Abstract
A generalized impedance transformer for arbitrary real terminated impedances is proposed in this article. This transformer mainly features 90° phase shifting at the operating frequency, matching for arbitrary real terminated impedances, and improved spurious suppression. It consists of two-section transmission lines and three parallel transmission-line stubs. By equating the ABCD matrixes of the proposed impedance transformer and conventional quarter-wavelength impedance transformer, closed-form design equations are obtained as a final analytical design approach. Several numerical and measured microstrip transformers with improved spurious suppression are presented. Finally, experimental performances verify this generalized structure and the proposed rigorous design equations.
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