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This article first presents a frequency‐selectable branch‐line hybrid coupler.To provide a frequency‐selection function, a dual‐band band‐pass transmission‐line transformer (TLT) with a frequency selective function is used. This is achieved by replacing a dual‐band TLT with a variable capacitively loaded spur‐line filter. The technique is demonstrated with a design at 0.8 and 1.75 GHz. Measured S‐parameter...
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