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An accurate method to measure the antenna impedance of a portable radio
Author(s) -
Chow Y. L.,
Tsang K. F.,
Wong C. N.
Publication year - 1999
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/(sici)1098-2760(19991220)23:6<349::aid-mop8>3.0.co;2-k
Subject(s) - balun , ground plane , antenna (radio) , monopole antenna , microwave , electrical engineering , electrical impedance , engineering , acoustics , measure (data warehouse) , antenna tuner , dipole antenna , physics , coaxial antenna , telecommunications , computer science , database
Traditional impedance measurement of a monopole antenna is inaccurate due to a likely stray radiating current on the measuring cable that is also affected by the operating human. This letter demonstrates experimentally that the elimination of this stray current is possible by using a special sleeve balun suitable for varied PCB ground‐plane and human postures. Adjustment of the balun position is discussed. ©1999 John Wiley & Sons, Inc. Microwave Opt Technol Lett 23: 349–352, 1999.