This letter presents transmission enhancement methods for low-emissivity (low-E) windows at millimeter wavelength (mmWave) frequencies. These methods are required for installation of effective indoor customer premises equipment for mmWave fixed wireless access (FWA) services. Low-pass filtering frequency selective surfaces are patterned with low-E coatings by laser, and the effects are verified theoretically and experimentally. Antireflection (AR) dielectrics are additionally utilized and found to reduce transmission loss in various types of window regardless of frequency and incident angle. The results of the current study achieve lower losses for various types of window and incident angles. A transmission loss improvement is also achieved in a real FWA scenario, which can be applied for the coverage extension of FWA services.

中文翻译：

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5G 毫米波频段低辐射玻璃的传输增强方法

这封信介绍了毫米波 (mmWave) 频率下低辐射 (low-E) 窗口的传输增强方法。为毫米波固定无线接入 (FWA) 服务安装有效的室内客户端设备需要这些方法。低通滤波频率选择表面通过激光​​在低辐射涂层上形成图案，并通过理论和实验验证了效果。此外还使用抗反射 (AR) 电介质，并发现无论频率和入射角如何，都可以减少各种类型窗口中的传输损耗。当前研究的结果对各种类型的窗口和入射角实现了较低的损耗。在真实的FWA场景中也实现了传输损耗的改善，可用于FWA业务的覆盖扩展。