Dual-Band Combined Vibrator-Slot Radiating Structures

Dual-frequency antennas based on vibrator-slot structures with similar radiation patterns in main polarization planes are suggested. Such antennas can be realized by diode switching the activity of slot and vibrator elements. The traditional combined radiators with passive vibrators are proposed to use at the main frequency. The work at alternative frequency is provided by active vibrators. The formation of radiation fields by the combined structures at the main and alternative frequencies is analyzed. It was shown that the main and alternative operating wavelengths should not differ by more than 25%.