The discone antenna′s performance,design principle and the effect of its parameters on the antenna performance are described.Through the introduction of a cone between the plate and the cone below,combining the discone antenna with the biconical antennas,the character of discone antenna remains unchanged.The change of the structure reduces the capacitance between the plate and the cone below,and extends the discone antenna bandwidth.The ANSOFT HFSS software is used to optimize the designed discone antenna b...