Development of a defected ground structure wide bandwidth balun on multilayer organic substrate

We present the design and development of a compact wide bandwidth balun on a multilayer organic substrate. A defected ground plane is designed into a multi-layered Marchand balun to achieve wide bandwidth. Our experimental results demonstrate that the balun achieves an average measured insertion loss of 0.5 dB from 1.9 GHz to 18 GHz and ∼1dB from 18 GHz to 20 GHz and a return loss better than 10 dB from 1.9 GHz to 21.5GHz. The measured amplitude imbalance is less than ±1.4 dB from 1 GHz to 21.5 GHz. The measured phase imbalance is less than ±5° from 1 GHz to 19 GHz. To the best of our knowledge, this planar balun has the largest bandwidth ratio reported to date.

[1]  G. Oltman,et al.  The Compensated Balun , 1966 .

[2]  M. C. Tsai.  A new compact wideband balun , 1993, IEEE 1993 Microwave and Millimeter-Wave Monolithic Circuits Symposium Digest of Papers.

[3]  A. Ketterson,et al.  A low loss, 5.5 GHz-20 GHz monolithic balun , 1997, 1997 IEEE MTT-S International Microwave Symposium Digest.

[4]  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.

[6]  Ching-Wen Tang,et al.  Broadband microstrip branch-line coupler with defected ground structure , 2006 .

[7]  Hung-Hsuan Lin,et al.  Novel Broadband Planar Balun Using Multiple Coupled Lines , 2006, 2006 IEEE MTT-S International Microwave Symposium Digest.

[8]  Anh-Vu Pham,et al.  Design and Fabrication of Ultra-Wideband Baluns Embedded in Multilayer Liquid Crystal Polymer Flex , 2007, IEEE Transactions on Advanced Packaging.

[9]  Anh-Vu Pham,et al.  Development of Thin-Film Liquid Crystal Polymer Surface Mount Packages for Ka-band Applications , 2006, 2006 IEEE MTT-S International Microwave Symposium Digest.

[10]  R. Weigel,et al.  An ultra-wideband coupled-line balun using patterned ground shielding structures , 2008, 2008 IEEE Radio and Wireless Symposium.

[11]  S. A. Maas,et al.  A broadband, planar, doubly balanced monolithic Ka-band diode mixer , 1993, IEEE 1993 Microwave and Millimeter-Wave Monolithic Circuits Symposium Digest of Papers.

[12]  Kenjiro Nishikawa,et al.  Compact and broad-band three-dimensional MMIC balun , 1999 .

[13]  N. Marchand,et al.  Transmission-line Conversion Transformers , 1944 .

[14]  A.C. Chen,et al.  Development of low-loss broad-band planar baluns using multilayered organic thin films , 2005, IEEE Transactions on Microwave Theory and Techniques.