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A compact quadrature coupler based on coupled artificial transmission lines

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2 Author(s)
Zhiyang Liu ; Sch. of Eng. & Appl. Sci., Univ. of Virginia, Charlottesville, VA, USA ; Weikle, R.M.

A new compact quadrature hybrid based upon artificial transmission lines (ATLs) is presented. Miniaturization is achieved through reduced even- and odd-mode phase velocities which are achieved using capacitive loading with interdigital open-circuited stubs. A proof-of-concept microstrip implementation of the quadrature hybrid exhibits performance comparable to a conventional branch-line coupler while occupying only 14% of the area. The compact structure of the hybrid is useful for RF applications and is suitable for scaling to frequencies above 100GHz where the size of shielded-microstrip components must be limited to prevent excitation of high-order modes.

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:15 ,  Issue: 12 )