Search

A novel planar monopole antenna for the digital video broadcasting (DVB) signal reception in the UHF band (470-862 MHz) and mobile communications in the GSM850/900 band (824-960 MHz) is presented. The proposed antenna consists of a modified planar monopole and a rectangular ground plane with two planar sleeves. By adjusting the sleeves, a wide bandwidth can be obtained easily. The influence of various parameters on antenna characteristics has been investigated. Simulated and measured results show a wide bandwidth of 735 MHz (465 MHz-1.20 GHz) with the VSWR less than 2.0 and omni-directional radiation properties. Details of the proposed antenna design and experimental results of the constructed prototypes are presented [ABSTRACT FROM AUTHOR]

A new fitness function for the genetic optimization of broadband antennas is proposed. Compared with the previous fitness functions, the one presented in this paper takes not only voltage standing wave ratio and gain but also frequency into consideration. In practical communication system, higher gain needed in the high frequency band of the antenna, so it is more suitable. An impedance matching network for an antenna in 30 MHz to 88 MHz is studied lastly. [ABSTRACT FROM AUTHOR]

A novel swallow-tailed wideband planar monopole antenna with semi-elliptical base is presented. The impedance and radiation properties of the proposed monopole antenna are investigated experimentally. The study indicates that the proposed monopole antenna yields the maximum bandwidth from 1.22 GHz to more than 15 GHz for VSWR<2 with the optimum ellipticity ratio of the antenna's semi-elliptical base and the height of the feeding post. The radiation performance is also discussed and shown to be acceptable over a wide frequency range. [ABSTRACT FROM AUTHOR]