## 6 Summary  
Several of the predominant sensors used for SHM are fiber-FBGs that are intermittently carved in FO cables, to transfer EM waves to and from the FBGs. These FBG sensors and FO cables need careful physical packaging but still, they occupy a lion's share of the SHM market, especially for civil infrastructure. On the other hand, non-FO metamaterials such as LSP sensors are highly non-fragile as they are manufactured bi-material composites, with metal or plastic or polymer inscriptions on flexible and ultra-thin materials. They are bendable and twistable that range from linear (\(0^{0}\)) to double bend (\(180^{0}\)) shapes. Additionally, these LSP sensors do not require fragile packaging and can complement FO and FBG sensors in SHM. Additionally, no single smart material or SHM technique can ever address the complexities of CMA structures and fusion of such sensors along with existing sensing techniques is encouraged. The global demand for wired and wireless SHM is on the rise. Popular business strategists such as Technavio analysts, estimated the global SHM market to grow to US$ 3.38 billion in another 5 years, at a CAGR of 17.93%. Especially, the market of metamaterial is expected to grow rapidly at a rate of more than 22% and the market of piezoelectric materials is expected to accelerate at a rate of over 13%. At the same time, the global automation and robotics market in the automotive industry is expected to post a rate close to 8%. Hence, it is foreseeable that fusion of such smart materials with automation will increase the overall market enormously. In this context, this invited review presents several metamaterial designs along with our recent works, especially our new LSP design with portable meta setup and kit. Most of these designs are developed by the physics and electronics groups for sciences and medicine applications. Also, most of the present metamaterial designs have not been tried for CMA engineering structures. If any metamaterial or their breed have to be effective for SHM then their designs and implementation schemes need to be studied by CMA engineering researchers. The sensors need to be ultra-sensitive, portable, and water sealed for robust CMA engineering applications. Researchers are constantly improving their designs to make them suitable for rugged engineering monitoring. CMA and non-CMA researchers need to work closely to develop better designs for harsh environmentengineering applications. Thus, this review paper draws attention to SRR designs of far field setup and LSP designs of near field setup. In the latter part of the paper, we introduced our longitudinal-LSP design to study sensing zone and water content effect. The study demonstrated the importance of exposing metamaterial sensors to the requirements of CMA engineering issues. Furthermore, a novel idea of utilizing the adjacent sensors such as piezoelectric diaphragms of a co-existing SHM technique, as catchment sensors are successfully presented. Finally, a miniaturized Arduino meta setup and kit, which is portable, economical and easy to launch compared to far field and near field is presented. This kit can operate with battery or via a portable computer. The data can be stored or displayed based on the choice of the end user. The user can adapt far field, near field or portable setups based on their requirements. The efficiency of the meta setup and kit depends on the selection of the right operational resistor. High resistance values like 100 k\(\Omega\) are not suitable to monitor the magnitude of the load but are suitable for detecting merely the presence of a load, due to their high sensitivity. On the other hand, low resistance values like 10 \(\Omega\) are not suitable for either detection of the load magnitude or the presence of a load, due to their low sensitivity. However, the difference of the maximum and minimum mean digital output value for the 510 \(\Omega\) and 1 k\(\Omega\) resistor is 418.88 and 515.15 respectively, which is considerably high compared to other resistors.