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Improved model for microstrip antennas loaded by metallic vias with lumped elements

Published online by Cambridge University Press:  03 March 2025

Fúlvio F. Oliveira
Affiliation:
Laboratory of Antennas and Propagation, Aeronautics Institute of Technology, São José dos Campos, SP, Brazil
Juner M. Vieira*
Affiliation:
Division of Space Electronics and Computing, National Institute for Space Research, São José dos Campos, SP, Brazil
Daniel B. Ferreira
Affiliation:
Laboratory of Antennas and Propagation, Aeronautics Institute of Technology, São José dos Campos, SP, Brazil
Daniel C. Nascimento
Affiliation:
Laboratory of Antennas and Propagation, Aeronautics Institute of Technology, São José dos Campos, SP, Brazil
*
Corresponding author: Juner M. Vieira; Email: [email protected]

Abstract

This letter presents an improved analytical model for analyzing probe-fed microstrip antennas loaded by metallic vias with lumped terminations. The proposed formulation is based on the resonant cavity model and enables efficient analysis of such perturbed radiators for various types of terminations. The model is validated through the analysis of two antennas: one operating in a TM00 mode and the other with four capacitive terminations to produce circular polarization. Moreover, a reconfigurable RHCP/LHCP antenna based on the patch with capacitive terminations has been manufactured and tested, showing a broadside axial ratio below 0.5 dB at 1.575 GHz.

Type
Research Paper
Copyright
© The Author(s), 2025. Published by Cambridge University Press in association with The European Microwave Association.

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