By Topic

Dissipation Loss in Multiple-Coupled-Resonator Filters

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

1 Author(s)
Seymour B. Cohn ; Stanford Research Institute, Menlo Park, Calif.

This paper examines the effect of dissipation on the response of multiple-coupled-resonator filters designed from lossless prototype low-pass filters. A simple approximate formula makes possible the computation of center-frequency loss in terms of bandwidth, unloaded Q of the resonators, and the parameters of the prototype filter. It is shown how the insertion loss elsewhere in the pass band and stop band may be computed from the prototype filter after modifying its circuit to take account of dissipation in the resonators. The computational techniques are used to compare several symmetrical designs with each other and with unsymmetrical designs having exact maximally-flat and equal-ripple response in the presence of dissipation. It is found that the symmetrical designs offer lower pass-band loss than the unsymmetrical designs. It is proven that a symmetrical filter based on an equal-element prototype has minimum-possible center-frequency loss for given unloaded Q and stop-band bandwidth, subject to assumptions that the loss per resonator is small and that the stop-band insertion loss may be determined accurately from the highest-power term of the insertion-loss polynomial.

Published in:

Proceedings of the IRE  (Volume:47 ,  Issue: 8 )