不同夹角V型蝶形天线性能比较

A performance comparison of V-shaped bow-tie antennae

采用基于RWG(rao wilton glisson)边元建模、RWG基函数的矩量法求解蝶形天线表面电流,得到天线的性能参数,比较分析了天线两臂夹角分别在30°、45°、60°、90°、180°(平面结构)时,频带在25 MHz^4 GHz内天线的输入阻抗、反射系数、增益、辐射功率及方向性。分析可知:夹角越小,频带辐射功率越大,高频比低频更能有效辐射,方向性略有增强;平面结构天线性能参数在频带内变化更平稳,更有利于低频带的辐射。

The surfaces current of V-shaped bow-tie antennae were solved using method of moment employing the Rao Wilton Glisson （RWG） base function. The performance parameters of antennas subsequently were found. In the band 25 MHz-4 GHz, the input impedance, reflection coefficient, antenna gain, radiated power, and directivity of V-shaped antennae with angles of 30°, 45°, 60°, 90°, and 180° were compared and analyzed. The results indicate that the smaller the angle of antennas is, the greater the radiated power is. High frequency power is radiated more effectively than low frequency power. The directivity of antennas strengthens as the angle decreases. The parameters of planar bow-tie antennae change smoothly which is advantageous for radiation in low frequency bands.