Active and Passive Electronic Components

Active and Passive Electronic Components / 2004 / Article

Open Access

Volume 27 |Article ID 456935 |

Nihad Dib, Qiu Zhangb, Ulrich Rohde, "New Cad Model of the Microstrip Interdigital Capacitor", Active and Passive Electronic Components, vol. 27, Article ID 456935, 9 pages, 2004.

New Cad Model of the Microstrip Interdigital Capacitor

Received07 Oct 2003
Revised17 Nov 2003


A new model for the microstrip line interdigital capacitor is proposed. This model consists of calculating the 2N×2NY-matrix of the N coupled lines using the multiple coupled line tool. Then, this matrix is reduced to a 2×2 matrix using simple circuit theory. The capacitance at the end of each finger is taken into consideration using closed-form expression of the coplanar waveguide open-end capacitance. This model can predict the resonances that might appear around the quarter-wavelength frequency. These resonances are caused by the coupling between the fingers and exist only in capacitors with four fingers or more. Very good agreement is obtained between the results of our model and those obtained using the software HFSS and measurements.

Copyright © 2004 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

More related articles

 PDF Download Citation Citation
 Order printed copiesOrder

We are committed to sharing findings related to COVID-19 as quickly as possible. We will be providing unlimited waivers of publication charges for accepted research articles as well as case reports and case series related to COVID-19. Review articles are excluded from this waiver policy. Sign up here as a reviewer to help fast-track new submissions.