FREE IEEE Paper : A 10:1 Unequal Wilkinson Power Divider Using Coupled Lines With Two Shorts

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An alternative way to realize an unequal power divider with large dividing ratio can be through using a simple directional coupler. In order to obtain zero phase difference at the output ports, a phase shifter is needed to add to the coupler. This can be realized by using either a piece of transmission line or an integrated wideband phase shifter. The circuit will then either be narrowband in phase response due to presence of the extra transmission line, or become complicated when using the integrated wideband phase shifter. On the other hand, the structure of the directional coupler is more sensitive to the fabrication tolerance, since its dividing ratio is directly determined by coupling
coefficient. In our proposed power divider, however, the coupling coefficient of the coupled line only slightly affects the bandwidth, therefore leading to an easy fabrication.


To avoid the fabrication difficulties, the high characteristic impedance line is realized by using a coupledline section with two shorts. A design example at 2 GHz is fabricated and tested. The measurements agree very well with the simulations. The measured bandwidth of is about 16%. Over this operation bandwidth, the isolation is better than . The measured amplitude balance betweenoutput port 2 and port 3 is between and , and the phase difference is between 0 and 4.6 . The proposed
structure is compatible with single layer integration and easy to design, therefore very attractive for high power dividing ratio applications.

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