Design, fabrication and verification of high temperature frequency selective radome based on integrated co-fired AlN ceramic

Abstract Recently, we have witnessed a surge in attention toward manipulating electromagnetic (EM) waves at high temperature (HT) through the combination of meta-structure and high temperature resistant (HTR) ceramics. Especially for HT radome, tailoring the selective frequency has attracted significant interest. However, means of realization are still in its infancy, which couldn’t maintain the EM stability in a consistent HT environment. Herein, we proposed and demonstrated a potential scheme for HT transmission. To tailor the operating frequency, a frequency selective metasurface (FSM) is utilized to manipulate the bandpass and bandstop through combination of HTR ceramic and metal. To protect conductivity of metal, sandwich structure is utilized to encapsulate the metal within the ceramic, which is fabricated by high temperature co-fired (HTCC). As demonstrations, tungsten and ceramic AlN are utilized to design the frequency selective radome with service temperature 900 °C. Both simulation and experiment show the proposed radome achieves over -1dB transmission from 9.8 GHz to 11.2 GHz in wide range of room temperature to 900 °C. Significantly, this scheme promotes the design and fabrication of HTR metasurface, which is promising to be applied to HTR radome, antenna in aerospace field.