Dipoles
1) electric dipole - is the separation of a negative charge from a positive. 2) magnetic dipole - the closed circuit of an electric current system.
See Also: Dipole Antennas, Dipole Reference Antennas, Precision Dipole Antennas
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Field Strength Meter
FIM-72A UHF
The Model FIM-72A is a portable, laboratory quality Field Strength Meter designed for rigorous field applications. Combining a calibrated half-wave dipole antenna and a highly accurate tuned voltmeter with a range of 140 dB, the FIM-72A is suitable for practically all types of RF emission measurements in the 450 MHz to 960 MHz spectrum. The operator can switch select wide or narrow bandwidth, peak or average value of TV or pulse modulated signals, AM or FM demodulation, and meter dynamic range of either 20 dB or 60 dB. A dc analog voltage, proportional to meter indication, is provided for driving a chart recorder or similar device. A leveled output from the calibrating generator is available for measuring cable insertion loss, filter response, amplifier gain, VSWR, and other signal ratio measurements. The 4-1/2 inch, taut band, mirrored scale meter is calibrated in volts and dB for precise measurements in field or laboratory environments.
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Precision Conical Dipole
PCD 8250
Exposure evaluation next to mobile communication facilities e.g. GSM and UMTS base stations. Accurate RF radiation safety measurements e.g. nearby broadcast stations or in buildings. All kinds of field strength measurements where high precision, a wide frequency range and small antenna dimensions are required. Measurements according to our Field Nose method. Frequency range: 80 MHz 3 GHz
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Biconical Antennas
For many years most standards called for the use of a half-wave dipole antenna set for frequencies above 80 MHz. However, to reduce test time, broadband antennas such as the biconical antenna and log periodic antennas began to be accepted. Broadband antennas, compared to half wave dipoles, reduce test time because the technician did not have to stop the test to adjust the dipole antenna for each frequency. A.H. Systems'' 7 models of Biconical Antennas operate efficiently over the frequency range of 20 MHz to 18 GHz. Suitable for FCC, MIL-STD, VDE, TEMPEST, and immunity testing, each Biconical antenna will provide reliable, repeatable measurements.
