A simple and compact rectangular microstrip patch antenna (RMPA) with dumbbell shaped defected ground structure has been proposed and investigated experimentally for significant suppression of cross polarised (XP) radiation compared with maximum co‐polarised gain without affecting the co‐polarised radiation pattern. The investigation shows that the proposed antenna has an excellent co‐polarised radiation to XP radiation isolation over wide elevation angle around the broadside for different aspect ratio (width to length ratio or W/L) of RMPA. The proposed idea is justified in the light of concrete theoretical analysis.

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In this communication, a single element high‐gain antenna with wide half power beamwidth (HPBW)is reported. The antenna exhibits high gain (10.01 dBi) and excellent radiationefficiency (98.8%) with wide HPBW in both vertical (110∘) and horizontal (118∘) planes. The overall volume of the antennais 2λ0×1.5λ0×0.053λ0 and electrical height (k0h) is 0.38 at at centre frequency 11 GHz. Thedielectric constant of the multilayered substrate is extracted using resonantcavity model of a rectangular microstrip antenna. The proposed antenna operatesat higher order, TnormalM02 mode excited by the loaded parasitic on theupper layer of the substrate and behaves similarly to a two‐dimensional‐leakywave antenna. The loaded parasitics are transforming the capacitive behaviour ofthe antenna input impedance into the inductive. The antenna offerswide‐impedance bandwidth of 1.01 GHz and 610 MHz considering the inputreflection parameter below −10 dB and −20 dB, respectively. It exhibits a verygood antenna figure of merit of 1.03 in terms of gain, bandwidth, HPBW andelectrical height. The prototypes of the antennas are fabricated and executionis accepted using measured results.