Skip to main content Accessibility help

We use cookies to distinguish you from other users and to provide you with a better experience on our websites. Close this message to accept cookies or find out how to manage your cookie settings.

Close cookie message
×
Hostname: page-component-76fb5796d-2lccl Total loading time: 0 Render date: 2024-04-26T21:40:23.198Z Has data issue: false hasContentIssue false

9 - Evaluation of small antenna performance

Published online by Cambridge University Press:  05 January 2014

Kyohei Fujimoto  and
Hisashi Morishita
Kyohei Fujimoto
Affiliation:
University of Tsukuba, Japan
Hisashi Morishita
Affiliation:
National Defense Academy, Japan
Get access

Summary

General

Generally, evaluation of small antenna performance tends to be difficult, as the size of an antenna becomes very small. The difficulty of small-antenna measurement originates in small dimensions, asymmetry of antenna structure, and the antenna characteristics sensitive to the influence of its environment. Determination of correct or precise antenna performance will become difficult as the antenna dimension becomes smaller. Evaluation of antenna performance is performed by means of EM simulation and measurement. In this chapter, measurement of small antenna performances is described, whereas simulation is dealt with in Chapter 10. There are no essential differences between small antenna measurement and ordinary antenna measurement. However, as the size of an antenna becomes smaller, special considerations are required in order to assure the reliable evaluation of small antenna performances. Typical attentions are paid for cases:

  1. (1) When the size of an antenna is very small compared with its wavelength or the size of a nearby conductor.

  2. (2) When antenna structure is asymmetric and complicated.

  3. (3) When an antenna is located in a complicated environment.

Although particular considerations are given to the measurement of small antennas, there may be some cases where no effective method is found for the accurate determination of the antenna characteristics. For example, when the size of the antenna is extremely small, the resistance becomes too small to be determined. Another case is where the antenna structure is so complicated that precise measurement is very difficult to perform.

Type
Chapter
Information
Modern Small Antennas , pp. 371 - 388
Publisher: Cambridge University Press
Print publication year: 2014

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Fukasawa, T., Shimomura, K., and Ohtsuka, M., Accurate Measurement Method for Characteristics of an Antenna on a Portable Telephone (in Japanese), IEICE Transactions on Communications, vol. J86-B, September 2003, no. 9, pp. 1895–1905.Google Scholar
Icheln, C., Krogerus, J., and Vainikainen, P., Use of Balun Chokes in Small-Antenna Radiation Measurements, IEEE Transactions on Instrumentation and Measurement, vol. 53, April 2004, no. 2, pp. 498–506.CrossRefGoogle Scholar
Balanis, C. A., Antenna Theory: Analysis and Design, 2nd edn., John Wiley and Sons, 1997.Google Scholar
Garn, H., Buchmayr, M., and Mullner, W., Tracing Antenna Factors of Precision Dipoles to Basic Quantities, IEEE Transactions on Electromagnetic Compatibility, vol. 40, November 1998, no. 4, pp. 297–310.CrossRefGoogle Scholar
Saito, H., Nagano, I., Yagitani, S., and Haruki, H., Radiation Characteristics of Antenna for a Small Radio Terminal in Vicinity of a Human Body (in Japanese), IEICE Transactions on Communications, vol. J83-B, October 2000, no. 10, pp. 1437–1445.Google Scholar
Uno, T. and Adachi, S., Range Distance Requirements for Large Antenna Measurements, IEEE Transactions on Antennas and Propagation, vol. 37, June 1989, no. 6, pp. 707–720.CrossRefGoogle Scholar
Ida, I., Sekizawa, T., Yoshimura, H., and Ito, K., Dependence of the efficiency-bandwidth product of small dielectric loaded antennas on the permittivity, Proceedings of ISAP 2000, vol. 1, pp. 61–64.
Newman, E. D., Bohley, P., and Walter, C. H., Two methods for measurement of antenna efficiency, IEEE Transactions on Antennas and Propagation, vol. AP-23, 1975, no. 3, pp. 457–461.CrossRefGoogle Scholar
Muramoto, M., Ishii, N., and Itoh, K., Studies of Radiation Efficiency Measurement by Using Wheeler Cap, IEICE Transactions, vol. J-78-B-II, 1995, no. 6. pp. 454–460.Google Scholar
Chao, R. Y., Hirasawa, K., and Fujimoto, K., Wire Antenna Current Distributions within a Wheeler Cap, IEICE Transactions, vol. J71-B, 1988, no. 11, pp. 1370–1372.Google Scholar
Rosengren, K. et al., Characterization of Antennas for Mobile and Wireless Terminals in Reverberation Chambers, Improved Accuracy by Platform Stirring, Microwave and Optical Technology Letters, vol. 30, 2001, pp. 391–397.CrossRefGoogle Scholar
Sugiyama, T., Shinozuka, T., and Iwasaki, K., Estimation of Radiated Power of Radio Transmitter Using a Reverberation Chamber, IEICE Transactons on Communications, vol. E88-B, 2005, no. 8, pp. 3158–3163.CrossRefGoogle Scholar
Kildal, P. S. and Rosengren, R. K., Measurement of Free Space Impedances of Small Antennas in Reverberation Chamber, Microwave and Optical Technology Letters, vol. 32, 2002, pp. 112–115.CrossRefGoogle Scholar

Save book to Kindle

To save this book to your Kindle, first ensure coreplatform@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about saving to your Kindle.

Note you can select to save to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

Find out more about the Kindle Personal Document Service.

Available formats
×

Save book to Dropbox

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Dropbox.

Available formats
×

Save book to Google Drive

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.

Available formats
×