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Full-wave spectral analysis and design of annular patch antenna with electromagnetically coupled microstrip feed line

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3 Author(s)
Pirinoli, P. ; Dept. of Electron., Politecnico di Torino, Italy ; Vecchi, G. ; Orefice, M.

This paper presents a full-wave analysis, and the ensuing design considerations, of the annular patch antenna fed by an electromagnetically coupled microstrip line. The numerical analysis employs the spectral domain version of the integral equation, with the method of moments formulation; the basis functions on the ring patch are the eigenmodes of the corresponding magnetic wall cavity, and subsectional (rooftop) functions are employed on the access line. Both TM and TE modes are used, along with more-efficient "collective" solenoidal modes; mode sorting criteria are given to ensure uniform convergence. Efficient schemes are presented for the calculation of the spectral-domain reaction integrals, along with criteria to avoid calculation of negligible mode-to-mode couplings, based on the spectral analysis of the matrix condition number. Very good agreement is shown with measured data, and design considerations are given for matching the radiator.

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Antennas and Propagation, IEEE Transactions on  (Volume:52 ,  Issue: 9 )