Ultra slow-wave periodic transmission line using 3D substrate metallization

Author

Zhang, Yanyan ; Yang, H. Y David

Author_Institution

Department of Electrical and Computer Engineering, University of Illinois at Chicago, 60607 USA

fYear

2008

fDate

15-20 June 2008

Firstpage

891

Lastpage

894

Abstract

A novel ultra slow-wave transmission line structure using three-dimensional periodic substrate metallization is proposed, where each unit cell is made up of a multilayer loop as a series inductor and composite inter-digital strips as the shunt capacitor. Design trade-off between high slow-wave factor (SWF) and small group delay (dispersion) is addressed. A transmission line on a 4-layer FR4 substrate is shown with a slow-wave factor of 14. Using such an ultra slow-wave right-handed structure, a prototype of 2.4 GHz branch-line coupler with 86% size reduction compared to the microstrip line implementation is fabricated and tested.

Keywords

capacitors; inductors; metallisation; microstrip couplers; microstrip lines; slow wave structures; transmission lines; branch-line coupler; composite inter-digital strips; frequency 2.4 GHz; group delay; metallization; microstrip line; multilayer loop; series inductor; shunt capacitor; slow-wave factor; slow-wave right-handed structure; three-dimensional periodic substrate; ultra slow-wave transmission line structure; Added delay; Capacitors; Inductors; Metallization; Nonhomogeneous media; Periodic structures; Prototypes; Shunt (electrical); Strips; Transmission lines; Slow wave; branch-line coupler; electromagnetic band-gap (EBG); miniaturization; substrate metallization; transmission line;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest, 2008 IEEE MTT-S International

Conference_Location

Atlanta, GA

ISSN

0149-645X

Print_ISBN

978-1-4244-1780-3

Electronic_ISBN

0149-645X

Type

conf

DOI

10.1109/MWSYM.2008.4632976

Filename

4632976