Dual band double stacked dielectric resonator antenna with a P-shape parasitic strip for circular polarization

In this paper the A-shape dielectric resonator antenna is modified for circular polarization in low frequencies of wireless applications. In order to have a wide bandwidth, a dielectric with low permittivity is employed. Another dielectric resonator owning a high permittivity is stacked to the other one, which is assigned to provide circular polarization. A Pshape parasitic strip is embedded between the two resonators to guide electrical and magnetic fields for a low axial ratio (AR) over a wide bandwidth. The proposed DRA with good radiation characteristics offers a bandwidth of 34% between 2.90 GHz and 4.11 GHz and an axial ratio of 18%between 3.40 GHz and 4.04GHz for the first band and a bandwidth of 18% between 5.16 GHz and 6.16 GHz for the second band that all support 2.4 GHz Bluetooth, WLAN, 3.3-3.6 GHz (WiMax), 3.8-4.1 GHz (C-band), 4.8-6.2 GHz (5.2, 5.5 & 5.8 GHz-WLAN & WiMax) © 2011 IEEE

Square circular polarized dielectric resonator antenna with a rotated notch

A square dielectric resonator antenna is mounted on the edge of substrate, which is excited simply with a microstrip line. The DRA radiates from both upper and lower side and is optimized to have the maximum surface to volume ratio. For circular polarization, a 45 degree rotated square notch is drilled inside the DRA and the microstrip line is designed to be at the right side of the DRA. A circular magnetic current creates a dramatic low axial ratio for a wide matching rate. The proposed compact DRA antenna showed a good radiation characteristic with an impedance bandwidth of 5.9GHz between 3.9GHz and 9.8GHz and axial ratio of 1.25GHz between 3.9GHz and 5.15GHz and axial ratio of 900MHz between 7GHz and 7.9GHz. The results are numerically investigated with Microwave CST Studio software

A compact circularly polarized and wideband rectangular dielectric resonator antenna

A Rectangular Dielectric Resonator Antenna (RDRA) made of a high permittivity (ε r = 30) ceramic material is presented. It is shown that by selecting the resonator shape and creating a L-shape hole inside the dielectric resonator, it is possible to design RDRA which compact size and wide frequency coverage. The radiation characteristics of the RDRA are broad and stable across a matching band of 3.6 to 9.6 GHz. Also, left hand circular polarization (LHCP) is occurred in the center frequency of 4.3 GHz. The proposed antenna has good radiation characteristics over the operating bandwidth. © 2011 IEEE