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A new overlay coupler for direct digital modulator in GaAs HBT

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2 Author(s)
Yi Sun ; Dept. of Electr. & Comput. Eng., Queen's Univ., Kingston, Ont., Canada ; A. P. Freundorfer

A new overlay coupler has been realized at millimeter-wave frequency with an area that is less than one-half that of the Lange coupler. It was used to construct a binary phase-shift keying (BPSK) modulator, employing balanced reflection topology, in which the HBTs acted as switches. It was shown that the BPSK modulator could be modulated at 1 Gb/s at 28 GHz.

Published in:

IEEE Transactions on Microwave Theory and Techniques  (Volume:52 ,  Issue: 8 )