Heterogeneously Integrated 6–12 GHz Butler Matrix

A 4x4 Butler matrix designed in a Metal Embedded Chip Assembly (MECA) process is presented. The broadband multi-beam feed network covers 6–12 GHz and is designed to be integrated with a double-ridged horn array. Three individual alumina pieces are integrated in a metal-embedded process using the interconnect layer for the final connections. Simulation results show the expected performance with amplitude imbalance less than 1.5 dB and phase imbalance less than 21° across the 6–12 GHz octave. The resulting radiation patterns using the Butler matrix are shown with steering of 14° and 40° at 6 GHz and 7° and 21° at 12 GHz.