Title :
Wideband high-isolation and perfect-balance microstrip rat-race coupler
Author :
Chang, William S.C. ; Liang, C.H. ; Chang, C.Y.
Author_Institution :
Grad. Inst. of Commun. Eng., Nat. Chiao-Tung Univ., Hsinchu, Taiwan
Abstract :
A microstrip rat-race coupler with high isolation and perfect balance is presented. By modifying March´s rat-race coupler with two additional short-circuited stubs, the isolation and the amplitude/phase balance of the proposed coupler improve significantly. The circuit can be easily fabricated on a single-layer substrate using the conventional printed circuit board process.
Keywords :
microstrip couplers; printed circuits; amplitude-phase balance; modified March rat-race coupler; perfect-balance microstrip rat-race coupler; printed circuit board process; short-circuited stub; single-layer substrate; wideband high-isolation microstrip rat-race coupler;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2012.0227
