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.