Filter and Diplexer Design with Microstrip Rectangular Resonators
Date Issued
2005
Date
2005
Author(s)
Chu, Chi-Ping
DOI
zh-TW
Abstract
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.
Subjects
微帶線
矩形
濾波器
雙工器
步階阻抗共振器
microstrip
rectangular
filter
diplexer
stepped-impedance resonators
Type
thesis
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