超寬頻釔鋇銅氧微波濾波器之設計與研究

Study of Ultra-wideband Planar YBCO Microwave Filters

江謝兆焜(Jau-Kuen JiangShie)

指導教授 ： 鄭慧愷

中原大學/工學院/電子工程研究所/碩士(2009年)

https://doi.org/10.6840/cycu200900419

摘要

在本論文中，我們於鋁酸鑭（LAO）基板上以釔鋇銅氧（YBCO）高溫超導薄膜設計超寬頻微波濾波器。其主要結構包含兩部分：其一為指叉耦合（Three interdigital edge coupled microstrip lines）結構，由三條λ/4的平行微帶線所組成（為一般兩條平行的耦合微帶線所演變而來），其目的是為了增加耦合量（coupling）；另一種為步階阻抗（Stepped Impedance Resonator，SIR）結構（設計於指叉耦合結構的兩側），主要目的是使通帶兩側產生傳輸零點，而為了進一步縮小濾波器尺寸，我們將其改變為內摺式的步階阻抗結構，並成功地設計完成超寬頻之高溫超導微波濾波器，其通帶範圍為3.1～10.6 GHz，返回損失（Return Loss）大於15 dB、插入損耗（Insertion Loss）小於0.2 dB。

關鍵字

超寬頻

並列摘要

In the thesis, we discussed about how to design the ultra-wideband (UWB) planar microwave filters by using YBCO high-temperature superconductor (HTS) thin films on the LAO substrate. The resonator geometry would be constructed mainly by two parts: one is the three λ/4 interdigital edge coupled microstrip lines structure and the other is the stepped impedance resonator (SIR) structure. The three λ/4 lines structure is evolved from three parallel coupled microstrip lines, which is transformed by two parallel coupled microstrip lines, in order to enhance the coupling. The SIR structure, on the other hand, is designed to be positioned by the sides of the “three interdigital edge coupled microstrip lines” trying to realize transmission zeros. To miniaturize the size of the microwave filter, we try to amend it as a “aduncous” structure, and successfully complete the ultra-wideband HTS microwave filters. We demonstrate that the filters would carry the pass band between 3.1~10.6 GHz, with the return loss more than 15 dB and insertion loss less than 0.2 dB.

並列關鍵字

UWB

參考文獻

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