Characteristics of H-shaped fractal antenna having VOx absorber for multi-band microbolometer

The absorption spectrum of H-shaped fractal antenna with a gap at the center of the antenna and VO_x layer formed on the gap for multi-band microbolometer was compared with that of it without the gap and VO_x layer. At room temperature, simulation and measurement results for the characteristics of H-shaped fractal antenna with a gap and VO_x layer have been showed that only one resonant wavelength has been observed due to the low conductivity of VO_x layer. On the other hand, at 90°C, due to the resistance and the relative permittivity variation of VO_x layer, we could have obtained two absorption peaks by the simulation. Although one of two resonant wavelengths has been shifted, we could have confirmed the multi-band characteristics of our H-shaped fractal antenna having VO_x layer for the application to microbolometer.