| Antennas with frequency independent properties have previously been developed for applications with various polarization requirements. The most commonly used planar apertures are the Archimedean spiral, the logarithmic spiral, the circular sinuous and the circular log-periodic. Four-arm, self-complementary and related growth-rate versions of each type are simulated using CST Microwave Studio. The objective is to study and describe the ability of each antenna to radiate efficiently in multimodal configurations. Through simulation, magnetic field surface plots illustrate the active regions and modal return loss confirms the bandwidth. Comparisons are made between the radiation pattern magnitude and phase ripple, polarization and active regions. |
