标题: | Microstrip stepped impedance resonator bandpass filter with an extended optimal rejection bandwidth |
作者: | Kuo, JT Shih, E 电信工程研究所 Institute of Communications Engineering |
关键字: | microstrip;microwave filter;spurious response;stepped impedance resonator (SIR);transmission zero |
公开日期: | 1-五月-2003 |
摘要: | Bandpass filters with an optimal rejection bandwidth are designed using parallel-coupled stepped impedance resonators (SIRs). The fundamental (f) and higher order resonant harmonies of an SIR are analyzed against the length ratio of the high-Z and low-Z segments. It is found that an optimal length ratio can be obtained for each high-Z to low-Z impedance ratio to maximize the upper rejection bandwidth. A tapped-line input/output structure is exploited to create two extra transmission zeros in the stopband. The singly loaded Q(Q(si)) of a tapped SIR is derived. With the aid of Q(si), the two zeros can be independently tuned over a wide frequency range. When the positions of the two zeros are purposely located at the two leading higher order harmonics, the upper rejection band can be greatly extended. Chebyshev bandpass filters with spurious resonances up to 4.4f(o), 6.5f(o), and 8.2f(o) are fabricated and measured to demonstrate the idea. |
URI: | http://dx.doi.org/10.1109/TMTT.2003.810138 http://hdl.handle.net/11536/27885 |
ISSN: | 0018-9480 |
DOI: | 10.1109/TMTT.2003.810138 |
期刊: | IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES |
Volume: | 51 |
Issue: | 5 |
起始页: | 1554 |
结束页: | 1559 |
显示于类别: | Articles |
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