Flexible Focalization: An Addititively Manufactured, Conformal, Low-Profile Multilayer Transmitarray for Space-Based 5G/MM Wave Applications

For the first time, a 28 GHz additively manufactured multilayer flexible transmitarray (TA) system is introduced, utilizing inkjet printing on thin, flexible Polyethylene Terephthalate (PET) substrates. The <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$5.4 \times 5.4 ~\text{cm}$</tex> TA achieves <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\pm 28^{\circ}$</tex> 3 dB angular coverage in two axes, a solid angular coverage of 0.45 sr, and a peak gain of 15.3 dBi, all within a compact 2.6 cm thickness. Flexibility tests under varying bend radii demonstrate robust performance for conformal applications. This scalable, low-cost design sets the stage for large-area, inkjet printed flexible RF/mmWave modules. By leveraging additive manufacturing, this lightweight, ultra-low form factor TA system represents a crucial innovation in integration of TAs with space-based 5 G communication architectures.