A new method to enhance the gain of a single microstrip patch antenna using spaced superstates as a dielectric parasite is presented. The experimental results of radiation pattern using alumina parasites with different thicknesses and spacings are given. The minimum beamwidth obtainable with a single patch using present studies is only 18° with symmetric lobes in the H and E planes. This simple method can also be used to vary the beamwidth of the patch between 18 and 125° with proper choice of parasite parameters.
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Afzalzadeh et al. (1992) studied this question.
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