Frequency Reconfigurable Antenna Based on Substrate Integrated Waveguide for S-Band and C-Band Applications

A novel frequency reconfigurable antenna based on substrate integrated waveguide (SIW) for S-band and C-band applications is proposed. The employs a SIW resonant cavity structure with rectangular-ring slot long slit etched the top surface. An extra via post introduced to adjust resonance of low-frequency mode independently without affecting impedance matching high-frequency or decreasing gain. Several PIN diodes are symmetrically placed along attach patch working state controlled by simplified bias structure. prototype was fabricated measurements show proposed has bandwidth 18 MHz in 322 mode. Good agreements between simulated measured return losses, as well radiation patterns, observed.