Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1999-04-02
2000-12-26
Lee, Benjamin C.
Communications: electrical
Condition responsive indicating system
Specific condition
340 101, 343754, 343793, 343795, 342360, G08B 1314
Patent
active
061666386
ABSTRACT:
An RF/ID transponder comprises an integrated circuit package including at least a memory and an RF modulator. A dipole antenna is coupled to the RF modulator, and has a length greater than one-half wavelength of an electromagnetic wave having a nominal frequency within an operating frequency band of the RF modulator. A base plate provides an electrically conductive ground plane, and a housing is attached to the base plate. The integrated circuit package and the dipole antenna are supported by the housing at a predetermined distance from the conductive ground plane. Thereby, the dipole antenna provides a radiation pattern that includes at least first and second squinted beams extending at respective acute angles relative to a vector defined normal to the conductive ground plane, and at least one center beam extending along the vector defined normal to the conductive ground plane. In a preferred embodiment of the invention, the length of the dipole antenna is approximately one and one-half wavelengths at the nominal frequency, and the housing supports the dipole antenna above the conducting ground plane at a distance of approximately 6 to 12 percent of a wavelength of the nominal frequency.
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"Horizontal Antennas Above Real Ground" by Ralph Holland, Amateur Radio 1996.
"Horizontal Half-Wave Dipole Above A Counterpoise" by Ralph Holland, Amateur Radio 1996.
"Linear Antenna": far-field pattern of 1.5 lambda center-fed dipole antenna (Figure 14-27b), John D. Kraus, Electromagnetics, 3rd edition, copyright 1987 by McGraw-Hill, Inc. pp. 657-658.
Brady Michael John
Duan Dah-Weih
Intermec IP Corp.
Lee Benjamin C.
LandOfFree
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