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A practical broadband balun with a higher bandedge frequency for a differential-mode antenna is demonstrated. The practical balun consists of an asymmetric broadside coupled line in free space and via-pads to connect to the antenna or soldering pads on the same surface. The rejection band for the balun with different configurations of the pads is analyzed with mixed-mode S-parameters, and the upper...
Miniature broadband 1:1 baluns for differential mode antennas are exhibited with an asymmetric broadside coupled line in an inhomogeneous medium. To design characteristics of a balun for both the in-band and the rejection band, c- and π-mode parameters for the coupled lines are extracted by both simulation and measurement. The rejection band of the broadband balun is shown to be caused by the c-mode...
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