A broadband metal coaxial resonator antenna loaded with dielectric lens

Abstract

A design method of metal coaxial resonator antenna (MCRA) is proposed in this article. According to this method, a broadband MCRA working in highorder modes is designed. The proposed antenna fuses two frequency bands of different high-order mode pairs, thus achieving 30% fractional bandwidth. The measured operating frequency band of the antenna is 2.95-4.1 GHz, in which the gain is more than 8.5 dBi. In addition, in order to improve the gain, a lowprofile dielectric lens (DL) is designed. With the DL loaded, the À10 dB S11 band shifts to 3.1-4.1 GHz, and the gain of is more than 11 dBi. A close agreement has been achieved between the measured and simulated results.