Based on your search for "Key Technologies Comprehensive Guide," you are likely looking for the 2022 Wiley-IEEE Press book by Wei Jiang and Fa-Long Luo.

Intelligent reflecting surfaces, cell-free massive MIMO, and smart radio networks.

As this is a copyrighted academic publication, it is generally not available as a free legal download in .rar format. However, you can access the content through these legitimate channels: Official Access & Libraries