Balanced circulator structure with enhanced isolation characteristics

Microwave and Optical Technology Letters

Volumn 50, Issue 9, 2008, Pages 2389-2391

  Lim, Won Gyu ^a   Yu, Jong Won ^a  

^a Korea Advanced Institute of Science and Technology (KAIST)   (South Korea)

Author keywords

Circulator; Front end; Isolation; Tx leakage; UHF RFID

Indexed keywords

OPTICAL DESIGN; SULFATE MINERALS;

BRANCH-LINE COUPLERS; CENTER FREQUENCIES; CIRCULATOR; FRONT-END; ISOLATION; ISOLATION CHARACTERISTICS; MATCHED LOAD; MEAS URED RESULTS; PERFORMANCE DEGRADATION; TRANSMITTER AND RECEIVER; TX LEAKAGE; UHF RFID; VARYING LOAD;

CMOS INTEGRATED CIRCUITS;

EID: 48849091660     PISSN: 08952477     EISSN: None     Source Type: Journal    
DOI: 10.1002/mop.23696     Document Type: Article

References (7)

1. S.L. Karode and V.F. Fusco, Feedforward embedding circulator enhancement in transmit/receive applications, IEEE Microwave Wireless Compon Lett 8 (1998), 33-34.
2. J.H. Jung, J.H. Kim, S.M. Kim, and K.C. Lee, New circulator structure with high isolation for time division duplexing radio systems, IEEE Vehicular Technol Conf 4 (2005), 2766-2769.
3. W.K. Kim, M.K. Lee, J.H. Kim, H.S. Lim, J.W. Yu, B.J. Jang, and J.S. Park, A passive circulator with high isolation using a directional coupler for RFID, Microwave Symp Dig IEEE MTT-S Int (2006), 1177-1180.
4. J. A. Weiss, G. F. Dionne, and D. H. Temme, The ring-network circulator for integrated circuits: theory and experiments, IEEE Trans Microwave Theory Tech 43 (1995), 2743-2748.
5. W. I. Son, W. G. Lim, M. Q. Lee, S. B. Min, and J. W. Yu, Printed square quadrifilar spiral antenna for UHF RFID reader, IEEE AP-S Int Symp (2007), 305-308.
6. S. Hara, T. Tokumitsu, and M. Aikawa, Novel unilateral circuits for MMIC circulators, IEEE Trans Microwave Theory Tech 38 (1990), 1399-1406.
7. C.A. Balanis, Antenna Theory, 2nd ed., Wiley, New York, 1982, Chapter 14, p. 768.