Dual-Wideband Dual-Circularly Polarized Reflectarray Based on Multiresonant Structure for K-Band and Ka-Band Applications

In this letter, a dual-wideband dual-circularly polarized (CP) reflectarray (RA) with 1013 dual-CP RA cells is proposed. The overall size is 161 × 161 × 1.8 mm. Composed of a metal reflection plate and a substrate printed with circuits of fan-shaped, arc-shaped and rectangular patterns, current paths with different lengths can be formed, and multiple resonance points can be introduced to expand the working bandwidth (BW). The −10 dB cross-polarization BW of cells has reached 83.67% (16.03–39.09 GHz). Center frequencies of the right-handed (RH) CP and left-handed (LH) CP reflected beams are designed to point along (
ϕ
,
θ
) = (90°, 20°) at 19 GHz and (
ϕ
,
θ
) = (90°, −20°) at 31 GHz. Specifically, the 3 dB gain BW of RHCP and LHCP reflected beams is 43.8% (7.3–27.0 GHz) and 47.1% (24.5–39.6 GHz), respectively. 1.5 dB axial ratio (AR) BWs are greater than 90.1%. The dual-wideband and dual-CP characteristics enable the proposed RA to meet the communication requirements of satellite communication transmission and reception at the same time and become a promising candidate technology for long-distance communication for
K
-band and
Ka
-band applications.