一种Ka频段单通道调制器的设计与实现

Design and implementation of a Ka band single channel modulator

随着航天事业的不断发展,卫星平台及有效载荷的轻量化、小型化是未来航天系统的发展趋势。单通道单脉冲跟踪系统在航天器中有着广泛的应用,而单通道调制器是单通道单脉冲跟踪系统的重要组成部分。为顺应星载自跟踪系统轻量化、小型化发展趋势,根据工程化要求,采用多芯片微组装技术,通过合理的系统分析和仿真设计,在厚度为0.254mm、相对介电常数为2.2的ROGERS 5880介质基板上设计实现了一种Ka频段单通道调制器。该调制器实现了小型化和集成化,采用BJ260波导作为输入,其和通道增益大于30dB,噪声系数优于2.5dB,载波抑制大于50dB,调制抑制大于30dB,经过地面各项试验及在轨飞行验证,其各项指标满足要求。

With the development of space industry, the lightweight and miniaturization of satellite platform and payload is the development trend of space system in the future. Single channel monopulse tracking system is widely used in spacecraft, and single channel modulator is an important part of single channel monopulse tracking system. In order to comply with the development trend of lightweight and miniaturization of spaceborne self-tracking system, according to the engineering requirements, a Ka band single channel modulator is designed and implemented on ROGERS 5880 dielectric substrate with thickness of 0.254 mm and relative dielectric constant of 2.2 through reasonable system analysis and simulation design based on multi-chip microassembly technology. The modulator realizes miniaturization and integration, BJ260 waveguide is used as the input, and its sum channel gain is greater than 30 dB, the noise coefficient is better than 2.5 dB, the carrier suppression is greater than 50 dB, the modulation suppression is greater than 30 dB. After various ground tests and in-orbit flight, it has been verified that its indicators meet the requirements.