Conformity - November 2008 - (Page 22) will result in more specific requirements for this antenna type. Several text additions for clarification and ease of use include a redesign of Table 3, addition of the Edmax equation for the vertical polarization into Annex A, and specification of the minimum frequency resolution needed. An addition of a table for site specific corrections for dipole antennas will be included in this revision (similar to Annex G for biconicals). This standard is revised to improve understanding, promote comprehension, incorporate technical advances, and add corrections as needed since the last version. There are several sources for these changes, including feedback from the users of the document, and harmonization with similar international standards and other national standards. When technical advances are made, they too are incorporated into the standard. Removal of any typographical errors and further clarifications of existing text and figures are continual components in the revision/maintenance cycle. In this current cycle, about one third of the proposed changes relate to clarifications and typographical corrections or additions to existing text. Approximately one fourth of the current work is related to harmonization with other standards. The remaining changes are for technical advances with EMC antenna measurement methodologies. Since the last revision of this standard was published in 2006, the completion of this next revision is being targeted for 2009. While overall goals are currently scripted, specific details are being molded by the working group. If you have comments on these topics, or wish to assist in the development of this standard, contact C63® at www.c63.org. This U.S. national standards committee always welcomes new members that have an interest in seeing this standard, or its other standards, developed with newer and more accurate details in a timely manner. Mike Windler is Operations Manager for North American EMC and NEBS at Underwriters Laboratories, and the chair of ANSI ASC C63 Subcommittee 1 on “Techniques and Development.” He can be reached at Michael.J.Windler@us.ul.com. Zhong Chen is a senior principal design engineer at ETS-Lindgren, and can be reached at Zhong.Chen@ets-lindgren.com. Dennis Camell is a senior engineer at the National Institute of Standards and Technology, and chairs the Working Group for revisions to ANSI C63.5. He can be reached at camell@boulder.nist.gov. The authors acknowledge and thank Don Heirman of Don HEIRMAN Consultants, Dan Hoolihan of Hoolihan EMC Consulting, and Bill Hurst of the Federal Communications Commission (FCC) for their invaluable reviews of this article. References 1. A. Smith, “Standard site method for determining antenna factors”, IEEE Trans. EMC, vol. 24, no. 3, pp. 316-322, Aug. 1982. A. Smith, R. German, and J. Pate, “Calculation of site attenuation from antenna factors”, IEEE Trans. EMC, vol. 24, no. 3, pp. 301-316, Aug. 1982. ANSI C63.5-1988; American National Standard for Electromagnetic Compatibility - Radiated Emission Measurements in Electromagnetic Interference (EMI) Control - Calibration of Antennas (9 kHz to 40 GHz). ANSI C63.4-1988; American National Standard for Electromagnetic Compatibility – Radio-Noise Emissions from Low-Voltage Electrical and Electronic Equipment in the Range of 10 kHz to 1 GHz – Methods of Measurement. Z. Chen, M. Windler, “Systemic errors in normalized site attenuation testing”, Compliance Engineering, Jan-Feb 2000. ANSI C63.6-1996; American National Standard Guide for the Computation of Errors in Open-Area Test Site Measurements. G. Burke, A. Poggio, Numerical electromagnetics code (NEC) – method of moments: A user-oriented computer code for analysis of the electromagnetic response of antennas and other structures, Lawrence Livermore Laboratory, Jan. 1981. M. Windler, Z. Chen, “Imperfections in the theoretical NSA model can adversely or favorably affect a site validation measurement and a proposal for correction factors for broadband biconical antennas”, IEEE Intl. Symp. Electromag. Compat., Washington, DC, 2000. Z. Chen, M. Foegelle, “An improved method for determining normalized site attenuation using log periodic dipole arrays”, IEEE Intl. Symp. Electromag. Compat., Washington, DC, 2000. 2. 3. 4. 5. 6. 7. 8. 9. 10. Z. Chen, M. Foegelle, “Complex fit normalized site attenuations for antennas with complex patterns”, IEEE Intl. Symp. Electromag. Compat., Boston, MA, 2003. 11. ANSI C63.5-2006; American National Standard for Electromagnetic Compatibility - Radiated Emission Measurements in Electromagnetic Interference (EMI) Control - Calibration of Antennas (9 kHz to 40 GHz). 12. ANSI C63.7-2005; American National Standard Guide for Construction of Open-Area Test Sites for Performing Radiated Emission Measurements. 13. D. Camell, R. Johnk, D. Novotny, C. Grosvenor, ”Freespace antenna factors through the use of time-domain signal processing”, IEEE Intl. Symp. Electromag. Compat., Honolulu, HI, 2007. 14. D. Camell, R. Johnk, B. Davis, M. Taylor, “Verification of an EMC facility retrofit by time-domain and field uniformity measurements”, IEEE Intl. Symp. Electromag. Compat., Honolulu, HI, 2007. 15. D. Camell, R. Johnk, K. Hall, “Exploring site quality above 1 GHz using double-ridged horns”, Intl. Zurich Symp. Electromag. Compat. Zurich, 2001. FAST Link www.conformity.com/2330 22 Conformity november 2008 http://www.c63.org http://www.conformity.com/2330
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