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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...
In this letter, two types (Type-I and Type-II) of microwave baluns with generalized structures are presented. Different from the conventional transmission-line-based baluns where transmission lines or microstrip lines are used, the proposed baluns are constructed by transmission lines with arbitrary electrical lengths. Both of the two types of baluns are designed based on a symmetric...
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