Energy storage in reconfigurable antennas

Wilken-Resman, Elias

Permalink

https://hdl.handle.net/2142/109551 Copy

Description

Title

Energy storage in reconfigurable antennas

Author(s)

Wilken-Resman, Elias

Issue Date

2020-08-13

Director of Research (if dissertation) or Advisor (if thesis)

Bernhard, Jennifer

Doctoral Committee Chair(s)

Bernhard, Jennifer

Committee Member(s)

• Franke, Steven
• Jin, Jian-Ming
• Schutt-Aine, Jose

Department of Study

Electrical & Computer Eng

Discipline

Electrical & Computer Engr

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

Ph.D.

Degree Level

Dissertation

Keyword(s)

• antennas
• reconfigurable antennas
• energy storage

Abstract

Despite their potential performance advantages, reconfigurable antennas have seen limited use in mobile devices. These complicated antennas can be challenging to design, especially when the structure is electrically small or mid-sized. With small elements, finite groundplanes, and switches or reactive tuning mechanisms, performance of these reconfigurable antennas is often strongly influenced by energy storage effects. Many antenna types achieve their performance characteristics through a careful balance of electric and magnetic energy storage. The distinct effects of magnetic and electric energy storage convey important information about an antenna's characteristics. However, these quantities are not individually available from typical antenna measurements like impedance, or from conventional computational techniques such as the electric field integral equation. This work describes a parallel-computing optimized method of moments code that can be used to obtain the classic method of moments impedance matrix Z = R+jX as well as the Vandenbosch energy storage matrices Xe and Xm. The energy storage matrices can be used to provide a more complete picture of how an antenna's physical structure results in radiation and electric and magnetic energy storage. Energy storage analysis techniques are applied to study familiar antennas, such as the dipole and monopole, as well as to investigate potential modifications to finite groundplanes. These techniques are then extended to develop design guidelines for reconfigurable structures, including a frequency-reconfigurable inverted-F antenna. The use of energy storage modes is found to simplify the task of designing effective electrically small and mid-sized reconfigurable antennas.

Graduation Semester

2020-12

Type of Resource

Thesis

Permalink

http://hdl.handle.net/2142/109551

Copyright and License Information

Copyright 2020 Elias Wilken-Resman

Owning Collections