Analysis of two-arm conical log-spiral antennas using FE-BI method

Radiation properties of two-arm conical log-spiral antennas (CLSA) are analyzed by using the finite element and boundary integral equation hybrid method (FE-BI) in the paper. Firstly the radiation performances of the CLSA with same structure parameters and different frequencies are simulated. Then the impacts of wrap angle and cone angle on radiation properties are calculated in detail. Simulated results show that the geometry parameters of a CLSA greatly affect its radiation properties, but for the same geometry parameters, CLSA possess wider frequency band. Therefore structure parameters should be carefully optimized in practical applications.