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Issue link: https://iconnect007.uberflip.com/i/1546580
16 I-CONNECT007 MAGAZINE I SEPTEMBER 2026 A standard CubeSat (nanosatellite) leaves an engineer with almost no room for compromise. A 1U unit is a 10 cm cube; even a 6U or 12U bus measures its budget in grams and cubic centime- ters, not the kilograms and racks available to a tra- ditional satellite. Every wire harness, connector, and mounting bracket is mass and volume that could otherwise carry a sensor, a radio, or extra battery capacity. That pressure is what has pushed flexible printed circuits out of the wiring harness and onto the structure itself, turning the body panels that form a CubeSat's outer skin into functional elec- tronic assemblies. Instead of aluminum panels with cable harnesses routed along their inner face, a growing number of CubeSat programs now build the panel around a flex or rigid-flex circuit. The polyimide substrate is bonded directly to (or laminated onto) the structural panel, carrying power distribution, data buses, and sensor traces across the full face of the spacecraft. The panel stops being passive structure with wiring attached to it and becomes the wiring itself. Why Flex Makes Sense at CubeSat Scale Three constraints make flex circuits a natural fit for this role. 1. Mass and volume. Discrete wire harnesses require connectors at every junction, strain relief, and routing clearance. A flex circuit integrated into the panel eliminates most of that hardware, replacing bundles of point- to-point wiring with a single, thin, conformal layer that adds negligible mass. 2. Survivability under launch loads. CubeSats ride to orbit as secondary payloads, often in a Poly-Picosatellite Orbital Deployer (P-POD) BY A N AYA VA R DYA , A M E R I CA N STA N DA R D C I RC U I TS FLEX007 A RT I C L E Flex PCB Body Panels in CubeSats Figure 1: The body panel of a CubeSat.