M Kishihara   T Kawai   Y Kokubo   Ohta, I   
IEICE TRANSACTIONS ON ELECTRONICS E82C(7) 1148-1153 1999年7月
This paper suggests a new type of 180-degree 3dB hybrid, which consists of a cylindrical cavity and four E-plane rectangular waveguides radially coupled with it, ard shows that good hybrid properties are realized by modifying the positions of the ...