Direct synthesis of tubular bandpass filters with frequency-dependent inductors

被引：0

作者：

Huang, Q ^{[1
]}

Liang, JF ^{[1
]}

Zhang, DW ^{[1
]}

Liang, GC ^{[1
]}

机构：

[1] Conductus Inc, Sunnyvale, CA 94086 USA

来源：

1998 IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST, VOLS 1-3 | 1998年

关键词：

D O I：

暂无

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A method for direct synthesis of a tubular filter with thin-film frequency-dependent lumped element resonators is presented. The synthesis procedure is developed with frequency-dependent inductors to accommodate large parameter aspect ratio in compact configurations. The explicit design equations are derived from required coupling coefficients among resonators, which provide a great flexibility in choosing design parameters. A design example of a 4th order bandpass filter using high-temperature superconductor (HTS) thin-film material is shown which has a 0.6% fractional bandwidth, a less than 0.2-dB insertion loss and a 20-dB return loss. Experimental data shows a good agreement with simulation performance. The technique is especially useful for designing ultra-narrowband filters where the proper coupling is difficult to achieve.

引用

页码：371 / 374

页数：4

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