3-D 低溫共燒陶瓷與共平面波導饋入雙模環形濾波器

Abstract

在本論文中，一開始，我提到了環形共振器的原理及特性。之後我利用低溫共燒陶瓷多層製程的優點，實現立體耦合架構，並設計雙模環形濾波器。在此，我依據了不同的設計規格分別設計了兩寬頻，兩窄頻的環形濾波器，窄頻環形濾波器之頻寬小於15%，而寬頻環形濾波器之頻寬大於25%。 接下來，我在單層板中利用共平面波導饋入微帶傳輸線的方法，實現立體耦合架構，將原本在單層板中實現的平面電路設計推展到立體設計，並依此設計環形濾波器。 由於上述低溫共燒陶瓷環形濾波器所使用的埋藏微帶傳輸線和共平面波導饋入微帶傳輸線環形濾波器所使用的微帶傳輸線，其色散現象和輻射損失嚴重，然而帶線架構卻沒有這些缺點，所以再這裡我亦利用共平面波導饋入帶線的方法，實現立體耦合架構，設計環形濾波器，其量測結果可知其插入損耗大幅改進，約小1dB。

In the beginning of this thesis, I mention the basic theory and characteristics of ring resonators. Afterwards, I make use of the advantage of LTCC process to realize the 3-D coupling structure and to design dual-mode ring filters. Here, I base on different design specifications to design two broadband and two narrowband ring filters. The narrowband filters have the fractional bandwidth less than 15%. The wideband filters have the fractional bandwidth larger than 25%. In addition, I make use of the CPW-fed microstrip method to implement the 3-Dcoupling structure in the single substrate. With this approach, the uniplanar circuit design implemented in single substrate can be extended to 3-D design. Thus, the 3D ring filters become possible. Since the embedded microstrip lines used in the LTCC ring filters and the microstrip lines used in the CPW-fed microstrip ring filters possess serious dispersion phenomenon and radiation loss. One can use strip lines to avoid these disadvantages. Therefore, I further use the method of CPW-fed strip lines to realize the 3D coupling structure to modify the ring filters. Observed form the measurement, the insertion loss of this kind filter can be greatly improved (Insertion Loss < 1dB).