CPW balanced amplifier with a new branch-line coupler

  1. Bub-Sang Yun1,2,
  2. Tae-Soon Yun1,
  3. Jong-Chul Lee1,
  4. Jong-Heon Kim1,
  5. Byungje Lee1,
  6. Nam-Young Kim1,
  7. Hyun-Chang Park3

Article first published online: 2 OCT 2003

DOI: 10.1002/mop.11213

Issue

Microwave and Optical Technology Letters

Microwave and Optical Technology Letters

Volume 39, Issue 5, pages 349–351, 5 December 2003

Additional Information

How to Cite

Yun, B.-S., Yun, T.-S., Lee, J.-C., Kim, J.-H., Lee, B., Kim, N.-Y. and Park, H.-C. (2003), CPW balanced amplifier with a new branch-line coupler. Microwave and Optical Technology Letters, 39: 349–351. doi: 10.1002/mop.11213

Author Information

  1. 1

    RFIC Research and Education Center & Mission Technology Research Center, Kwangwoon University, 447-1 Wolgye-dong, Nowon-ku, Seoul 139-701, Korea

  2. 2

    Motorola Korea Design Center, 5th fl., Kumha Bldg., 41-2 Chungdam-dong, Kangnam-ku, Seoul 135-766, Korea

  3. 3

    Millimeter-wave Innovation Research Center (MINT), Dongguk University, 3-26 Pildong, Joong-ku, Seoul 100-715, Korea

Publication History

  1. Issue published online: 2 OCT 2003
  2. Article first published online: 2 OCT 2003
  3. Manuscript Received: 15 MAY 2003

Funded by

  • KOSEF, Dongguk University
  • Korean Ministry of Information and Communication

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Keywords:

  • balanced amplifier;
  • coplanar waveguide;
  • branch-line coupler

Abstract

In this paper, a balanced amplifier with coplanar waveguide structure for wireless LAN applications is presented. To reduce the input VSWR and improve stability, the balanced characteristic is adopted for the amplifier's design. The balanced amplifier is designed by several microwave simulation tools, such as Agilent ADS ver. 1.3, Agilent HFSS ver. 5.6, IMST COPLAN ver. 2.3, and Zeland IE3D ver. 8.0. The new branch-line coupler shows an insertion loss of 3.5 dB and input/output return losses of greater than 20 dB at 5.8 GHz. The balanced amplifier, using a new CPW branch-line coupler, shows a gain of about 10 dB at 5.8 GHz. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 39: 349–351, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11213

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