A Digitally Reconfigurable Quasi-Yagi Antenna Enabled by Direct Spatial Antenna Modulation

This paper presents a quasi-Yagi antenna direct antenna modulation (DAM) for wideband digitally controlled phase modulation. A compact transistor-based switching network, driven by two DC bias voltages, enables dynamic feed direction control, achieving 180& far-field phase shifts over a wide frequency range. A 1D array of four DAM elements is fabricated and measured, showing strong agreement with simulations and effective beam steering across multiple digital states, within 1-GHz bandwidth covering the Wi-Fi 6E frequency range. The proposed quasi-Yagi DAM features low complexity and wideband digital reconfigurability, offering a promising solution for future 6G wireless communication and Internet-of-Things (IoT) applications.