Could you help me polish the following sentencesCIRCULARLY polarized CP antennas are one of the important technologies in wireless communications It is well known that the use of CP wave is able to al

CP antennas, which are crucial in wireless communications, offer benefits such as reduced fading and multipath effects, as well as flexibility in antenna orientation. Several techniques have been developed to generate CP radiation, including slot antennas with elliptic cavities [1], water patch antennas with opposite truncated corners [2], and semi-eccentric annular dielectric resonant antennas [3]. However, these antennas have limited bandwidths of less than 10%, restricting their use in wideband wireless communications. To address this limitation, a cross-dipole antenna with eight parasitic shorted patches was proposed in [4], achieving an impressive -10-dB impedance bandwidth of 61.8% and a 3-dB AR bandwidth of 51.6%. However, its antenna gain is less than 5 dBic. Another approach involves using the magneto-electric (ME) dipole, known for its wide bandwidth and stable radiation pattern. In [5], a CP ME dipole antenna with L-probe feed achieved a 56.7% impedance bandwidth and 41% AR bandwidth. However, the performance of this design is highly dependent on the dimensions of the L-shaped probe. To overcome this challenge, an aperture-coupled magneto-electric (ME) dipole CP antenna was proposed in [6], boasting an impedance bandwidth of 58.2% and an AR bandwidth of 22.5%. Despite the wide impedance and AR bandwidths of the CP antennas presented in [5]-[6], their maximum gains exceed 10 dBic. Moreover, these designs [5]-[6] require a thickness greater than 0.25 λ0, where λ0 represents one free-space wavelength at the center frequency