Study on Electromagnetic Performance of La 0.5 Sr 0.5 CoO 3 /Al 2 O 3 Ceramic with Metal Periodic Structure at X-Band.

A radar absorbing material (RAM) is designed by combining the La 0.5 Sr 0.5 CoO 3 /Al 2 O 3 ceramic and the metal periodic structure. The phase constitution and the microscopic morphology of the La 0.5 Sr 0.5 CoO 3 /Al 2 O 3 ceramic are examined, respectively. The electrical properties and magnetic properties of the La 0.5 Sr 0.5 CoO 3 /Al 2 O 3 ceramic are also measured at the temperature range of 25~500 °C. Based on the experimental and simulation results, the changes in the reflection loss along with the structure parameters of RAM are analyzed at 500 °C. The analytical results show that the absorption property of the RAM increases with the increase in the temperature. When the thickness of the La 0.5 Sr 0.5 CoO 3 /Al 2 O 3 ceramic is 1.5 mm, a reflection loss <-10 dB can be obtained in the frequency range from approximately 8.2 to 16 GHz. More than 90% microwave energy can be consumed in the RAM, which may be applied in the high temperature environment.