Crossed T DRA antenna

Image of the Crossed T DRA antenna.

DRA antennas are popular due to high radiation efficiency, low weight and small size. This particular cross-T-shaped DRA is fed using a conformal inverted-trapezoidal patch etched on one side of the lower part of the dielectric. The antenna is excited by a microstrip feed line as shown in the following image.

The feed detail of the Cross-T dielectric resonator antenna.

The impedance bandwidth of the antenna increases with the number of arms. Although the fourth has a lesser effect, it has the advantage of making the structure more symmetrical for improved pattern stability The following graph shows impedance vs frequency for different numbers of arms. The second image shows how the 3D gain patterns change with frequency.

Crossed DRA input impedance vs frequency for a different number of arms.
Typical total gain patterns at the minimum, centre and maximum design frequencies.