Journal of electromagnetic engineering and science

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Low-Loss Broadband Planar Balun with CPW-to-Slotline Transition for UHF Applications

  • Hong, Young-Pyo (Dept. of Electrical and Electronic Engineering, Yonsei University) ;
  • Yook, Jong-Gwan (Dept. of Electrical and Electronic Engineering, Yonsei University)
  • Published : 2009.09.30
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Abstract

This paper presents a low-loss broadband balun that uses a coplanar waveguide-to-slotline field transformation. It operates over a very wide frequency range and is of compact size since it does not depend on a resonant structure. To analyse imbalance, the coplanar wavelength(CPW) input ground is connected to the CPW output ground through various capacitors to introduce common-mode impedances. As the common-mode impedance increased the imbalance became significantly higher at the higher-frequency band compared with the lower-frequency band. The bias-circuit approach is used to improve the operation bandwidth of the lower-frequency band. The measured results show a passband of 200 MHz to 2 GHz, an insertion loss of less than 0.75 dB, and a size of $20{\times}14\;mm$. The amplitude imbalance is approximately 0.3 dB and the phase imbalance is less than $6^{\circ}$ over the entire operational range.

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References

  1. M. C. Tsai, "A new compact wideband balun", IEEE Microwave Millimeter-Wave Monolithic Circuits Symp. Dig., pp. 123-125, 1993
  2. K. Nishikawa, I. Toyoda, and T. Tokumitsu, "Compact and broadband three-dimensional MMIC balun", IEEE Transactions on Microwave Theory and Technique, vol. 47, pp. 96-98, Jan. 1999 https://doi.org/10.1109/22.740087
  3. A. Riddle, "Ferrite and wire baluns with under 1 dB loss to 2.5 GHz" , IEEE MTT-S Symp. Dig., vol. 2, pp. 617-620, 1998
  4. G. A. Hofbauer, "An ultra-wideband microwave balun using a tapered coaxial coil structure working from kHz range to beyond 26.5 GHz", IEEE MTT-S Symp. Dig., vol. 2, pp. 551-554, 2005
  5. H. Chiou, C. Chang, and H. Lin, "Balun design for uniplanar broad band double balanced mixer", Electronics Letters, vol. 31, pp. 2113-2114, Nov. 1995 https://doi.org/10.1049/el:19951404
  6. H. -T. Kim, S. Lee, J. -H. Park, Y. -K. Kim, and Y. Kwon, "Ultra-wideband uniplanar MMIC balun using field transformations", Electronics Letters, vol. 42, pp. 359-361, Mar. 2006 https://doi.org/10.1049/el:20064317
  7. T. Wooten, L. Larson, "A decade bandwidth, low voltage, medium power Class B push-pull Si/SiGe HBT power amplifier employing through-wafer vias", IEEE Radio Frequency Integrated Circuits Symposium(RFIC) Symp., pp. 519-522, 2008
  8. Z. Zhang, Y. Guo, L. Ong, and M. Y. W. Chia, "A new wide-band planar balun on a single-layer PCB", IEEE Microw. Wireless Compon. Lett., vol. 15, pp. 416-418, Jun. 2005 https://doi.org/10.1109/LMWC.2005.850486
  9. J. Kim, U. Park, S. Oh, J. Koo, Y. Jeong, and D. Ahn, "A 800- to 3200-MHz wideband CPW balun using multistage Wilkinson structure", IEEE MTT-S Symp. Dig., pp. 1141-1144, 2006
  10. Picosecond Model 5310A Phase-Matched Balun. [Online]. Available: http://www.picosecond.com/product/product.asp?prod_id=124#
  11. J. -H. Lee, K.-W. Yeom, "Synthesis of marchand balun using a planar coupled line", Journal of the Korean Institute of Electronic Engineering and Science, pp. 161-166, Feb. 2005
  12. H.-G. Pang, H.-Y. Lee, "Planar balun using microstrip to CPW coupled structure", Journal of the Korean Institute of Electronic Engineering and Science, pp. 919-923, Sep. 2003

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