Rectangular Microstrip Antenna with Defected Patch Surface for Miniaturization and Improved Polarization Purity
A simple single element rectangular microstrip patch antenna with a semicircular defect on patch surface is proposed to eliminate the electric fields due to first higher order orthogonal mode (TM02) consequently to improve the co-polarized (CP) to cross-polarized (XP) radiation mainly in the broadside direction in H-plane without affecting its co-polarized radiation characteristics. Around 25 dB polarization purity (co-polarized to cross-polarized ratio) is obtained from the proposed structure. The optimum shape of the defect has been chosen with theoretical justification and verified through simulation. Along with the improvement of polarization purity, the proposed structure also reveals moderate gain and miniaturization.
KeywordsRectangular microstrip patch antenna Defected patch structure (DPS) Miniaturization Gain Polarization purity
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