Author(s)
Zhiyu Shen
Abstract
We present a V-band phased array architecture for LEO satellite communication that maintains link robustness at 52 GHz uplink and 42 GHz downlink while meeting shared‚Äëspectrum constraints on power‚Äëflux density at Earth. Our approach uses a nested refractive Rotman lens in silicon substrate-integrated waveguide to realize true-time-delay beamforming (minimizing beam squint across 42/52 GHz), feeding scalable planar arrays with narrow, well-controlled beams. The lens functions as a compact building block for small subarrays and scales/tiles for larger apertures required by V-band link budgets. Close-coupled ScAlN/GaN LNAs/PAs and ScAlN BAW diplexers integrate at the lens outputs/ports to reduce feed loss impact, enable simultaneous TX/RX, and keep receiver noise low. System studies indicate that downlink operation can be configured to remain within PFD limits while terrestrial Fixed Service receivers experience negligible desensitization-consistent with reference analyses in our project description. The resulting architecture provides a practical path to high-efficiency, policy-compliant V-band arrays using manufacturable unit cells that assemble into larger panels.