An Analytical Approach for a Miniaturized Unequal Wilkinson Power Divider with Filtering Response
Keywords:
CRLH, filtering, scattering parameters, unequal power dividerAbstract
In this paper, a closed-form design method for a novel compact unequal filtering Wilkinson power divider, WPD, based on symmetric and asymmetric right/left-handed (CRLH) coupled-line circuit structures is proposed and investigated. The structure is composed of an input asymmetric CRLH coupled-line (A-CRLH) section along with two output symmetric CRLH coupled-line band-pass filter transformers to provide unequal filtering performance. The analytical design equations along with ideal closed-form expressions for scattering parameters are derived for the proposed structure by using in- and anti-phase (c/π-mode) decomposition method. To theoretically verify the proposed design approach, two filtering unequal WPDs with different high-power dividing ratios of 1:10 and 1:15 are designed and simulated. Finally, as a typical example, a practical filtering WPD with a power-splitting ratio of 1:15 operating at 1.4 GHz, is implemented with more than 55.5% size reduction as compared to conventional one. Good agreement between calculated, simulated and measured results verifies the effectiveness of the proposed power divider for miniaturized, large power dividing ratio and filtering applications.
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References
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