Maximally Flat Negative Group-Delay Circuit: A Microwave Transversal Filter Approach

Author

Wu, Chung-Tse Michael ; Itoh, Takayuki

Author_Institution

Electr. Eng. Dept., Univ. of California at Los Angeles, Los Angeles, CA, USA

Volume

62

Issue

6

fYear

2014

fDate

41791

Firstpage

1330

Lastpage

1342

Abstract

A comprehensive method to synthesize negative group delay (NGD) in the microwave regime with a maximally flat response is proposed in this paper. This method is based on transversal-filter topologies; it will be shown that by choosing proper coupling coefficients of each tap of a transversal filter, we can realize NGDs with maximally flat characteristics at the output of the transversal filter. The desired coefficients to realize maximally flat NGDs with various amount of group delay are analytically derived and tabulated in this paper. Furthermore, the results are verified experimentally through microwave transversal-filter approaches in both passive and active ways using multi-section asymmetric directional couplers and distributed amplifiers.

Keywords

delay circuits; microwave filters; NGD; coupling coefficients; distributed amplifiers; maximally flat negative group-delay circuit; maximally flat response; microwave transversal filter approach; multisection asymmetric directional couplers; transversal-filter topology; Delays; Equations; Mathematical model; Microwave circuits; Microwave filters; Transfer functions; Anomalous dispersion; directional couplers; dispersion engineering; distributed amplifiers (DAs); negative group delay (NGD); transversal filters;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/TMTT.2014.2320220

Filename

6808421