All-Pass/容量結合BPF切替形MMIC移相器

摘要

小形・広帯域な特性を有するAll-Pass/容量結合BPF切替形移相器を提案する．本移相器は，基準状態の動作を容量結合BPF回路とすることで，従来のAll-Pass/BPF切替形移相器に比べ広帯域な特性を得ることが可能となる.提案する回路の有用性を検証するため，45°移相器を試作した．その結果，4-8GHzで挿入損失1.9dB，反射損失14.8dB以上，移相量47°±3．8°と良好な特性が得られた．%A compact and broadband All-Pass/Capacitive-Coupled BPF has been developed. The phase shifter is switching All-Pass network and capacitive-coupled BPF. Because the circuit has external coupling elements, the bandwidth can be arbitrary designed. In this paper, we derived design equations and fabricated 45deg. phase shifter in C-band. The measured return loss was 14.8dB and the insertion loss was 1.9dB at the worst case over in 4-8GHz band. And measured phase shift was 47deg.+/-3.8deg. over the same frequency range.