  The uncrewed aerial systems industry is rapidly expanding due to advancements
in smaller electronics, smarter sensors, advanced flight controllers, and
embedded perception modules leveraging artificial intelligence. These
technological progress have opened new indoor applications for UAS, including
warehouse inventory management, security inspections of public spaces and
facilities, and underground exploration. Despite the innovative designs from
UAS manufacturers, there are no existing standards to ensure UAS and human
safety in these environments. This study explores developing and evaluating
micro-lattice structures for impact resistance in lightweight UAS. We examine
patch designs using Face-Centered Cubic (FCC), Diamond (D), Kelvin (K), and
Gyroid (GY) patterns and detail the processes for creating samples for impact
and compression tests, including manufacturing and testing protocols.
  Our evaluation includes compression and impact tests to assess structural
behavior, revealing the influence of geometry, compactness, and material
properties. Diamond and Kelvin patterns were particularly effective in load
distribution and energy absorption over the compression tests. Impact tests
demonstrated significant differences in response between flexible and rigid
materials, with flexible patches exhibiting superior energy dissipation and
structural integrity under dynamic loading.
  The study provides a detailed analysis of specific energy absorption (SEA)
and efficiency, offering insights into optimal micro-lattice structure designs
for impact resistance in lightweight UAS applications.
