Development and characterisation of (Mg, Mn) U-type microwave absorbing materials and its application in radar cross sections reduction

• Published in: IET microwaves, antennas & propagation antennas & propagation, 2014-02, Vol.8 (3), p.165-170
• Main Authors: Padhy, Sankarsan, Sanyal, Subrata, Meena, Ram Swaroop, Chatterjee, Rantamala, Bose, Aniruddha
• Format: Article
• Language: English
• Subjects: Absorbing; Absorption; Applied sciences; Ba4Mg2‐xMnxFe36O60; Circuit properties; Complex permittivity; Computer simulation; Electric, optical and optoelectronic circuits; electromagnetic simulation software; electromagnetic wave absorption; Electronics; Exact sciences and technology; frequency 8 GHz to 10 GHz; hexaferrite pellets; hexaferrite powder; microwave absorbing paint pellets; Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits; microwave materials; Microwaves; network analysers; Pellets; Permeability; permeability values; permittivity; permittivity values; polyimide solution; Projectiles; radar cross‐section reduction simulation; radar cross‐sections; Radiolocalization and radionavigation; Reduction; reflection loss; size 1.7 mm; Telecommunications; Telecommunications and information theory; U‐type microwave absorbing materials; vector network analyser; VNA; X‐band
• ISSN: 1751-8725; 1751-8733; 1751-8733
• DOI: 10.1049/iet-map.2012.0332

The preparation and complex permittivity and permeability measurement of a new U-type of hexaferrite microwave absorbing material (Ba4 Mg2 − x MnxFe36 O60) is reported for different value of x in range 0 ≤ x ≤ 2. Complex permittivity and permeability values of hexaferrite pellets are measured using a vector network analyser (VNA) in X-band. The reflection loss of the materials is computed for different values of x and thickness using the measured permittivity and permeability values. The optimum reflection loss is found to be −43 dB for hexaferrite pellet (x = 0.5) at a thickness of t = 1.7 mm. Microwave absorbing paint pellets are prepared by mixing hexaferrite powder with polyimide solution and their complex permeability and permittivity are also measured using a VNA. Using these measured values, radar cross-section reduction simulation for artillery shells has been carried out using electromagnetic simulation software in the 8–10 GHz frequency range. A maximum radar cross-section reduction of 15 dB has been observed for a 30 mm artillery shell at 9 GHz.