| Title |
Miniaturized Balun with Reduced Coupled-Line and its Application to the Design of Balanced-Type Filter |
| Keywords |
발룬 ; 평형-불평형 ; 평형 필터 Balun ; Balanced-Unbalanced ; Balanced-Type Filter |
| Abstract |
A distributed balun such as Marchand balun typically shows good phase and amplitude balances, but its size is somewhat large especially in lower frequency band. In contrast, a lumped balun has compact size but its performance is not good compared with that of a distributed one. In this paper the distributed-coupled line can be reduced effectively by using the lumped-distributed implementation. Designed balun has two coupled line of each {Λ}/72 and shows magnitude balance of 0.05 dB, phase balance of 0.7° in passband. Balanced-type filter is designed using balun and it has insertion loss of 8 dB, return loss of 7 dB, magnitude balance of 0.2 dB, and phase balance of 1.2° in passband. |