| Synthesis and characterization of complex pervoskite BMT ceramics and the effect of gamma radiation at microwave frequency |
| K. Ashok1, B. Masin1, Nishant Shukla2, Kinshuk Gupta3, Vikas Gupta2, Praveen Kumar Ambati2, H. Sreemoolanadhan1 |
1Vikram Sarabhai Space Centre, Thiruvananthapuram, Kerala 695022, India
2Space Applications Centre, Ahmedabad, Gujarat 380015, India
3U.R.Rao Satellite Centre, Bangalore, Karnataka 560017, India |
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Received: June 22, 2021; Revised: September 30, 2021 Accepted: October 20, 2021. Published online: January 31, 2022. |
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| ABSTRACT |
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Ba(Mg1/3,Ta2/3)O3 (BMT), a complex perovskite ceramic with extremely high Qu and that has been the only choice as dielectric resonator (DR) for satellite multiplexers extensively used in communication satellites. BMT DRs have been prepared by solid-state route by single-step calcinations followed by firing the green compacts at about 1600–1650 °C for 20 h. Excellent Qu-factor > 20,000 at 10 GHz achieved after annealing near 1000 °C combined with near-zero τf and dielectric constant (εr) ~ 24. The DRs are subjected to 100 kRad and 1MRad γ irradiation exposure. The resonant frequency and Qu are measured after the irradiation and found to be within the range of measurement error. This paper briefly discusses the BMT processing, characterization, the properties and the effects of γ-radiation. These BMT DRs are useful for Satellite applications. The ten-pole filters have been assembled and its performance tested and verified. |
| Key words:
Dielectric resonator · BMT ceramic · Permittivity · Loss tangent · High Q · Complex perovskite · Radiation effect |
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