A six-band reflectarray antenna

Prospective Applications of Microwave Reflectarray Antennas to the Design and Fabrication of Future Radio Telescopes

“…The specific technique to achieve multi-band performance depends on the number of frequency bands and their frequency ratios. Several multiband reflectarray prototypes, without beam scanning capabilities, have been realized, combining up to six different frequency bands, mostly in the range from C-band to Ka-band [18]. Current research in this specific area is focusing on designing unit cells that minimize the mutual coupling effects between the elements at all frequency bands.…”

Dual polarized reflectarray antenna for operation in X and Ku bands

“…[3][4][5][6][7][8][9] On the other hand, a stacked configuration is used where each layer works at different frequencies. [10][11][12][13][14] For the first case, the mutual coupling of different resonant elements affects the antenna performance due to the limited space, which increases the complexity of the design. For example, a novel element composed of I-shaped dipole and circular ring was presented in Qu et al, 4 which operated at two closely separated bands with same polarization.…”

“…A dual-layer element consists of cross dipoles on the higher layer for X-band and square patches on the lower layer for Ka-band in Oh. 11 It was noted that the period of the cross dipoles was twice the square patches, which operated at different frequency bands. Using an FSS as band separator at the middle of double-layer elements is the third case.…”

“…On one hand, various resonant elements are printed on a single‐layer substrate 3–9 . On the other hand, a stacked configuration is used where each layer works at different frequencies 10–14 . For the first case, the mutual coupling of different resonant elements affects the antenna performance due to the limited space, which increases the complexity of the design.…”

“…The second scenario is just the opposite case of the one. A dual‐layer element consists of cross dipoles on the higher layer for X‐band and square patches on the lower layer for Ka‐band in Oh 11 . It was noted that the period of the cross dipoles was twice the square patches, which operated at different frequency bands.…”