Design of spaceborne Ku-band four-channel delay module

Abstract

Ku band four-channel delay module is mainly used for dual polarization SAR. The main first function of delay module is to receive the feed RF pulse signal, then delay and power amplification, output to the T/R module. The second function is to receive the echo signal input of the T/R component, after amplification and delay output. The delay module is a four-channel module, the large bit delay is distributed in the main chain, which is used for rough tuning, and the small bit delay is distributed in four branches, which is used for fine tuning. In the delay module, the LTCC microwave multilayer is used in the substrate, the delay is realized by GaAs MMIC delay chip, and the assembly is realized by micro-assembly process. The power / control interface of the module adopts J30JM low frequency connector, which is flexible to plug and pull, and the high frequency interface is in the form of SSMA interface. Finally, the 0-30 wavelength delay is realized in the frequency band 15.8-17GHz range.