High-speed multi-probe spherical near-field (SNF) systems for 5G over-the-air measurement must route dual-polarized probe signals between two sub-systems: an in-house receiver for total radiated power (TRP) measurement and a commercial instrument for ...
High-speed multi-probe spherical near-field (SNF) systems for 5G over-the-air measurement must route dual-polarized probe signals between two sub-systems: an in-house receiver for total radiated power (TRP) measurement and a commercial instrument for out-of-band spurious measurement. This thesis proposes a fully integrated 3–18 GHz 2P3T switch module that provides the three signal paths required for this routing, which conventional switch configurations cannot offer in a single module. Using three SPDT chips, the module realizes two operating modes—delivering either polarization to the commercial instrument (Mode 1) or both polarizations to the in-house receiver (Mode 2)—with a CPWG structure for stable wideband transmission. The fabricated module showed an insertion loss within 7.2 dB, a return loss better than 8.2 dB, and an isolation of about 20 dB over 3–18 GHz. Controlled through a LabVIEW-based program and a TCP/IP relay device, the module enables simultaneous path switching across the system, and eleven identical modules were fabricated and integrated beneath the probes of a multi-probe SNF system. These results confirm that the proposed 2P3T switch module is suitable for 5G antenna performance evaluation in hybrid multi-probe spherical near-field measurement systems.