Synthesis and design of novel in-line filters with one or two real transmission zeros
Synthesis and design of novel in-line filters with one or two real transmission zeros
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DOI：
10.1109/tmtt.2004.827023
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发表时间：
2004-05
影响因子：
4.3
通讯作者：
Smain Amari;U. Rosenberg
中科院分区：
文献类型：
--
作者：
Smain Amari;U. Rosenberg
提出了一种具有一个或两个实传输零点(TZS)的伪椭圆带通滤波器的直接综合和设计方法。结果表明，要使合成成功，必须正确且唯一地确定反射系数的相位。TZS(衰减极)由输入和输出的专用谐振器产生并独立控制。每个衰减极位于其专用谐振器的谐振频率。在输入和输出端采用与频率无关的电抗来代替提取极点技术中使用的相移。通过几种波导腔滤光器的设计，验证了这种新方法的有效性。用商用全波计算机辅助设计工具对这些滤波器的特性进行了分析，结果与综合结果吻合很好。设计、制作和测试了通带上方有一个TZ的三阶滤波器。测量结果与仿真结果吻合较好。
A direct synthesis and design technique of pseudoelliptic in-line filters with one or two real transmission zeros (TZs) is presented. It is shown that the phase of the reflection coefficient must be properly and uniquely determined for the synthesis to succeed. The TZs (attenuation poles) are brought about and independently controlled by dedicated resonators at the input and output. Each attenuation pole is located at the resonant frequency of its dedicated resonator. Frequency-independent reactances at the input and output are used to replace the phase shifts used in the extracted-pole technique. This novel approach is verified by several waveguide cavity filter designs. The analyzed characteristics of these filters, obtained with commercial full-wave computer-aided-design tools, agree very well with the synthesis results. A third-order filter with one TZ above the passband is designed, fabricated, and measured. Excellent agreement between the measurement and simulation is obtained.