Utilizing the elliptic V-cone antenna ( EVA) as a universal model, when k → 0, the elliptic V-cone antenna retrogresses to a triangular V-plate antenna. The input impedance of the TVA can be derived through the EVA related formulas. 运用具有普遍性的椭圆V-锥天线做模型,当椭圆锥的k值趋于零时,椭圆V-锥天线退化为三角板天线,根据椭圆V-锥天线的有关公式求出了三角板天线的输入阻抗。