Reconfigurable Impedance Matching Network for 5G Mid-Band Utilizing Phase-Change Materials

In this paper, we present a phase-change, monolithically integrated reconfigurable impedance matching network (IMN) for the 5G mid-band. The IMN features an innovative design with 4-bit phase-change capacitor banks seamlessly integrated within the ground planes of co-planar waveguides (CPW), enabling compactness and high capacitance tuning range. The reconfigurable capacitors are controlled by miniaturized and integrated capacitor bank bits situated on both sides of the CPW. The fabricated device demonstrates a capacitance tuning range of 0.2 to 2.5pF, with a high Q-factor and no self-resonance up to 7GHz. The RF performance of the phase-change switches shows a loss of less than 0.2dB and an isolation greater than 30dB across a frequency range of 2 to 7GHz. The proposed reconfigurable IMN offers promising potential for adaptive and efficient radio frequency (RF) front-ends in modern wireless communication systems.