Synthesis of a passive complex filter using transformers

被引：8

作者：

Shouno, Kazuhiro ^{[1
]}

Ishibashi, Yukio ^{[1
]}

机构：

[1] Univ Tsukuba, Grad Sch Syst & Informat Engn, Tsukuba, Ibaraki 3058573, Japan

来源：

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS | 2008年 / 55卷 / 07期

关键词：

bandpass filter (BPF); complex; filter; passive; transformer;

D O I：

10.1109/TCSI.2008.918005

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：

In this paper, the synthesis of a passive complex filter has been described. First, a normalized real coefficient filter is transformed into a complex coefficient filter, which includes imaginary-valued resistors by using a proposed frequency transformation. Second, a complex filter using passive elements is presented. The proposed circuit consists of terminating resistors, capacitors, and transformers with finite self-inductances and coupling coefficients equal to or less than unity. A third-order complex Chebyshev bandpass filter is designed using practical passive elements, and its frequency response is measured. It is shown that the experimental circuit exhibits bandpass characteristics (90-110 kHz) and an image rejection of 53 dB.

引用

页码：1897 / 1903

页数：7

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