Journal
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
Volume 71, Issue 7, Pages 6185-6190Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2023.3278799
Keywords
~Additive manufacturing; metal-only; millimeter-wave (mm-wave); reflectarray antenna; tri-band/broadband achromatic
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This study demonstrates the use of additively manufactured metal-only waveguide-based tri-band and broadband reflectarray antennas. By adjusting the length of waveguide sections and the position of units, the phase-shifting over triple bands can be controlled independently for beam shaping. Additionally, the sharp selectivity of the waveguide allows for achromatic feature in the reflectarrays.
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.
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