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An analysis of single-feed circularly polarized microstrip antenna using boundary element method

✍ Scribed by Hiroyuki Ohmine; Yonehiko Sunahara

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
852 KB
Volume
79
Category
Article
ISSN
8756-6621

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✦ Synopsis

This paper presents an analysis method of a singlefeed circularly polarized microstrip antenna (MSA) by means of the boundary element method. When the boundary element method is applied to such open planar circuits as the microstrip antenna, the loss due to radiation must be taken into consideration. As the radiation loss, it is proposed that the radiation admittance obtained from the radiated field from a microstrip antenna with a basic shape be used as the load. This radiation admittance can be derived easily without any complicated calculations.

As examples of the application of this analysis method, the computed values of the input impedance and the axial ratio are compared for the circular and rectangular MSAs with small sectors to remove the degeneracy and for the circular MSA with a shorting pin inside so that the effectiveness of the method is demonstrated. Also, an impedance matching method is proposed at the frequency for the minimum axial ratio by cancelling the inductance of the feed pin by means of the change of the positional relationship of the feed point and the small sectors.

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