Some research needs in metasurface absorbers for lowering radar cross section (RCS) in the terahertz (THz) frequency range are as follows:
- Efficient broadband absorption: Most metasurface absorbers currently have restricted bandwidth and efficiency reduces dramatically beyond their specified frequency. Metasurface absorbers with broad bandwidth and good absorption efficiency require more research.
- Metasurface absorbers with many functions: There is a demand for metasurface absorbers with several functions such as sensing, imaging, and energy harvesting.
- New material solutions are required to provide substantial absorption in the THz frequency band with minimal loss and great stability.
- Integration with other components: There is room for development in the integration of metasurface absorbers with other components such as antennas to produce integrated systems.
- Design for individual applications: Most metasurface absorber designs are currently based on broad concepts and are not optimised for specific uses. More study is required to create metasurface absorbers optimised for certain applications, like as stealth aircraft or spacecraft.
- Large-scale integration: At the moment, it can be challenging to produce metasurface absorbers on a big scale, and more study is needed to address this issue.