This letter proposed a codesign of array-antenna decoupling surface (ADS) and crisscross-shaped dipole antenna (CSDA), with a wide low-band (LB) working bandwidth from 1.7 to 2.4 GHz and a wide high-band (HB) decoupling bandwidth from 3.3 to 4.2 GHz. The CSDA is electromagnetic transparent by introducing interdigital capacitors and high-impedance line, and operating together with four square parasitic units to form a wide LB bandwidth. For the HB antenna array, the spatial distance between each element is only 43 mm in x - and y -axes. The severe in-band coupling is suppressed by the combination of four units and a dielectric radome, acting as dual-layer ADS. With the codesign of ADS and CSDA, the mutual in-band and cross-band coupling is highly suppressed, which is valuable for dual-band antenna array decoupling.