Özet:

In this article, a new U‐shaped dielectric resonator antenna (DRA) for broadband applications is proposed. The antenna consists of a modified stepped CPW trimmed to excite the U-shaped dielectric resonator with a relative dielectric constant of 10.2. A parasitic strip along the other side of the DRA is joined to the coplanar waveguide structure acts as tuning element for the antenna frequency band.  The proposed antenna is designed using the FR4 substrate of 4.6 relative dielectric constant and 1.6 mm thickness. The antenna is designed, analyzed, and optimized using a full-wave electromagnetic simulator. The results reveal that the proposed DRA has an impedance bandwidth for VSWR<2 from (3.22‐5.92) GHz with 59 % bandwidth efficiency. The antenna operating band covers the IEEE 802.11 and many bands of wireless systems like C-band, 5.2, 5.5 & 5.8 GHz-WLAN and WiMAX. The antenna provides a stable quasi-omnidirectional radiation pattern in the H plane and bidirectional radiation pattern in the E plane with a gain ranging from (2.5- 4.6) dB across the operating bandwidth. The proposed antenna could be also used for lower European UWB frequency band (3.4‐5.0) GHz applications and for medical microwave imaging purposes. The overall dimension of the antenna is 26mm×32mm×1.6mm and the thickness of the dielectric resonator is only 8.12 mm; so, the antenna can be categorized as a compact size and low profile antenna. 

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