论文信息 - A 800- to 3200-MHz Wideband CPW Balun Using Multistage Wilkinson Structure

A 800- to 3200-MHz Wideband CPW Balun Using Multistage Wilkinson Structure

A novel ultra-wide band CPW (coplanar waveguide) balun having the structure of multistage Wilkinson power divider is proposed. It has an 180deg phase inverting structure between signal line and ground planes of CPW transmission line. The 3-stage Wilkinson power divider is transformed directly into the ultra-wide band balun without any cost of the size and performances. The measurement shows the right S-parameters as a power divider and the proper out of phase as a balun. The measured amplitude and phase unbalances at output ports are plusmn 0.5dB and plusmn 6deg, respectively over 800~3200MHz, while the maximum insertion loss is 0.8dB

[1] E. J. Wilkinson. An N-Way Hybrid Power Divider , 1960 .

[2] Ke Wu,et al. Size-reduction and band-broadening design technique of uniplanar hybrid ring coupler using phase inverter for M(H)MIC's , 1999 .

[3] J. Rogers,et al. A 6 to 20 GHz planar balun using a Wilkinson divider and Lange couplers , 1991, 1991 IEEE MTT-S International Microwave Symposium Digest.

[4] Jong-Sik Lim,et al. A size-reduced CPW balun using a "X"-crossing structure , 2005, 2005 European Microwave Conference.

[5] S. Cohn. A Class of Broadband Three-Port TEM-Mode Hybrids , 1968 .

[6] Chun Hsiung Chen,et al. Miniaturized uniplanar 180/spl deg/ hybrid-ring couplers with 0.8 /spl lambda//sub g/ and 0.67 /spl lambda//sub g/ circumferences , 2000, 2000 Asia-Pacific Microwave Conference. Proceedings (Cat. No.00TH8522).

[7] L. Young. Tables for Cascaded Homogeneous Quarter-Wave Transformers , 1959 .

[8] Isabelle Zaquine,et al. New wideband, 0.67λg circumference 180° hybrid ring coupler , 1994 .

[9] Jong-Sik Lim,et al. A 700- to 2500-MHz microstrip balun using a Wilkinson divider and 3-dB quadrature couplers , 2005 .