Direct-coupled, band-pass filters with λ_{o}/4 resonators
Direct-coupled, band-pass filters with λ_{o}/4 resonators
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DOI：
10.1109/irecon.1958.1150693
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发表时间：
1958
期刊：
影响因子：
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通讯作者：
G. Matthaei
中科院分区：
文献类型：
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作者：
G. Matthaei
滤波器可以设计为具有大约 lambda_{0}/4 长的谐振器，交替使用串联和并联耦合不连续性。与具有 lambda_{0}/2 谐振器的滤波器相比，其优点包括：长度更短，第二通带以 3f_{0} 为中心，而不是 2f_{0}（f_{0} 是设计频带中心），中阻带衰减更高，针对规定的插入损耗特性的精确设计易于处理更大的带宽，可以在没有电介质支撑的情况下制成“条形传输线”形式。所使用的设计程序以插入损耗为基础，并结合了 Cohn 改进的低通到带通变换。给出了实验设计的结果。还讨论了使用 lambda_{0}/4 直接耦合谐振器将晶体二极管安装在带状传输线带通滤波器上。给出了用以此方式设计的宽带混频器滤波器单元获得的实验结果。在这些实验中，操作该单元以便将宽带的相对低频微波信号转换到更高的微波频带。
Filters can be designed with resonators approximately \lambda_{0}/4 long using, alternately, series and shunt coupling discontinuities. Advantages over filters with \lambda_{0}/2 resonators include: shorter length, second pass band is centered at 3f_{0} instead of 2f_{0} ( f_{0} is design band center), mid-stop-band attenuation is higher, precision design for a prescribed insertion loss characteristic is tractable to greater bandwidths, can be made in "bar transmission line" form without dielectric supports. The design procedure used is on the insertion loss basis and incorporates an improved low-pass to band-pass transformation due to Cohn. The results of an experimental design are presented. Use of \lambda_{0}/4 direct-coupled resonators for mounting crystal diodes on strip transmission line bandpass filters is also dicussed. Experimental results obtained with a wide-band mixer-filter unit designed in this manner are presented. In these experiments the unit was operated so as to translate a wide-band of relatively low frequency microwave signals up to a higher microwave frequency band.