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Optimum Design of Broadband Multisection CoupledLine Couplers with Arbitrary Coupling and Impedance Matching
Homayoon ORAIZI GholamReza GABARANZAD GHADIM
Publication
IEICE TRANSACTIONS on Communications
Vol.E86B
No.9
pp.27092719 Publication Date: 2003/09/01 Online ISSN:
DOI: Print ISSN: 09168516 Type of Manuscript: PAPER Category: Antennas and Propagation Keyword: coupler, coupledline coupler, impedance matching, method of least squares, optimization,
Full Text: PDF(4.9MB)>>
Summary:
In this paper the method of least squares is employed to design an axially symmetric contradirectional multisection coupled  line coupler together with the impedance matching of real generator and load impedances. An error function is constructed for the required coupling (C) based on the squared magnitude of the ratio of the coupler voltage to that at the incident port. Another algorithm based on the reflected and transmitted wave amplitudes is developed by the method of least squares for the design of a coupled  line coupler with impedance matching of different input and output complex impedances and arbitrary coupling and length. The error functions are minimized to determine the coupler geometry, namely the normalized strip conductor widths (u=w/h) and separation (g=s/h) and the coupler length, where h is the substrate thickness. A procedure is presented to provide the initial values of u and g. The computer implementation of the proposed method shows that a proper coupler design is possible for any given coupler length. This is particularly interesting where space limitations impose contraints on the coupler length. The results are favorably compared with available computer simulation softwares.

