# Evolved Antenna **Domain:** Evolutionary Computation / Aerospace Hardware **Doc Type:** Canonical Artifact Node **Maturity:** Developed ## Definition The **evolved antenna** was an unconventional X-band antenna design produced through evolutionary algorithms for NASA's Space Technology 5 mission and flown on its three spacecraft. ## Architecture The Ames team evaluated populations of candidate geometries against mission constraints. One representation used real-valued parameters without branching; another used tree-structured genetic programming that allowed branches. High-performing designs were fabricated and tested. The peer-reviewed project account describes the evolved prototypes as comparable to a hand-designed contractor antenna and as human-competitive. After mission requirements changed, a compliant design was evolved and qualified on a compressed schedule. ## Nexus Context [[articles/The Evolutionary Roots of Silicon Valley|The Evolutionary Roots of Silicon Valley]] treats the artifact as natural selection's formal structure becoming manufacturing practice. The algorithm did not remove designers: humans defined representation, fitness, simulation, fabrication and acceptance tests. ## Key Insight **Evolutionary design can produce forms outside human convention, but the environment encoded by human requirements still determines what counts as fit.** ## Sources / Provenance - NASA Technical Reports Server: https://ntrs.nasa.gov/search.jsp?R=20040152147 - NASA/JPL ST5 antenna record: https://www.jpl.nasa.gov/nmp/st5/TECHNOLOGY/antenna.html ## See Also [[wiki/Genetic Algorithm|Genetic Algorithm]], [[wiki/Genetic Programming|Genetic Programming]], [[wiki/Objective Function|Objective Function]], [[wiki/Design Space|Design Space]]