Fluidically Reconfigurable SIW Based Self-Diplexing Antenna for Sub-6 GHz band Applications

This work describes a frequency switchable SIW based self-diplexing antenna (SDA) whose both bands can be controlled independently. Two orthogonal microstrip feed lines are employed to simulate the SIW resonator at two separate frequencies in the full-wave EM simulator (HFSS). Air-filled pockets are incorporated into the substrate to tune the antenna resonance frequency. The resonant frequencies can be independently tuned by changing the volume of the liquid-filled in each pocket. Simulated results show that the proposed antenna can be tuned from 3.56 to 4 and 4.4 to 5.05 GHz in the lower and higher frequency bands, respectively. The proposed antenna has peak gains of 5.04 dBi and 5.65 dBi with distilled water filled pockets. This antenna model has a simple design, good isolation, and reconfigurability compared to previous designs, which meets the growing need for RF device simplification and integration in WLAN, INSAT, and cable-free FOR3 applications.