For a polynomial $P(z):=\sum_{j=0}^na_jz^j$ of degree $n$ having all zeros in $|z|\leq 1,$ It is known: $$|P'(z)|\geq \dfrac{1}{2}\Bigg(n+\frac{|a_n|-|a_0|}{|a_n|+|a_0|}\Bigg)|P(z)|.$$ In this paper, besides the generalization of the above inequality, we extend some well-known results to the polar derivative of a polynomial.