Two techniques are implemented to improve the impedance matching and the bandwidth of ultrawideband (UWB) rectangular stacked dielectric resonator antennas (DRAs), making them more reliable for FCC UWB application.Cutting a groove on the bottom side of the dielectric resonator can improve the impedance matching within the UWB bandwidth, whereas a square metallic patch connected to a coaxial probe to excite the DRA can extend the entire UWB. Applying the two techniques together to the rectangular stacked DRA can both improve the impedance matching and the bandwidth, without compromising any performance. Theoretical and experimental verification for the two techniques are conducted. A prototype antenna that has a dielectric volume of 12 × 8 × 14.9 mm 3 (or 0.124λ × 0.083λ × 0.152λ at 3.1 GHz) achieves a |S 11| < -10 dB bandwidth of 111.2%, covering the entire FCC UWB bandwidth (3.1-10.6 GHz, 1:3.4 or 109.5%), and an average measured gain of 6 dBi over the band.
- dielectric resonator antenna
- stacked antenna