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A QPSK modulator with a 2.75-4.75 GHz operating frequency range is presented. The modulator is realised using a broadband power divider, microstrip-slotline-microstrip transitions and Lange couplers. Computer optimised matching circuits are used to maintain a phase error less than 5 degrees and an amplitude phase imbalance error across the band of less than 0.5 dB. The modulator is suitable for MMIC...
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