Analysis and Design of Planar, Spiral-Shaped, Transmission-Line Transformers

Author

Post, John E.

Author_Institution

Dept. of Electr. & Comput. Eng., Embry-Riddle Aeronaut. Univ., Prescott, AZ

Volume

30

Issue

1

fYear

2007

Firstpage

104

Lastpage

114

Abstract

Coupled microstrip line theory is applied to analyze planar Ruthroff transmission-line transformers (TLTs). The results demonstrate that the TLT´s low frequency response improves as the microstrip line´s even-mode impedance increases, whereas the ratio of load impedance to the line´s odd-mode impedance controls the high frequency response. Analysis of an approximate model of coupled microstrip lines formed into a spiral leads to a technique for predicting the performance of planar, spiral-shaped, Ruthroff TLTs. Microwave measurements up to 10 GHz are compared with predictions from the model for regular and suspended Ruthroff TLTs fabricated through a multichip-module deposited (MCM-D) process

Keywords

microstrip lines; microwave measurement; multichip modules; transmission line theory; coupled microstrip line theory; load impedance; microwave measurements; multichip-module deposited process; planar Ruthroff transmission-line transformers; spiral-shaped transmission-line transformers; Coupled mode analysis; Couplings; Frequency response; Impedance; Microstrip; Performance analysis; Predictive models; Spirals; Transformers; Transmission lines; Integrated passives; planar transmission-line transformer (TLT);

fLanguage

English

Journal_Title

Advanced Packaging, IEEE Transactions on

Publisher

ieee

ISSN

1521-3323

Type

jour

DOI

10.1109/TADVP.2006.890208

Filename

4084600