Study on radiation performances of dipole antenna with diamond‐structure EBG substrate fabricated by 3D printing technique

摘要

Abstract In order to improve antenna radiation performances, a dipole antenna with 3D diamond‐structure electromagnetic band‐gap ( EBG ) substrate is analyzed and its transmission performances are investigated. The diamond‐structure EBG substrate was fabricated with aluminum oxide ceramic by 3D printing technique and sintering process, and its band‐gap measured by a transmission‐reflection method was between 9 and 11.5 GHz, with a maximal loss of ?50 dB at 9.9 GHz. The radiation frequency of designed dipole antenna corresponded to the frequency of strongest reflection of the EBG s. Comparison of E‐plane radiation patterns of dipole antenna without substrate, dipole antenna with a common ceramic substrate and dipole antenna with EBG s showed that gain of dipole antenna with EBG s was 3 dB higher than that of dipole antenna with a common ceramic substrate and 5 dB higher than that of dipole antenna without substrate, thus the gain was improved by 3.2 times. Moreover, the radiation pattern of dipole antenna with EBG s was smoother, which showed that EBG s can effectively suppress propagation of surface waves. In addition, the main lobe width was reduced, thus antenna directivity was improved.