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Conference Paper
Simultaneous reduction of amplitude and group-delay variation of input demultiplexer for Ku band satellite transponder
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- Authors
- Juseop Lee, Man Seok Uhm, In-Bok Yom, Seong Pal Lee, Chun Kwon Choi
- Issue Date
- 2003-10
- Citation
- Vehicular Technology Conference (VTC) 2003 (Fall), pp.2669-2672
- Publisher
- IEEE
- Language
- English
- Type
- Conference Paper
- Abstract
- In this paper, design and realization of input demultiplexer (IMUX) for Ku band satellite transponder is described. Circulator chain structure has been used for demultiplexing each channel. Each channel consists of channel filter and external equalizer. External equalizers are designed to reduce the group delay variation and amplitude variation of channel filters simultaneously. Dual-mode technique is adopted for reducing the mass and volume of both the channel filters and external equalizers. Channel filters are designed to have 8-pole elliptic response and equalizers to be of 2-pole reflection-type. For good temperature stability characteristics, INVAR material is used for cavities, irises, and tuning screws of channel filters and external equalizers. The frequency drift has been taken into consideration in design procedure and measured by thermal test. Input demultiplexer is shown to be suitable for Ku band satellite transponder.
- KSP Keywords
- Amplitude Variation, Design procedure, Dual-Mode, Elliptic response, Frequency drift, Ku-Band, Reflection-type, Simultaneous reduction, Stability characteristics, Temperature stability, chain structure