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Coupled Line Rat-Race Coupler with Wide Adjustable Power Dividing Ratio and Uncrossed Input/Output Ports

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Figure

Figure 1 shows the schematic diagram of the proposed rat-race coupler. It is composed of a pair of1 and a transmission coefficient of, the-parameters of the rat-race coupler can be expressed in a matrix form [18], as shown below.⎡◦ phase-shifting line, theSo
Figure 2. Even-odd mode circuits of the proposed adjustable TRD coupler under different excitations.(a) Even-even mode
Table 1.Detailed parameters of L1, C1, the coupling of the proposed coupled line, and thecorresponding power dividing ratio of the rat-race coupler.
Figure 4. The proposed rat-race coupler. (a) Layout. (b) Photograph.
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