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Dual Ring Balun-BPF with Improved Balanced Port Characteristics

A dual ring structure for the Balun-bandpass filter (Balun-BPF) to improve balanced-port characteristics is presented. The conventional Balun-BPF has limitations in output symmetry and skirt steepness. A dual ring structure is introduced and a suitable...
Most modern microwave communication systems require balanced components as well as unbalanced structures. In some wireless applications, such as dipole antennas, balanced LNAs, mixers, power amplifiers and so on, a balun frequently connects a bandpass filter with balanced components. 1,2 Recently, simple balun-BPFs and their design equations have been...
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