Design and Development of BST Ceramics for Microwave Application

ABSTRACT The development of an effective radar absorbent material (RAM) is essential owing to the fast expansion of the satellite, electronic, and telecommunications sectors, particularly in the GHz frequency range. This paper presents a development of Ba 0.5 Sr 0.5 TiO 3 (BST) ceramics, which is high temperature resistance, thermally, and chemically stable electromagnetic interference (EMI) shielding material with absorption dominance. The BST ceramic was synthesized by conventional solid state reaction technique calcined at 1200°C for 4 h and sintered at 1350°C for 4 h. The XRD patterns validated the sample has a single perovskite phase with cubic structure with space group Pm‐3m. The crystallite size (D) and the lattice strain (ε) is calculated to be 115.5 nm and 0.00941. The microwave electromagnetic parameters and shielding effectiveness (SE) is assessed using a vector network analyzer (VNA at the frequency range of 8.2–12.4 GHz (X‐band). The BST ceramics exhibited total shielding effectiveness (SE T ) of value 19.8 dB dominated by absorbance. The minimum reflection loss (RL min ) of −77.4 dB at 8.52 GHz for 1.37 mm thickness of BST shows more than 99.99% microwave absorption. The proposed materials demonstrate considerable reflection loss and an improved absorption spectrum, showing better impedance matching behavior and positioning them as a potential choice for radar‐absorbing compounds in EMI attenuators for electronics equipment, and absorber.