An Analytical Approach for a Novel Coupled-Line Dual-Band Wilkinson Power Divider

A novel generalized coupled-line circuit structure for a dual-band Wilkinson power divider is proposed. The proposed power divider is composed of two coupled lines with different even- and odd-mode characteristic impedances and two lumped resistors. Using rigorous even- and odd-mode analysis, the an...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2011-02, Vol.59 (2), p.286-294
Main Authors: Wu, Yongle, Liu, Yuanan, Xue, Quan
Format: Article
Language:English
Subjects:
Applied sciences
Circuit properties
Coupled line
Dual band
Electric, optical and optoelectronic circuits
Electronic equipment and fabrication. Passive components, printed wiring boards, connectics
Electronics
Equations
Exact sciences and technology
Impedance matching
Mathematical model
Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits
Power dividers
Resistors
Scattering parameters
Wilkinson power divider
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Summary:A novel generalized coupled-line circuit structure for a dual-band Wilkinson power divider is proposed. The proposed power divider is composed of two coupled lines with different even- and odd-mode characteristic impedances and two lumped resistors. Using rigorous even- and odd-mode analysis, the analytical design equations for this proposed power divider are obtained and the ideal closed-form scattering parameters are constructed. Since the traditional transmission line is a special case of coupled line (coupled coefficient is zero), it is found that traditional noncoupled-line dual-band (including single band) Wilkinson power dividers and previous dual-band coupled-line power dividers are special cases of this generalized power divider. As a typical example, which could only be designed by using this given design equations, a compact microstrip 3-dB power divider operating at both 1.1 and 2.2 GHz is designed, fabricated, and measured. There is good agreement between calculated and measured results.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2010.2084096