【Abstract】The radiation characteristics of the finite length V-cone antenna are analyzed by the pattern matching method, and the radiation pattern of the antenna is given. By reasonably partitioning the space around the antenna and using the radiation field formula of the existing infinite length V-cone antenna, the field expansion formula of each partition is obtained, and the expansion coefficient is determined by the continuity condition of the field component at the partition interface, thereby obtaining the analytical expression of the far-field radiation field. The calculation results are very consistent with the simulation results, which proves that the pattern matching method is very successful in analyzing the radiation characteristics of the finite length V-cone antenna. This result has a reference significance for the analysis of non-axisymmetric antennas and the engineering design of V-cone antennas. Keywords ultra-wideband; V-conical antenna; mode matching; triangle plate antennaUsing mode match matching, the paper at first time analyses the radiation fields of the V-conical antennas with finite length for the first time. This approach is facilitated by dividing the space into two subregions reasonably, thus allowing use of spherical harmonic expansions in each subregion.The expansion coefficients are found by enforcing the continuity condition at the region boundary surface. The methods leads to very good agreements between the theoretical results and the simulated results,which is given by Ansoft HFSS 8.0.The conclusions. of this paper can be used for engineering design of V conical antennas.
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