This paper documents a simple parametric polynomial line-of-sight channel model for 100–450 GHz band. The band comprises two popular beyond fifth generation (B5G) frequency bands, namely, the D band (110–170 GHz) and the low-THz band (around 275–325 GHz). The main focus herein is to derive a simple, compact, and accurate molecular absorption loss model for the 100–450 GHz band. The derived model relies on simple absorption line shape functions that are fitted to the actual response given by complex but exact database approach. The model is also reducible for particular sub-bands within the full range of 100–450 GHz, further simplifying the absorption loss estimate. The proposed model is shown to be very accurate by benchmarking it against the exact response and the similar models given by International Telecommunication Union Radio Communication Sector. The loss is shown to be within ±2 dBs from the exact response for one kilometer link in highly humid environment. Therefore, its accuracy is even much better in the case of usually considered shorter range future B5G wireless systems.

本文介绍了适用于100–450 GHz频带的简单参数多项式视线通道模型。该频段包括两个超越第五代（B5G）的流行频段，即D频段（110–170 GHz）和低THz频段（大约275–325 GHz）。本文的主要重点是为100–450 GHz频带推导简单，紧凑和准确的分子吸收损失模型。导出的模型依赖于简单的吸收线形状函数，这些函数适合复杂但精确的数据库方法给出的实际响应。对于整个100–450 GHz范围内的特定子带，该模型也是可简化的，从而进一步简化了吸收损耗的估算。通过将其与准确响应和国际电信联盟无线电通信部门给出的类似模型进行基准比较，表明所提议的模型非常准确。在高度潮湿的环境中，与一公里链路的准确响应相比，损耗显示在±2 dBs以内。因此，在通常被认为是短距离的未来B5G无线系统的情况下，其准确性甚至更高。