Influence of Housings on the Ultra-Wideband Three-Axis Orthogonal Dipole Antennas

The housing has an impact on the performance of the three-axis orthogonal dipole antennas. In this paper, the influence of housings on the three-axis orthogonal dipole antennas is discussed. By comparison of different shapes, materials of housings, it is indicated that the alumina spherical housing does better in improving the antenna performances in the working band. But as the housing size decreases, the metal spherical housing shows even better performance. Moreover, in the high frequency band, respective excitation can achieve higher gains than simultaneous excitation. By studying the effect of the housing, we design an ultra-wideband electric field probe with better performance in the operating frequency band.