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In this paper, a wideband sub-array module which has 4-channel T/R modules was built and evaluated. The T/R module has 5-bit digital MMIC phase shifter, attenuator, amplifiers, Wilkinson power dividers, etc. Two absorptive matching equalizers to get uniform gain over multi-octave bandwidth are inserted in the common part of the module. Chip-on-substrate technology was introduced to get the repeatability...
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