A Passive Crystal-Less Tag Demonstrating Battery-Free GSM-CW/5G-NR Downlink and BLE-to-BLE/BLE-to-WiFi/WiFi-to-WiFi Multi-Channel-Hopping Uplink with Smartphones. - Qijing Xiao; Changgui Yang; Yunshan Zhang; Ziyi Chang; Cheng Chen; Xin Hu; Weixiao Wang; Guangjie Gu; Yuxuan Luo; Bo Zhao 003 (CICC, 2025)