Abstract: | 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 0.254mm 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 30dB, the noise coefficient is better than 2.5dB, the carrier suppression is greater than 50dB, the modulation suppression is greater than 30dB. After various ground tests and in-orbit flight, it has been verified that its indicators meet the requirements. |