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On Q-factor Bounds for Lossy Embedded Antennas in Electrically Small Devices
KTH, School of Electrical Engineering and Computer Science (EECS), Electromagnetic Engineering.ORCID iD: 0000-0001-7269-5241
Univ Cote Azur, CNRS, LEAT, Sophia Antipolis, France..
2019 (English)In: 13th European Conference on Antennas and Propagation, EuCAP 2019, IEEE, 2019, article id 8739833Conference paper, Published paper (Refereed)
Abstract [en]

In this paper we investigate a method to determine the best available bandwidth for small embedded antennas. The available bandwidth depend both on the size and the position within a device, but also on the ohmic losses in the structure. Here we use that solutions to a non-convex optimization problem to predict the available bandwidth for a range of surface resistances. The optimization problem utilizes stored energies, and it is phrased as a current optimization problem. We illustrate the method by comparing the results with embedded antennas in a small IoT terminal. We show that an optimized embedded come rather close to the bounds.

Place, publisher, year, edition, pages
IEEE, 2019. article id 8739833
Series
Proceedings of the European Conference on Antennas and Propagation, ISSN 2164-3342
Keywords [en]
antenna, efficiency, Q-factor, constrained optimization
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-257477ISI: 000480384701160Scopus ID: 2-s2.0-85068483471ISBN: 978-8-8907-0188-7 (print)OAI: oai:DiVA.org:kth-257477DiVA, id: diva2:1348456
Conference
13th European Conference on Antennas and Propagation (EuCAP), MAR 31-APR 05, 2019, Krakow, Poland
Note

QC 20190904

Available from: 2019-09-04 Created: 2019-09-04 Last updated: 2019-09-04Bibliographically approved

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Jonsson, B. Lars G.

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