A New Formulation for Radiated Fields Using Radiation Mode Expansions and Its Application to Radiation from Microstrip Antennas

Nagayoshi MORITA  

IEICE TRANSACTIONS on Electronics   Vol.E77-C   No.11   pp.1795-1801
Publication Date: 1994/11/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Electromagnetic Theory)
microstrip antennas,  radiation,  radiation modes,  radiation mode expansion,  FD-TD,  

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A new approach using radiation mode expansions is presented for calculating radiated fields from arbitrary distribution of electromagnetic sources in the half space region partitioned by a dielectric layer with a ground conductor. This method is applied to the calculation of radiation from microstrip-type antennas with a dielectric substrate of theoretically infinite extent. To be able to use this method, it is necessary to obtain first the field distribution around antenna patches, which is accomplished rather easily by using the FD-TD method. Radiation pattern calculations are presented for a rectangular patch antenna to verify the feasibility of this approach.