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Ka-band RF MEMS phase shifters

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5 Author(s)
Pillans, B. ; Raytheon Syst. Co., Dallas, TX, USA ; Eshelman, S. ; Malczewski, A. ; Ehmke, J.
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As the need for low-loss phase shifters increases, so does the interest in radio frequency (RF) MEMS as a solution to provide them. In this paper, progress in building low loss Ka-band phase shifters using RF MEMS capacitive switches is demonstrated. Using a switched transmission line 4-bit resonant phase shifter, an average insertion loss of 2.25 dB was obtained with better than 15-dB return loss, a similar 3-bit phase shifter produced an average insertion loss of 1.7 dB with better than 13-dB return loss. Both devices had a phase error of less than 13° in the fundamental states. To our knowledge, these devices represent the lowest loss Ka-band phase shifters reported to date

Published in:

Microwave and Guided Wave Letters, IEEE  (Volume:9 ,  Issue: 12 )