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A D-band 180° phase shifter with very low amplitude- and phase-error

: Müller, D.; Längst, J.; Tessmann, A.; Leuther, A.; Zwick, T.; Kallfass, I.


IEEE Microwave Theory and Techniques Society; European Microwave Association; Institute of Electrical and Electronics Engineers -IEEE-:
9th European Microwave Integrated Circuits Conference, EuMIC 2014. Proceedings : 06-07 October 2014, Italy, Rome, EuMW 2014, European Microwave Week
Piscataway, NJ: IEEE, 2014
ISBN: 978-1-4799-5473-5
ISBN: 978-2-87487-036-1
European Microwave Integrated Circuits Conference (EuMIC) <9, 2014, Rome>
European Microwave Week (EuMW) <17, 2014, Rome>
Conference Paper
Fraunhofer IAF ()
phase shifter; switched-type; switches; communication systems; radar systems; metamorphic high electron mobility transistor (mHEMT); millimeter-wave monolithic integrated circuit (MMIC); D-band; beam-steering

Phase shifters are at the heart of phased array systems which enable beam steering techniques. This paper presents a 180° digital phase shifter MMIC employing two SPDT switches which are realized in a 50nm metamorphic high electron mobility transistor technology. For the phase difference generation two identical couplers with different terminations are used. The measurement results show only 0.1dB amplitude imbalance and less than +/- 3:5° phase imbalance between 115 and 155GHz. The transmission loss is less than 5.6dB and the input and output matching are better than -10dB in the considered frequency range. The fabricated chip-size is 1.25 * 0.75mm(2) including the test pads.