Metallic Rings Loaded Dielectric Rod Antenna with Enhanced Gain and Bandwidth

In this paper, a dielectric rod antenna with embedded metallic rings fed by circular waveguide operating from 10.9 to 14 GHz is proposed. Different from the traditional dielectric rod antenna, the proposed antenna uses embedded metallic rings to improve the antenna gain. According to the simulation verification, the antenna gain can be greatly improved by embedding several metallic rings with a decreasing radius in the dielectric rod. The simulated results indicate that the proposed antenna can achieve a gain enhancement of 1.4-5.5 dB in the operating frequency band of 10.9-12.5 GHz. Besides, the proposed antenna can attain a symmetric radiation pattern over the entire operating bandwidth.