Due to large reflection and diffraction losses in the THz band, it is arguable to achieve reliable links in the none-line-of-sight (NLoS) cases. Intelligent reflecting surfaces, although are expected to solve the blockage problem and enhance the system connectivity, suffer from fabrication difficulty and operation complexity. In this work, non-intelligent reflecting surfaces (NIRS), which are simply made of costless metal foils and have no signal configuration capability, are adopted to enhance the signal strength and coverage in the THz band. Channel measurements are conducted in typical indoor scenarios at 306-321 GHz and 356-371 GHz bands to validate the effectiveness of the NIRS. Results measured with NIRS in different sizes show that large NIRS performs much better than small NIRS. Furthermore, by invoking the NIRS, the additional reflection loss can be reduced by more than 10~dB and the coverage ratio is increased by up to 39$\%$ for a 10~dB signal-to-noise ratio (SNR) threshold.

翻译：由于太赫兹频段存在较大的反射和衍射损耗，在非视距场景下实现可靠链路颇具挑战性。智能反射表面虽有望解决遮挡问题并增强系统连通性，但其制造困难且操作复杂。本研究采用由低成本金属箔简单制成、不具备信号配置能力的非智能反射表面来增强太赫兹频段的信号强度与覆盖范围。在306-321 GHz和356-371 GHz频段针对典型室内场景开展信道测量，以验证NIRS的有效性。不同尺寸NIRS的测量结果表明，大型NIRS的性能显著优于小型NIRS。进一步研究表明，通过引入NIRS，额外反射损耗可降低10 dB以上，且在信噪比阈值为10 dB时覆盖比例提升高达39%。