Frequency Reconfigurable Millimeter Wave Antenna Integrating Ferroelectric Interdigitated Capacitors

We present the design and the simulation of a frequency reconfigurable millimeter waves patch antenna integrating ferroelectric interdigitated capacitors (FIDCs) based on BST (Barium Strontium Titanate) thin films. The capacitors are designed to operate up to 65 GHz, offering tunabilities of the order of 40% for a 100 V bias voltage and with relatively low losses. To ensure maximum frequency agility, FIDC devices are specifically designed and integrated into the excitation circuit of a patch antenna. The DC voltage bias applied on the FIDCs modifies their capacitance values and thus shifts continuously the operating frequency of the antenna, from 26.7 GHz to 31.2 GHz (16.85% frequency agility).