Design, simulation, and fabrication of a double annular ring microstrip antenna based on gaps with multiband feature

A novel double annular-ring microstrip antenna, split into six sectors, is proposed to achieve multiband operation with high gain and impedance bandwidth. The gaps on the driven and parasitic patches excite resonant frequencies that are located in the Ku-, K-, and Ka-bands thus making the antenna capable of these multiband applications. The present design is numerically and experimentally investigated. This investigation indicates that the suggested antenna achieves four operating bands, with impedance bandwidths of 1.72 GHz (12.16–13.88 GHz), 2.04 GHz (19.28–21.32 GHz), 1.54 GHz (24.04–25.58 GHz), and 1.97 GHz (27.37–29.34 GHz) which correspond to the resonant frequencies of 13.10 GHz, 20.72 GHz, 25.00 GHz, and 28.85 GHz, respectively. Also, the new design achieves good values of gain (6.11–8.31) dB and a return loss of between −16.14 dB and −21.52 dB. The commercial tool Ansoft high frequency structure simulator is used to simulate the designed antennas and it compared with the obtained measurement data. The comparison shows close agreement between the simulations and measurements.