Branch-line couplers using unequal line lengths


Toker C. , Saglam M., Ozme M., Gunalp N.

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, cilt.49, ss.718-721, 2001 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 49 Konu: 4
  • Basım Tarihi: 2001
  • Doi Numarası: 10.1109/22.915448
  • Dergi Adı: IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
  • Sayfa Sayıları: ss.718-721

Özet

General solutions for branch-line couplers using different Line lengths are provided in this paper. Explicit expressions are derived with which a hybrid with any given power division ratio can be designed. In the design, one of the characteristic impedances or lengths of the branches can be chosen arbitrarily to suit a given design specification, This approach brings flexibility in choosing the characteristic impedances or the lengths of the branches, and is helpful especially in monolithic-microwave integrated-circuit applications where restrictions imposed on microstrip transmission lines do not allow the use of conventional branch-line couplers employing quarter-wave-long lines, However, the resultant bandwidth is narrower compared to that of the conventional coupler.