Frequency Band Rejection Technique Based on the Operating Modes for a Wideband H-Shaped DRA
Keywords:Dielectric Resonator Antenna (DRA), H-shaped antenna, modes distribution, notch rejection
In this paper, a new approach to create frequency band rejection is applied to a wideband Hshaped dielectric resonator antenna (DRA). In order to create a notch characteristic in the operating band of the TEy1δ1 and TEy2δ1 modes, and guided by their theoretical and simulated electric field distributions, a narrow conductive strip is incorporated around the mid-section of the H-shaped DRA. The orientation of the notching strip is determined based on the electric field distribution of the selected modes for the frequency rejection. Furthermore, the selected feeding method improves the radiation patterns for this DRA shape compared to its previous designs. The new design offers an operating frequency range that extends from 4.15 to 9.8 GHz, allowing 81% of fractional bandwidth. The first notch is created at 6.5 GHz, while the second one is at 8 GHz. Average radiation efficiency of 95% across the frequency of interest is achieved with overall dimensions of 40×30×11.4 mm³. The proposed design is simulated using Ansys HFSS and validated by measurement.
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