Ground Plane Slot Structures for Isolation of Cosited Microstrip Antennas

Ground plane slot structures have been shown to reduce coupling between cosited antennas. Although some such structures have already been reported, no analytical model exists to describe their behavior and there are no design guidelines. In this work, the behavior of reported ground plane structures is used as a clue to obtain generalizable information about such structures' behavior. The structures' scalability and excitation behavior is investigated. Next a circuit model is derived that describes the interaction of microstrip patch antennas with a ground plane slot structure based on mutual admittances between the ground plane slots and the effective slots at the antennas' radiating edges. The circuit model leads to design guidelines for the ground plane slot structure and an approximate relationship between mutual admittances which must be satisfied in order to isolate the antennas. Finally, we present a novel ground plane slot structure that mitigates some of the disadvantages of earlier designs.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Electrical and Computer Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2009

Author dc:creator

• Kerby, Kiersten C.

Contributors dc:contributor

• Bernhard, Jennifer T.
• Cangellaris, Andreas C.
• Carney, Paul S.
• Franke, Steven J.

• microstrip antennas
• Isolation
• slots
• transmission line model
• mustache

Statement dc:rights

• Copyright 2009 Kiersten C. Kerby

Handle dc:identifier

http://hdl.handle.net/2142/11973

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/11973