A Wide-Beam Dielectric Resonator Antenna Based on Complementary Excitation Source

In order to accurately detect and identify the target signal, the antenna is required to have the performance of wide- beam coverage. In this paper, a millimeter-wave wide-beam dielectric resonator antenna based on the principle of complementary excitation sources is proposed. It is mainly composed of two layers. The lower layer is the traditional slot array antenna, which can be equivalent to the magnetic current source along the y-axis direction. The upper layer is composed of a dumbbell meta material array, which can be equivalent to the current source along the z-axis direction and the current source along the x-axis direction. Three different excitation sources can generate complementary patterns. By properly adj usting the size of the antenna, the wider beamwidth can be obtained. Finally, a wideband wide-beam antenna operating at 30 GHz was designed and discussed. The operating bandwidth of the proposed antenna is 27.9 to 32 GHz, the maximum gain is 5.5 dBi, and the half-power beamwidth of the E-plane radiation pattern is 183°.