The Space-Time Coding Array (STCA) transmits identical waveforms cyclically with incremental time delays across elements. This architecture offers a computationally efficient solution for achieving full angular coverage while maintaining consistent gain performance. However, radar systems exhibit an inherent trade-off between resolution and angular coverage. To address this limitation, this paper proposes a novel hybrid approach integrating STCA with subarray techniques. By precisely modulating the time delays, the proposed method enables controlled beam scanning, thereby achieving periodic sector scanning within a single pulse duration. Additionally, an additional phase shifter is incorporated at the transmitter to preset the initial scanning position toward the region of interest. The transmit beampattern response and the ambiguity function are studied as an evaluation criterion numerical. Numerical results demonstrate the superiority of the proposed subarray-based STC in both sidelobe level reduction and resolution enhancement within the specified angular range.