engleski

Ultra Wideband Antenna of Two Closely Spaced Triangular Monopoles

To meet the challenging demands of modern radar and wireless communications, such as high speed data transmission and multimedia services, a lot of different ultra wide band (UWB) and multiband antenna topologies have made rapid advances in the past few years. Large impedance bandwidth can be achieved by using the self-complementary property, in which the antenna is identical to its complement. Unfortunately, when the angle of the metallic part is 90 degrees, the input impedance is theoretically equal to one half of the free space intrinsic impedance. Therefore it is very difficult to match such an antenna to the 50 ohm characteristic impedance in a wide frequency band. In this presentation, we propose three novel antennas for UWB radar and base station applications. Conceptually, they are based on the self-complementary principle. Two slightly different topologies with triangular monopoles are presented to improve the impedance matching and the pattern stability across the operating bandwidth from 1 to 5.5 GHz. Therefore, both experimental and computational results of the antennas impedance and radiating properties will be shown. The numerical analysis of the antennas are performed using a commercial computer software package (FEKO), based on the method of moments. The proposed antennas exhibit acceptable UWB performances, good radiation properties, simple construction, and show potential for finding applications in UWB radars, base stations and small terminals.

ultra wideband antenna; monopole antenna; bow-tie antenna

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