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This paper presents a novel design method for improving bandwidth of sleeve antenna. The proposed design method incorporates dual-sleeve structure and end-loaded technology. Two novel sleeve antennas are designed with operation frequency 0.8GHz∼2.7GHz and 3.1GHz∼10.6GHz based on the proposed method. Simulation results show that the antennas have a 3.4∶1 bandwidth with 10-dB return loss and an omnidirectional...
A novel dual-sleeve broadband antenna for 2G/3G/4G mobile communications is presented. By using end-loaded technology the input impedance of the designed antenna is decreased and the bandwidth of the antenna is expanded. The operating frequency of dual-sleeve antenna is 0.8GHz to 2.7GHz, where the voltage standing wave ratio (VSWR) is less than 1.5. A prototype is constructed and tested, which shows...
This paper proposed a dual-sleeve broadband omnidirectional antenna based on end-loaded technology. The input impedance of the designed antenna is reduced due to the end-loaded technology and the special dual-sleeve structure, which effectively increase the bandwidth of the antenna. The operating frequency of the dual-sleeve broadband antenna based on end-loaded technology ranges from 57 MHz to 103...
The novel compact folded Yagi antenna, for its high gain and superiority in small size, is being interested in various electromagnetic application areas. But for its complex structure, as well as the strong coupling among the elements, making the optimization and design rather difficult. In this paper, the impact of multi-scale semi-solutions to the final performance of antenna is taken into account,...
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