In this paper, we investigate the loss caused by multiple humans blocking millimeter wave frequencies. We model human blockers as absorbing screens of infinite height with two knife-edges, We take a physical optics ap...In this paper, we investigate the loss caused by multiple humans blocking millimeter wave frequencies. We model human blockers as absorbing screens of infinite height with two knife-edges, We take a physical optics approach to computing the diffraction around the absorbing screens, This approach differs to the geometric optics approach described in much of the literature. The blocking model is validated by measuring the gain from multiple-human blocking configurations on an indoor link. The blocking gains predicted using Piazzi ＇ s numerical integration method （a physical optics method） agree well with measurements taken from approximately 2.7 dB to -50 dB. Thereofre, this model is suitable for real human blockers, The mean prediction error for the method is approximately -1.2 dB, and the standard deviation is approximately 5 dB.展开更多
文摘In this paper, we investigate the loss caused by multiple humans blocking millimeter wave frequencies. We model human blockers as absorbing screens of infinite height with two knife-edges, We take a physical optics approach to computing the diffraction around the absorbing screens, This approach differs to the geometric optics approach described in much of the literature. The blocking model is validated by measuring the gain from multiple-human blocking configurations on an indoor link. The blocking gains predicted using Piazzi ＇ s numerical integration method （a physical optics method） agree well with measurements taken from approximately 2.7 dB to -50 dB. Thereofre, this model is suitable for real human blockers, The mean prediction error for the method is approximately -1.2 dB, and the standard deviation is approximately 5 dB.
文摘功率放大器PA(Power Amplifier)是射频前端重要的模块,基于SMIC 55 nm RF CMOS工艺,设计了一款60 GHz两级差分功率放大器。针对毫米波频段下,硅基CMOS晶体管栅漏电容(C_(gd))严重影响放大器的增益和稳定性的问题,采用交叉耦合电容中和技术抵消C_(gd)影响。通过优化级间匹配网络和有源器件参数,提高了功率放大器的输出功率,增益和效率。后仿结果显示,在1.2 V的供电电压下,工作在60 GHz的功率放大器饱和输出功率为11.3 d Bm,功率增益为16.2 d B,功率附加效率为17.0%,功耗为62 m W。芯片面积380μm×570μm。
