Compact Dielectric Resonator Antennas With Ultrawide 60%-110% Bandwidth

• Published in: IEEE transactions on antennas and propagation Vol. 59; no. 9; pp. 3445 - 3448
• Main Authors: Yuehe Ge, Esselle, K. P., Bird, T. S.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.09.2011; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Antenna measurements; Antennas; Applied sciences; Bandwidth; Dielectric resonator antenna (DRA); Dielectric resonator antennas; Dielectrics; Exact sciences and technology; FCC; Ground plane; Mathematical analysis; Noise levels; Probes; Radiocommunications; Resonant frequency; Resonators; stacked antenna; Telecommunications; Telecommunications and information theory; Ultra wideband antennas; ultrawideband (UWB); Walls; Conducting wall; Dielectric resonator antenna (DRA); Prototype; Volume; Rectangular resonator; FCC; stacked antenna; ultrawideband (UWB); Dielectric resonator antennas; Permittivity; Ultra wide band
• ISSN: 0018-926X; 1558-2221
• DOI: 10.1109/TAP.2011.2161538

The design of rectangular dielectric resonator antennas (DRA) with ultrawide bandwidths, in the range of 60-110%, is described. The DRA exploits multiple low-Q modes with overlapping bandwidths to achieve a wide contiguous bandwidth. This is achieved using a full-length, low-permittivity inset between a higher permittivity dielectric volume and a ground plane. With the proposed dielectric arrangement and a feed inside DR, it is possible to efficiently couple a sufficient number of such overlapping modes to a 50 Ω feedline. The volume of such DRAs is also reduced by means of a finite planar conducting wall. These advantages led to an example design with a bandwidth that is significantly wide and at the same time has a smaller DR volume than conventional DRAs. A prototype antenna designed to operate in the FCC UWB band from 3.1 to 10.6 GHz has a dielectric volume of 12 × 8 × 15.2 mm 3 (or 1.7 × 10 -3 λ o 3 at 3.1 GHz), and an average measured gain of 5 dB over the band.