[C-12] Integrated Circuit and Devices

11:15 AM - 11:30 AM JST(2:15 AM - 2:30 AM UTC)

[C-12-20] A Ka-Band Time-Division Multi-Stream Phased-Array Transmitter
with Built-in Spatial Notch Generation for 6G MIMO

〇MINZHE TANG¹, Ziyuan Ren¹, Yuxuan Liu¹, Minghao Fan¹, Dongfan Xu¹, Haiyun Gu¹, Yuncheng Zhang¹, Yamazaki Yudai¹, Sena Kato¹, Hiroyuki Sakai¹, Kazuaki Kunihiro¹, Kenichi Okada¹ (1. Institute of Science Tokyo)

Keywords:

time-division,spatial notch generation,phased-array,Ka-band,MIMO,6G

This work presents a Ka-band time-division (TD) phased-array MIMO transmitter with built-in spatial notch generation for 6G multi-stream transmission. By reusing four RF paths through time-domain beam switching, the proposed architecture enables RF-path sharing and stream coexistence with reduced hardware overhead. The same vector-modulator switching operation is further used for notch steering, suppressing sidelobe leakage without additional analog cancellation paths. A prototype transmitter verifies two-stream OTA operation with 400-MS/s 64-QAM OFDMA signals. The proposed notch steering achieves 20-dB interference suppression and recovers Stream-1 demodulation with −24.2-dB EVM.