A Wideband Polarization Grid Loaded Circularly Polarized Laminated Resonator Antenna

A novel wideband circularly polarized (CP) Laminated Resonator Antenna (LRA) is presented in this paper. First, a differential pair of L-probes is inserted into the LRA to excite the dominant mode TE
₀₁₁
^x
of LRA for wide impedance bandwidth. Then, a frequency-insensitive dielectric polarization grid is placed in front of the LRA to obtain broadband CP radiation. The inhomogeneous property of the adopted grid can realize two orthogonal linearly polarized waves with a 90° phase difference and equal amplitudes within a wide operating band. Simulation results show that the proposed LRA achieves a CP bandwidth from 4.42 GHz to 5.75 GHz (26.16%) and a peak gain of 9.82 dBi. Featuring simple, low-cost structure and wideband characteristics, the proposed LRA is a promising candidate for the future fifth-generation (5G) communication systems.