TY  - JOUR
AB  - This communication demonstrates additively manufactured metal-only waveguide-based tri-band and broadband reflectarray antennas. The unit cell (UC) is implemented by cascading two metal waveguide sections with different cut-off frequencies [ f c1 and f c2 ( f c1 < f c2 )]. When illuminated with the feed antenna, the reflectarray provides different reflection paths to compensate for the spatial phase delay over triple bands, f l ( f l} < f c1 ), f m ( f c1 < f m} < f c2 ), and f h ( f h} > f c2 ). By tuning the length of the two waveguide sections and vertically adjusting the position of the UC, the phase-shifting over the triple bands can be independently controlled. In addition, because of the sharp selectivity of the waveguide, a reflectarray with the broadband achromatic feature can be achieved by properly selecting the tri-band's frequency and the cut-off frequency of the waveguides. A tri-band reflectarray centering at 25 GHz (low-band), 32 GHz (middle-band), and 37 GHz (high-band) is designed first to demonstrate the independent beam shaping over triple bands. Then, two waveguide-based reflectarrays with the broadband achromatic feature are designed, which show stable performance from 22 to 38 GHz with a relative bandwidth of 53.3%. The prototypes are conveniently fabricated using additive manufacturing, and their performance is experimentally verified.
AU  - Zhu, J
AU  - Yang, Y
AU  - Liao, S
AU  - Xue, Q
DA  - 2023/07/01
DO  - 10.1109/TAP.2023.3278799
EP  - 6190
JO  - IEEE Transactions on Antennas and Propagation
PB  - IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PY  - 2023/07/01
SP  - 6185
TI  - Additively Manufactured Metal-Only Waveguide-Based Millimeter-Wave Broadband Achromatic Reflectarrays
VL  - 71
Y1  - 2023/07/01
Y2  - 2026/06/07
ER  -