant voltage to some kinds of various voltages , but also the transformed voltages must be not changeable with temperature changing ( i . e . zero temperature coefficient ) . and it should be stable though the power supply is not immune . so the art of regulator design should be more challenging 電壓調節器不僅要具有將某個固定電壓轉換成所需要數值的電壓的功能,而且轉換后的電壓須具有在一定的溫度范圍內不隨溫度的變化而變化(也即零溫度系數) ,以及不受輸入電壓噪聲影響的特點,這對電壓調節器的設計提出了更高的要求。
The development of filters , resonators and other telecommunication technology required better dielectric materials . the dielectric materials , used as the resonate body , should be high in dielectric constant , low in dielectric loss and a near zero temperature coefficient of dielectric constant in high frequency band , also could be sintered in a relative low temperature so as to reduce production cost , and what ’ s more , the miniaturization and reliability of materials are also the main aspects in the research work of high frequency band dielectric materials 隨著濾波器、諧振器等器件以及通信技術的發展,人們對電介質材料的要求越來越高,要求作為介質諧振腔的電介質材料在高頻段下具有高介電常數,低介電損耗,接近于零的介電常數溫度系數,還要求高頻電介質材料能夠在較低的燒結溫度下燒成,以降低實際生產的成本,此外,材料的小型化,高可靠性也是高技術高頻介質材料的重要研究方向。