科研之友
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摘要
Designs of 1 x 4 vertically polarized arrays with wide beamwidths are described. The array is composed of two pairs of monopole slot antennas, and each pair is excited with a differential feed scheme to reduce cross polarization. In addition, a rectangular metallic box is introduced as a reflector of the array to generate different beamwidths and improve front-to-back ratios. From the simulated results, it is found that by tuning the dimensions of the metallic box, the H-plane half-power beamwidth of the array can be varied between 90 degrees and 180 degrees. For each beamwidth case, the 10dB-return-loss bandwidth (BW) of the array can cover the band from 1.7 to 2.7 GHz; moreover, a cross polarization of lower than -20 dB, a front-to-back ratio of higher than 15 dB, and a beamwidth variation of <10 degrees are also realized within the impedance BW. An experiment is also carried out to validate the simulation.
- 出版日期2016-12
