Summary
International Symposium on Antennas and Propagation
2009
Session Number:3E1
Session:
Number:3E1-4
Analytical Models for Calculating Attenuation in Coplanar Waveguides
Payal Majumdar, A.K.Verma,
pp.1075-1078
Publication Date:2009/10/21
Online ISSN:2188-5079
Summary:
Coplanar waveguides (CPW’s) have received considerable attention due to several advantages offered for monolithic microwave integrated circuits (MMIC’s) applications. The available commercial software tools are capable of determining the characteristic impedance and propagation constant accurately; they fail to provide realistic estimates of line loss. Holloway and Kuester (HK) [1, 2] have used the concept of stopping distance with the standard perturbation method to compute the conductor loss of a coplanar waveguide (CPW) shown in Fig.1. However, theoretical stoppingdistance is valid only for the isolated strip conductor [7]. It is not sufficiently accurate for computation of conductor loss of CPW. In the present work, we studied the nature of the stopping distance and it is also extracted from experimental results of Haydl et al. in different ways and then curve-fitted to obtain closed- form expressions of the stopping- distance. Those expressions are used with HK model to obtain the improved HK models. The accuracy of the improved HK models is tested against Haydl et al. [4, 5] and Ponchak et al. [6].