Phase-controlled metamaterials leverage precisely engineered microstructures to manipulate acoustic wavefronts by tailoring phase delays across unit cells, enabling focused sound energy at desired locations. This chapter presents three acoustic focusing (AF) lens designs addressing key limitations of conventional phased arrays. First, a broadband AF lens composed of six cavity-based meta-atom types achieves a fractional bandwidth of 0.24, overcoming narrowband constraints through unique phase-tuning mechanisms. Second, an ultra-broadband design utilizing V-shaped meta-atoms attains unprecedented fractional bandwidths of 1.12 (8-unit type) and 0.76 (2-unit type), while maintaining robust performance. Third, a flexible metafiber bundle lens (fractional bandwidth 0.2) with tunable focal lengths demonstrates adaptability for cylindrical sources and integrates rigid scatterers for enhanced functionality. These AF lenses overcome traditional challenges of fabrication complexity and bandwidth limitations while enabling applications in medical ultrasound, non-destructive testing, and acoustic energy harvesting. The systems also exhibit potential for direction/waveform conversion, significantly expanding the practical utility of phase-controlled metamaterials in both industrial and biomedical fields.