Structuring analog fractance circuit for 1/2 order fractional calculus

In the first, the paper analyzes the classical tree type analog fractance circuit for frac12 order fractional calculus. In the second, it puts forward and discusses our three new types analog fractance circuits for frac12 order fractional calculus. It compares the structure and function of our three new type´s fractance with the classical one respectively. It is true that the frac12 order net-grid type analog fractance circuit is the best one of the four types. In the last, it studies some theoretical and engineering problems that need to be deeply researched in the area of the fractional calculus applications to electronic communication and information processing