A nonuniform stub-loaded and coupling-free broadband phaser is proposed as an alternative to conventional coupled-line sections based phasers for enhanced design flexibility, reduced complexity and lower cost in Radio Analog Signal Processing (R-ASP) systems. Nonuniform open- and short-terminated stub-loaded sections are employed to achieve specified highly flexible group delays with flat transmission magnitude responses. The phaser does not require multilayer or wire-bonding technologies since it consists of couplingfree transmission lines. The principle and synthesis procedure of the phaser are presented and two design examples with diverse specifications are presented with theory and full-wave simulation results. The phaser can be realized using microstrip technology and integrate with different lumped components and planar structures.