X‐band antenna printed on a multilayered substrate

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 ( ) and horizontal ( ) planes. The overall volume of the antennais and electrical height ( ) is 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, 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.