An asymmetric U-shaped millimeter-wave (MMW) metasurface (MS) transmitarray (TA) antenna is proposed based on characteristic mode analysis (CMA). The CMA of U-type unit shows two modes in the required frequency band and excites these two modes with a certain phase difference, so that the transmittance of the unit in the working band is greater than 0.8. The difference of lens unit is 360° by controlling the size change of the unit, and the transmission array is designed according to the phase distribution of the array. Through optimization simulation, the total size of the lens is
92.4
×
92.4
mm2, composed of
21
×
21
components and focal ratio of 0.85. The feed source is a SIW antenna, and then, the MS converts the quasispherical wave emitted from this feed source into a plane wave. The measured results show that the peak gain at 28 GHz is 22.3 dBi, the gain bandwidth at 3 dB is 5.8°, and the radiation efficiency is 81.6%. Due to the high gain and low-cost design, the proposed MS transmitarray antenna is suitable for MMW communication.
A wideband millimeter‐wave circularly polarized (CP) antenna based on metasurface (MS) is proposed. The antenna consists of a two‐layer substrate integrated waveguide (SIW) feed structure and a layer of MS with a 2 × 2 rectangular truncated corner. As a polarization conversion structure, the MS converts the linearly polarized wave generated by the SIW into a CP wave, and four metal pins are placed in the middle to improve the impedance and the axial ratio (AR) bandwidth. Based on this antenna element, a SIW‐fed 2 × 2 array using the sequentially rotating phase (SRP) feed technique is designed, which further improves the AR bandwidth and the gain level of the antenna. The results of the measurements show that the array maintains a low profile with an impedance bandwidth of 40.3% from 25.05 to 37.14 GHz, and an AR bandwidth of 31.3% from 23.14 to 32.54 GHz, and a peak gain of 14.3 dBi.
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