Image NRD Guide-Fed Dielectric Rod Antenna for Millimeter-Wave Applications(Antennas, Circuits and Receivers)(<Special Section>Wave Technologies for Wireless and Optical Communications)

概要

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An image NRD guide-fed dielectric rod antenna, which is suitable for use at millimeter-wave frequencies, is presented in this paper. The antenna is composed of a linearly tapered dielectric rod connected to the image NRD guide. First, radiation characteristics of the dielectric rod antenna directly protruded from the end of the image NRD guide are investigated by FDTD analysis and measurements at 30 GHz band. For this case, the degradation of the radiation pattern and the decrease of the gain, which are due to the strong radiation from the guide-to-antenna discontinuity, are observed. In order to minimize this radiation and to realize reasonable radiation characteristics, a transition from the image NRD guide-to-rod antennais proposed. A simple procedure to determine the optimum dimensions of the transition is described. This procedure is based on parametric study of the transition's dimensions, and is performed using FDTD analysis. Based on the results, the dielectric rod antenna having a length of 10 λ_0 is designed, and its performance is analyzed and measured. The results show that radiation patterns with the half power beam width of 22°, sidelobe level of -21dB and reasonable gain of 18.5dBi can be realized by employing the transition having the optimum dimensions.
社団法人電子情報通信学会の論文
2004-09-01