Miniaturised dual-band branch-line coupler


A unique topology of a miniaturised twin-band branch-line coupler with a 3 dB power split is presented. The compact design is achieved by folding the transmission line sections into the inside of a circuit. The initial dimensions are obtained at the equivalent circuit level. Style closure is conducted at the electromagnetic-simulation model level. The coupler operates on frequencies of one and a pair of GHz, and features miniaturisation of 75percent compared with the standard structure. Experimental validation of the fabricated prototype is provided.

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