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Airbridges for slotline mode suppression in THz coplanar waveguide

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Abstract

Coplanar waveguides (CPW) are attractive transmission lines for monolithic microwave integrated circuits due to low dispersion and easy integration with planar devices. Due to the presence of two ground planes, both the quasi-TEM symmetric CPW mode and non-TEM asymmetric slotline mode can propagate, as shown in figure 1. To suppress the unwanted slotline mode, airbridges are used1 to connect the ground planes on either side of the central conductor at discontinuities in the waveguide which would mix the modes.

© 1995 Optical Society of America

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