Reconfigurable Antennas and RF Components at Millimeter Wave
Reconfigurability is a vital feature of future agile millimeter wave systems for sensing, imaging, wireless, and satellite communications. Reconfigurable antennas are an integral part of such systems as they can control polarization, frequency, radiation pattern, or characteristic impedance.
High-Q Variable Capacitors
In our recent work we have developed novel low-loss (high Q) variable capacitors using paraffin phase change material (PCM). These capacitors are designed to operate at 80-120 GHz while exhibiting low losses compared to other technologies (MEMS switches, diodes, FETs). The variable capacitors can be integrated on various platforms such as antennas (see the next section).
Novel Reconfigurable Antennas at 100 GHz
Current reconfigurable antennas suffer from large losses induced by tunable components. In our recent work we have addresses this shortcoming by integrating low-loss variable capacitors onto a slot antenna. Figure below (L) shows a continuously-reconfigurable slot antenna operating at 92-98 GHz.
© Prof. Nima Ghalichechian's Group
Related Paper: B. Ghassemiparvin and N. Ghalichechian, “Reconfigurable Millimeter-wave Antennas using Paraffin-Based MEMS Capacitors,” European Conference on Antennas and Propagation (EuCAP), Davos, Switzerland, April 10-15, 20. (Download PDF)