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Special Graduate Schools
Graduate School of IT Convergence
Department of IT Convergence Engineering
3. Theses(Master)
The Multipactor Test results on the X Band filter of Space Qualification Model appropriated for the Geostationary Satellite
- Alternative Title
- The Multipactor Test results on the X Band filter of Space Qualification Model appropriated for the Geostationary Satellite
- Author(s)
- 박종희
- Alternative Author(s)
- Jong-hee Park
- Advisor
- 김영길
- Department
- IT융합대학원 IT융합공학과
- Publisher
- The Graduate School, Ajou University
- Publication Year
- 2017-08
- Language
- eng
- Alternative Abstract
- In this thesis, regarding as the X Band Output Filter applied to geostationary satellite, qualification tests including multipactor analysis should be performed in the stage of design. The analysis is performed using the ECSS multipactor tool and the VMF method etc. Based on some papers, the ECSS multipactor tool is underestimated the breakdown threshold than the VMF method. In case of multipactor analysis for X Band Output Filter EM with the center frequency 8,212.5 MHz, channel band width 100 MHz, 2 mm Gap and 100 W input is shown the margin of 6.2 dB. In this reason, the multipactor test is required. But according to the changes of requirement for the X Band Output Filter QM, the changes are as follows, the center frequency 8,200 MHz(2B)/8,300 MHz(2A), channel band width 62.2 MHz and 120 W input power handling capability and 2.5 mm Gap. By reflecting these requirements and extended Gap, the analysis by using ECSS multipactor tool is shown the margin more than 8 dB. The multipactor test is not required. However, using VMF method, since multipactor margin is less than 8 dB, this multipactor test should be performed according to the ECSS Standard. To do multipactor test, multipactor test parameter of input power is decided by the choice of more than 4 dB higher value based on the peak input power (120 W) of X Band Output Filter. The 4 dB higher value is 300 W, considering the relaxation of the test, 540 W input power is selected in this multipactor test. The locations of the electron seeding by strontium radioactive beta sources are decided by the results of thermal, thermo-elastic analysis and random vibration analysis. The critical areas for electron seeding are the center section of BPF & LPF respectively and the joint section between BPF and LPF. In multipactor test, the RF Breakdown detections systems are using both global methods with third harmonic monitoring, nulling detection system and local methods with electron avalanche detection and optical detection system. Through from 100 W input to 540 W input, the multipactor test for X Band Output Filter is performed successfully and there is no abnormal behavior on the filter. This means that the X Band Output Filter is well designed for the space qualification model. The multipactor test is reaffirmed and verified for the multipactor-free X Band Output Filter. In case of having sufficient multipactor margin over 8 dB using thorough multipactor analysis, additional multipactor test is not required according to the recommendation of ECSS Standard.
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- Special Graduate Schools > Graduate School of IT Convergence > Department of IT Convergence Engineering > 3. Theses(Master)
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