A novel hybrid active quasi-circulator for L-band applications

In this contribution a hybrid active quasi-circulator operating in L-Band is presented. E-pHEMT active devices mounted on ceramic substrate with copper metallization have been used. The proposed quasi-circulator is composed by active non-reciprocal phase shifters and classical passive combining structures to get the desired functionality. Insertion losses better than 2.1 dB, isolation higher than 20 dB in the 1.35 ÷ 1.65 GHz frequency band is obtained, while an isolation better than 30 dB over a 15% bandwidth. Port matching is better than 15 dB on coupler's ports, while the splitter one reaches 10 dB. The overall quasi-circulator exhibits a 22 % operating bandwidth.

[1]  Kiyomichi Araki,et al.  A New-Type of Electronic Circulator at 800MHz Band , 1980, 1980 10th European Microwave Conference.

[2]  E. Bergeault,et al.  Noise and power optimization of a MMIC quasi-circulator , 1997 .

[3]  S. Tanaka,et al.  Active circulators—The realization of circulators using transistors , 1965 .

[4]  A. Abdipour,et al.  Design a new type of active quasi circulator module , 2008, 2008 Asia-Pacific Microwave Conference.

[5]  Martin J Cryan,et al.  An integrated active circulator antenna , 1997 .

[6]  Y. Ayasli,et al.  Field effect transistor circulators , 1989, International Magnetics Conference.

[7]  I. J. Bahl.  The design of a 6-port active circulator , 1988, 1988., IEEE MTT-S International Microwave Symposium Digest.

[8]  M. A. Smith,et al.  GaAs monolithic implementation of active circulators , 1988, 1988., IEEE MTT-S International Microwave Symposium Digest.

[9]  I. Wolff,et al.  New types of MMIC circulators , 1995, Proceedings of 1995 IEEE MTT-S International Microwave Symposium.

[10]  George E. Stratakos.  CAD design of an active MMIC circulator at 21-26 GHz frequency band. , 1998 .

[11]  Ernesto Limiti,et al.  Novel active non-reciprocal phase hifter , 2011 .

[12]  A. Moussa,et al.  Design of a novel circulator for wireless transceivers , 2007, 2007 Internatonal Conference on Microelectronics.