In military and aerospace systems, thin film patterned substrates literally serve as the foundation of some of the most critical electronic assemblies, including RF, microwave, millimeter wave, and high-speed digital circuits.
These substrates are typically made by depositing extremely thin layers of conductive and dielectric materials on bases built from materials like alumina, aluminum nitride, quartz, or certain high-performance titanates with various dielectric constants up to a k of 4000.
The goal: to create precise, stable electrical pathways that improve electrical performance and increase reliability even under extreme conditions such as rapid temperature fluctuations, high vibration, exposure to radiation, and long mission lifetimes where maintenance is impossible.
This level of precision is essential for electronics embedded in low earth orbit (LEO) satellites, drones, spaceborne communications, radar payloads, navigation systems, and signal-processing electronics.
Compared to thick film or regular printed circuit boards, thin film technology allows for extremely fine detail, often with lines and spaces just a few microns wide, which helps ensure electrical performance is consistent from one part to the next.
With accurate conductor line widths and spacing, designers can control the characteristic impedance of transmission lines, coupling between RF traces, and even manage thermal loads within RF circuits.
At high frequencies, even a small change in the width of a circuit trace can affect impedance or detune a filter, so this level of control is critical. It also makes it possible to fit more circuitry into a smaller space while keeping unwanted electrical effects to a minimum.
“Functionally, thin film substrates provide the stable, high-precision electrical platform on which critical aerospace and military electronics are built. They allow complex circuits to be integrated in ways that minimize signal loss, maintain phase coherence, and reduce noise—attributes that directly impact range, clarity, and security of communications, as well as the resolution and accuracy of sensing systems,” says Scott Horton of Johanson Technology.
For more than 60 Years, Johanson Technology of Camarillo, Calif. has designed and manufactured passive components and substrates including thin-film circuits, multi-layer ceramic capacitors, EMI filters, and other critical components for high reliability applications.
Compared to commercial RF substrates, those for military and aerospace are manufactured to tighter dimensional tolerances and undergo more extensive screening. This includes controlling the dielectric constant, measuring conductor thickness with micron precision, and stress testing for vibration, shock, and thermal cycling.
High-purity gold, platinum, or other noble metals are often used for conductors to ensure low resistive loss, corrosion resistance, and consistent performance over decades. The dielectric layers are also applied with precise thickness control to achieve exact impedance targets and reduce parasitics, which is critical for multi-gigahertz wireless operation.
Across all these military and aerospace applications, thin-film patterned substrates are designed and can be screened to the highest-level reliability standards, such as MIL-PRF-38534 for hybrid microcircuits and MIL-STD-883 for environmental and mechanical stress testing.
For more information, contact Johanson Technology at (805) 389-1166, visit web site: https://www.johansontechnology.com/ppr/military-aerospace/ or e-mail: kvilla@johansontechnology.com. The company is located at 4001 Calle Tecate, Camarillo, CA 93012.