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An optimized design of distributed active transformer

Kim, Seungwoo and Lee, Kyungho and Lee, Jongwoo and Kim, Bumman and Kee, Scott D. and Aoki, Ichiro and Rutledge, David B. (2005) An optimized design of distributed active transformer. IEEE Transactions on Microwave Theory and Techniques, 53 (1). pp. 380-388. ISSN 0018-9480. http://resolver.caltech.edu/CaltechAUTHORS:KIMieeetmtt05

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Abstract

A novel structure distributed active transformer (DAT), which significantly reduces the coupling from the DAT to the feed line is demonstrated. A grounded guard line is implemented to isolate the feed line from the magnetic field of the DAT. The measured result of the DAT on a GaAs substrate shows a 10.5-dB reduction in the coupling. To reduce DAT loss, an air-bridge connected double primary DAT structure is implemented. The DAT at 2 GHz shows a 0.7-dB loss reduction in comparison to the conventional DAT. The improved DAT performance is related to the reduced metal resistance and closer coupling between the primary and secondary loops without any increase in the DAT area.


Item Type:Article
Additional Information:© Copyright 2005 IEEE. Reprinted with permission. Manuscript received February 26, 2004; revised May 23, 2004. This work was supported by the Ministry of Education, Korea, under the BK21 Project.
Subject Keywords:circular geometry; distributed active transformer (DAT); magnetic coupling reduction; passive loss reduction; power amplifier; power combining
Record Number:CaltechAUTHORS:KIMieeetmtt05
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:KIMieeetmtt05
Alternative URL:http://dx.doi.org/10.1109/TMTT.2004.839940
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1474
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:21 Jan 2006
Last Modified:26 Dec 2012 08:44

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