International Journal of Antennas and Propagation

Volume 2007, Issue 1 076930

Research Article

Open Access

Modal-Expansion Analysis of Multiple Monopole Antennas

Quanxin Wang

Division of Communication Engineering, School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue 639798, Singapore ntu.edu.sg

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Zhongxiang Shen,

Zhongxiang Shen

Division of Communication Engineering, School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue 639798, Singapore ntu.edu.sg

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Erping Li,

Erping Li

Computational Electromagnetics and Electronics Division, Institute of High Performance Computing, National University of Singapore, 1 Science Park Road, 117528, Singapore nus.edu.sg

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Quanxin Wang,

Quanxin Wang

Division of Communication Engineering, School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue 639798, Singapore ntu.edu.sg

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Zhongxiang Shen,

Zhongxiang Shen

Division of Communication Engineering, School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue 639798, Singapore ntu.edu.sg

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Erping Li,

Erping Li

Computational Electromagnetics and Electronics Division, Institute of High Performance Computing, National University of Singapore, 1 Science Park Road, 117528, Singapore nus.edu.sg

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First published: 12 December 2007

https://doi.org/10.1155/2007/76930

Citations: 1

Academic Editor: Joshua Le-Wei Li

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Abstract

The modal-expansion method is employed to analyze an array of multiple monopole antennas. A perfectly conducting plate is introduced at the top of the monopole array to facilitate the modal-expansion analysis. Expansion coefficients in the field expressions are found by enforcing continuity conditions of the tangential field components across the regional surfaces. Cylindrical function′s addition theorem is employed to realize the transformation of field expressions in different coordinate systems. Numerical results for the S-parameters of a two-monopole antenna are presented and they are in good agreement with experimental ones. Also examined is the effect of the distance between two monopoles on the antenna′s mutual coupling and radiation pattern. A four-monopole antenna is studied for its beam-steering capability and simulated results for its radiation properties are compared with those obtained by high frequency structure simulator (HFSS).

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