A novel compact dual band-notched dielectric resonator antenna (DRA) for ultrawideband (UWB) applications is proposed. Here, the bandwidth enhancement and the first band notch is realized by embedding a stub that is located to the hollow center of a U-shaped feedline simultaneously. By etching an inverted T-shaped parasitic strip at the back plane of an antenna that is surrounded by a dielectric resonator (DR), the second band rejection is created. By cutting a slot at the proper position on the ground plane, the width of the second band notch is controlled. The proposed antenna size is mm or about at 3.1 GHz. The measurement results demonstrate that the proposed DRA provides acceptable radiation performances such as an ultra-wide impedance bandwidth of around 122% with two sufficient band rejections in the frequency bands of 3.22-4.06 and 4.84-5.96 GHz, high radiation efficiency, and nearly constant gain.Index Terms-Band-notched, compact, dielectric resonator antenna (DRA), ultrawideband (UWB) antenna.

A compact frequency reconfigurable dielectric resonator antenna (DRA) for LTE/WWAN and WLAN applications is investigated and presented. The proposed antenna provides the frequency tuning between 1.60 GHz and 2.71 GHz. The design consists of four identical rectangular dielectric resonators with permittivity of 10 each and three PIN diode switches which are located on the feed line network between each two dielectric resonators. The proposed antenna size is 20 × 36 × 5.57 mm3 that is suitable for mobile devices. The measurement and simulation results are applied to demonstrate the performance of the proposed antenna. From the measured results, it is found that the proposed antenna with acceptable performance provides four single band modes with the impedance bandwidth of 17%, 11%, 14 % and 6%. Index Terms-Dielectric resonator antenna (DRA), reconfigurable antenna, PIN diode.

A new geometry of compact wideband/dual-band circularly polarised dielectric resonator antenna (DRA) is presented. First, a wideband DRA is realised by a rectangular dielectric resonator excited by a vertical coaxial probe feed which is supported by a small substrate. Circular polarisation is achieved by utilising a configuration of the DRA feed that excites orthogonal modes inside the DRA. A 3 dB axial-ratio bandwidth of about 20.8% (9.05-11.14 GHz) is achieved. Second, extension to dual-band circularly polarised operation is then realised by additionally removing a corner of the rectangular DRA at 45°and adding a floating parasitic strip. The experimental results demonstrate an impedance bandwidth of about 59.8% (6.57-12.18 GHz) and the dual 3 dB axial-ratio bandwidths of about 10.6% (8.31-9.24 GHz) and 13.5% (10.18-11.66 GHz). The measured peak gain varies from 4.47 to 4.86 dBiC in the lower band and 4.33 to 4.91 dBiC in the upper band.

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