A generalized theory of tapered transmission line matching transformers and asymmetric couplers supporting non-TEM modes

Author

Pramanick, Protap ; Bhartia, Prakash

Author_Institution

COM DEV Ltd., Cambridge, Ont., Canada

Volume

37

Issue

8

fYear

1989

fDate

8/1/1989 12:00:00 AM

Firstpage

1184

Lastpage

1191

Abstract

A general Fourier transform pair for the analysis and synthesis of tapered transmission lines supporting a non-TEM (transverse electromagnetic) mode is presented. The Fourier transform pair first pointed out by F. Bolinder (1950) for TEM lines is shown to be a special case of the present transform pair. The transform pair is mathematically rigorous and simple enough to implement on a desktop computer for the design of dispersive transmission line tapers. A step-by-step synthesis method is described for exact designs of matching transformers and asymmetric couplers. The theory is verified with the design of two Ka-band finline tapers and a C-band microstrip coupler

Keywords

Fourier transforms; impedance matching; waveguide couplers; C-band microstrip coupler; Fourier transform pair; Ka-band finline tapers; asymmetric couplers; dispersive transmission line tapers; non TEM modes; synthesis method; tapered transmission line matching transformers; Chebyshev approximation; Couplers; Finline; Fourier transforms; Frequency; Impedance; Microstrip; Propagation constant; Transformers; Transmission line theory;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.31077

Filename

31077