微帶線矩形共振器之濾波器與雙工器設計

Filter and Diplexer Design with Microstrip Rectangular Resonators

邱繼平(Chi-Ping Chu)

指導教授 ： 吳瑞北

國立臺灣大學/電機資訊學院/電信工程學研究所/碩士(2005年)

https://doi.org/10.6342/NTU.2005.01872

摘要

本論文中，首先設計體積小、選擇性好的窄頻帶通濾波器，利用交錯耦合的方式產生傳輸零點以達到高選擇性的頻率響應。
之後，利用此濾波器設計中心頻率在2GHz及3GHz的雙工器，兩濾波器以微帶線相連接，而微帶線長度須符合相位的條件。
為了減少雙工的體積大小，我們採用步階阻抗共振器將兩濾波器相結合，經由此方法可以將八個共振器縮減為六個共振器。不過，此雙工器雖然尺寸成功的縮減，但卻也降低了隔離度的品質。
之後，設計第三種雙工器，仍然使用步階阻抗共振器做結合，但結合方式不相同，兩濾波器共用相同的輸入端共振器。此新方法依然可以有效減少尺寸大小，而且仍能維持非常良好的效果，也證明了採用步階阻抗共振器做結合的可行性。

關鍵字

微帶線 ； 矩形 ； 濾波器 ； 雙工器 ； 步階阻抗共振器

並列摘要

In the beginning of this thesis, we design a compact and highly selective narrow-band filter. The highly selective response can be achieved by introducing transmission zeros which may be realized by cross coupling a pair of nonadjacent resonators of the filter.
In addition, we design the diplexer by using the above-mentioned filter designed at 2GHz and 3GHz, respectively. The two filters are connected by the microstrip lines whose lengths have to satisfy appropriate phase condition.
To reduce the diplexer size, stepped impedance resonators are adopted in the diplexer design. Through this way the eight resonators can be reduced to six. This diplexer, however, improves the size but degrades the isolation.
Another way to reduce the diplexer size is that two filters share the same input stepped-impedance resonator. And the diplexer of this type not only has a more compact size but also keeps the very good performance. Thus we have verified that this is practical to combine two filters by using stepped impedance resonators in the diplexer design.

並列關鍵字

microstrip ； rectangular ； filter ； diplexer ； stepped-impedance resonators

參考文獻

[1] G. L. Matthaei, L. Young, and E. M. T. Jones, Microwave filters, Impedance-Matching Networks, and Coupling Structures, NorWood, MA: Artech House, 1980.

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[3] R.Levy, “Filters with single transmission zeros at real and imaginary frequencies,” IEEE Trans., MTT-24, 1976, 172-181.

[5] J.-S. Hong and M. J. Lancaster, “Design of highly selective microstrip bandpass filters with a single pair of attenuation poles at finite frequencies,” IEEE Trans., MTT-48, July 2000, 1098-1107.

[6] M. Makimoto and S. Yamashita, “Bandpass filters using parallel coupled stripline ` impedance resonators,” IEEE Trans. Microwave Theory Tech., vol. 28, pp.1413-1417, Dec. 1980.