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Directional coupler compensation with optimally positioned capacitances
Publikationstyp
Journal Article
Date Issued
2011-11
Sprache
English
Author(s)
Institut
TORE-URI
Volume
59
Issue
11
Start Page
2824
End Page
2832
Article Number
6029299
Citation
IEEE Transactions on Microwave Theory and Techniques 11 (59): 6029299 (2011)
Publisher DOI
Scopus ID
An accurate design synthesis for the phase velocity compensation in coupled line microstrip couplers by means of parallel capacitances is presented. In contrast to previous approaches, an a priori arbitrary placement of the capacitances along the coupled line structure is considered. By optimizing these positions, the directivity-bandwidth performance is significantly improved. Cases with two and three capacitances are treated extensively. The findings are used to generalize the compensation scheme to any number of capacitances. Throughout the analysis, the parasitic even-mode capacitance is taken into account using a realistic model. Several design examples are presented. Simulation results are confirmed by measurements. They compare favorably with those reported previously.