A broadband dual-polarized omnidirectional antenna based on magnetic dipoles is presented. The proposed antenna consists of a cone radiator for vertical polarization (VP) and eight magnetic dipole elements for horizontal polarization (HP). The dipole elements are arranged around the ground plane to greatly reduce the volume of the proposed antenna. The overall volume of the antenna is only π × 75.5 mm × 75.5 mm × 35 mm (about π × 0.25 λ 0 × 0.25 λ 0 × 0.12 λ 0 at 1 GHz). The dipole elements are carefully designed to achieve the bandwidth about 28.7% from 2.03 GHz to 2.71 GHz. The bandwidth of the cone radiator is about 92% covering from 1 GHz to 2.7 GHz with band reject from 1.63 GHz to 1.7 GHz. The port isolation is more than 30 dB at the whole operation band. A good agreement between the simulated and measured results evidently validates this proposed antenna.

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A compact ultra-wideband (UWB) top-loaded antenna for multiservice wireless applications is presented. It consists of a metal cone radiator, a small ground plane, four shorting poles and a topcross plate, among which the top-cross plate with two slots shorted to the ground planet is important to broaden the low frequency bandwidth. The measured result shows that an improved impedance bandwidth of 185% from 1.17 to 30 GHz is achieved. The omnidirectional stable radiation pattern in the horizontal plane is also obtained. The volume of proposed design is approximately 0.0173λ 3 at 1.17 GHz. With the small volume and UWB characteristic, the design of the proposed antenna is very suitable for many wireless standards such as Softbank (1427-1500 MHz), DCS1800, PCS1900, UMTS, IMT2000, Wi-Fi (2.4 GHz), WiMAX (2.2-5.5 GHz), UWB (3.1-10.6 GHz), and satellite communication (X band, Ku band and Ka band).

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