What is it about?
The power handling of tunable, high-Q, substrate-integrated waveguide (SIW) bandpass filters is predicted using a circuit-electromagnetic (EM) co-design approach. The prediction method is validated through measurement, where a great agreement between the results is obsereved.
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Why is it important?
The presented prediction approach is directly applied to a heavily-loaded evanescent-mode cavity filter in bandpass domain rather than lowpass domain. It is shown that the design method is very accurate for predication of power handling in high-Q structures with severe aspect ratios like evanescent-mode cavity SIW bandpass filter. Also, for the first time, it is shown that a 4% tunable, second-order Butterworth SIW bandpass filter with tuning range from 3.0 to 3.6 GHz is able to handle 44.3 dBm at 3.0 GHz continuous-wave, which is in a very good agreement with the predicted value. In fact, the presented approach predicts the filter power handling to be between 43.7 dBm and 45.7 dBm.
Perspectives
This work presents a step-by-step systematic procedure for accurate modelling and study of the power handling in tunable, high-Q, SIW bandpass filters. It expands previous available methods in literature for structures with a large aspect ratio (with dimensions ranging from 10’s of micrometres to 100’s of millimetres) which exhibits very high sensitivity to small structural features.
Dr. Shahrokh Saeedi
University of Oklahoma
Read the Original
This page is a summary of: Prediction of power handling in tunable, high-Q, substrate-integrated, evanescent-mode cavity bandpass filters, Electronics Letters, May 2016, the Institution of Engineering and Technology (the IET),
DOI: 10.1049/el.2016.0567.
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