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A Tunable Metamaterial Phase-Shifter Structure Based on a 0.13μm CMOS Active Inductor

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3 Author(s)
Abdalla, M.A.Y. ; Dept. of Electr. & Comput. Eng., Toronto Univ., Ont. ; Khoman Phang ; Eleftheriades, G.V.

This paper presents a novel tunable metamaterial-based phase-shifter structure utilizing active circuits. It comprises a microstrip transmission line loaded with series varactors and tunable active shunt inductors to increase the phase tuning range and maintain the input & output matching of the metamaterial phase shifter. The proposed phase shifter is capable of providing both a positive and negative phase shift. The active inductors are fabricated in a 0.13mum CMOS process and operate from a 1.5V supply, a 1:2.9 inductance tuning range is measured at 2.5GHz with a tunable peak quality factor >100. The performance of the metamaterial phase shifter unit-cell is simulated using the measured active inductor S-parameters, it achieves a phase tuning range of plusmn20deg at 2.5GHz, with <0.6dB insertion loss and better than -30dB reflection loss

Published in:

Microwave Conference, 2006. 36th European

Date of Conference:

10-15 Sept. 2006

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