Title: Broadband Microstrip Impedance Transformer
Authors: Kuo, Jen-Tsai
Chang, Yu-Hsien
Chung, Shyh-Jong
電信工程研究所
Institute of Communications Engineering
Keywords: Coupled-line;impedance matching;microstrip;reflection zero;transformer
Issue Date: 2016
Abstract: A broadband impedance transformer is proposed for microstrip realization and to release the tight gap size (30 mu m) required for coupled-stripline. Design curves of the transformer are obtained by solving the analytical equations derived from the transmission line theory. Two transformers are fabricated and measured. One is designed for a 1: 2 ratio and return loss better than 30 dB over a fractional bandwidth Delta=68%, and the other is a 1: 2.8 transformer with vertical bar S-11 vertical bar < -25 dB over a bandwidth of Delta = 71%. In realization, the metal traces are folded so that the circuit sizes are less than lambda/8x lambda/8. Good agreement between measured and simulation is obtained.
URI: http://hdl.handle.net/11536/134332
ISBN: 978-1-5090-0696-0
Journal: 2016 IEEE MTT-S INTERNATIONAL WIRELESS SYMPOSIUM (IWS)
Appears in Collections:Conferences Paper