Design and Characterization of an IQ Reflection-Type Vector Modulator for Ka-Band Using PIN Diodes. - Raul Arruela; Diogo Marinho Marinho; Tiago Varum; João Nuno Matos (IEEE Access, 2020)

A 3.6 GHz Polar Reflection-Type Vector Modulator Phase Shifter With Amplitude Control Capability. - Raul Arruela; Tiago Varum; João Nuno Matos (IEEE Access, 2023)

A Ka-Band Modular Dual Switchable Circularly Polarized Phased Array Transmitter for LEO Satellite Communications. - Amélia Ramos; Raul Arruela; Bernardo Lopes; Tiago Varum; Ricardo Correia; João Nuno Matos (IEEE Access, 2025)