Ferroelectric polymer composite as radio absorbing material (RAM) for 5th generation stealth fighter aircraft

摘要

In this paper we report the method of synthesis of ferroelectric polymer Polyvinyldene fluoride (PVDF) and three types of PVDF composite polymers viz: PVDF-BaTiO_3[PB], PVDF - TiO_2 [PT] and PVDF-Zinc oxide [PZ] with five different concentrations were prepared by solution mixing method using Dimethylformadide (DMF) as a solvent. Thus prepared samples are self-supporting thin films. The XRD pattern confirms the formation of tetragonal pervoskite structure of ferroelectric phase and shows appropriate mixing of particles intestinally and found to be improved crystallinity with increase of composition in the PVDF matrix. The dielectric constant of the PVDF composites as functions of frequency were measured observed the validation of the Maxwell - Wagner type of interfacial polarization in accordance with Koop's phenomenological theory. Further, the radio absorbing property for these PVDF composites using academic Microwave waveguide setup in both X band & S band were studied by inserting thin films of PVDF composites between Transmitter and Microwave detector for initial power of 40 dB and for 26.9 dB in X band and S band respectively. PVDF composite PT has shown good Radio Absorption compare to PZ composites. Moreover PB shows a remarkable absorption of ～20% of the incident Microwave which is desirable and can be used for the 5th generation stealth fighter Aircrafts and other Military stealth application, while the other PVDF composites are Microwave transparent in both X band and S band and can be used 'Radome' material for the nose of the Fighter aircraft.