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Novel low-loss delay line for broadband phased antenna array applications

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6 Author(s)
Zhaug, W.-M. ; Dept. of Appl. Sci., California Univ., Davis, CA, USA ; Hsia, R.P. ; Liang, C. ; Song, G.
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The microwave propagation velocity along a nonlinear transmission line is a function of dc bias, hence, a nonlinear transmission line (NLTL) can be utilized as a broadband delay line. A hybrid NLTL has been fabricated in a proof-of-principle experimental concept test where a 1.1-ns true time delay with <4-dB insertion loss has been measured in good agreement with theory. A 2×2 NLTL-based antenna array has been utilized to demonstrate beam steering at 5 GHz. Using parameters appropriate to varactors tested by our group at 60 GHz, a monolithic NLTL is predicted to exhibit <3.4-dB insertion loss and 200 ps delay at 20 GHz

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Microwave and Guided Wave Letters, IEEE  (Volume:6 ,  Issue: 11 )