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Analysis and Design of Bandpass Single-Pole–Double-Throw FET Filter-Integrated Switches

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5 Author(s)

This paper proposes a method to integrate a single-pole - double-throw (SPDT) switch and a quarter-wavelength bandpass filter. A 1-GHz SPDT hybrid switch and a 60-GHz pseudomorphic HEMT monolithic-microwave integrated-circuit SPDT switch with 30% fractional bandwidth are demonstrated. The 1-GHz SPDT switch achieves 1.5-dB insertion loss and 20-dB isolation at center frequency. For the 60-GHz SPDT switch, the measured insertion loss is lower than 2.5 dB and the isolation is higher than 27 dB. The low insertion loss and high isolation show that no performance is degraded when integrating the filter function. The analysis of the power performance is also described. Using the device dc-IV curves, the power compression point can be predicted.

Published in:

IEEE Transactions on Microwave Theory and Techniques  (Volume:55 ,  Issue: 8 )