Abstract
In this paper, analytical expressions are presented for the microwave
attenuation of slow wave electrodes obtained by periodically loading a
regular coplanar line with capacitive elements. Such electrodes are commonly
used in III-V compound semiconductor electro-optic modulators and other
traveling wave devices. These results are obtained by modifying the existing
analytical loss expressions for regular coplanar lines based on physical
arguments. The predictions of these expressions are compared with
experimental results up to 35 GHz and agreement is found to be very good.
Validity of this analysis is also discussed. It is found that the approach
works very well for lines of practical interest. Hence, the proposed
approach enables complete design of capacitively loaded slow wave electrodes
by predicting the microwave loss with closed-form equations in addition to
velocity and characteristic impedance.
© 2010 IEEE
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