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A generalized balun structure with a single stub is presented in this paper. The balun is designed based on a four-port device with one port set to be open-circuited. Even-odd mode method is applied to analyze its performance. The derived design equations show that multiple sets of solutions are available for the proposed balun. Therefore, it is highly flexible for practical implementations. To validate...
In this paper, we present the system applications of planar couplers. A uni-planar 3dB 180° coupler with fully symmetrically allocated input and output ports is designed for this purpose. Different from the conventional rat-race coupler, it integrates a compact crossover with a modified conventional coupler to rearrange the Σ, Δ, coupling, and through ports of the 180° coupler. The full-wave electromagnetic...
A novel design of tri-band branch-line couplers using tri-band transmission lines is presented in this paper. The proposed tri-band transmission line employs a Pi-type line with open- and short-ended stubs. The line with Pi-type structure is applied to realize the dual-band operation at the first two frequencies (f2/f1). To achieve the third operating frequency ratio (f3), the open- and short-ended...
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