A Fast-Switching Low-Loss 12-GHz Microstrip 4-PSK Path Length Modulator | IEEE Journals & Magazine | IEEE Xplore

A Fast-Switching Low-Loss 12-GHz Microstrip 4-PSK Path Length Modulator


Abstract:

A 4-PSK microstrip modulator operating at data rates of up to 800 Mbits/s at 12 GHz is described. The circuit is made of two cells in series. Each cell consists of a 3-dB...Show More

Abstract:

A 4-PSK microstrip modulator operating at data rates of up to 800 Mbits/s at 12 GHz is described. The circuit is made of two cells in series. Each cell consists of a 3-dB branch-line hybrid coupler and two BTL p-i-n diodes. One cell provides 0° or 90° phase shifts, and the Other 0° or 180° phase shifts, so that four carrier phase values are obtained by appropriately exciting the two cells. The switching time of each cell is 200 ps. Simultaneous switching of both cells increases the switching time to a maximum value of 400 ps. The phase waveforms are nearly rectangular at the above-mentioned data rates. RF insertion loss is 1 dB ± 0.1dB for the four phase values over the 11.7-12.2 GHz frequency band.
Published in: IEEE Transactions on Communications ( Volume: 28, Issue: 10, October 1980)
Page(s): 1824 - 1828
Date of Publication: 06 January 2003

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