Biconical antennas are used for emissions and immunity testing to meet various EMC standards specified by FCC, CISPR and EN. The broadband characteristics of the biconical antenna make it a good choice for making sweep measurements and for automated measurement systems. Normally, tuned dipole antennas are used for EMC site attenuation measurements for better accuracy. However, the biconical antenna is easier to use for vertical site attenuation measurements, because of the long dipole element lengths at lower frequencies (5 meters at 30 MHz).
According to ANSI 63.4 specification, calibrated biconical, and a log periodic antennas can be used for site attenuation measurements. The calibration data provided with each antenna is used to calculate field strength measured for the selected frequency. The antenna factor (dB/m) is added to the measured output (dBV) displayed by the EMI meter to obtain field strength (dBV/m).
The microwave biconical antenna is a precisely tuned, linearly polarized, mini-biconical dipole antenna, operating at the low end of the microwave band over the frequency range of 1 to 6 GHz. It may be used as either a transmitting or receiving antenna. The microwave biconical antenna (such as Com-Power's ABM-6000) was specifi cally designed to comply with radiation pattern specifi cations detailed in CISPR 16-1-4(section 8.2.2.1), and is intended to be used as the transmit source antenna for site validations above 1 GHz for radiated emissions test sites, such as OATS (open area test sites), anechoic and semi-anechoic chambers.
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