작 성 자 관리자
 Part 15.503 of the FCC rules provides the following definitions for UWB operation (application system definitions are omitted) : (a) UWB bandwidth. For the purpose of this subpart, the UWB bandwidth is the frequency band bounded by the points that are 10 dB below the highest radiated emission, as based on the complete transmission system including the antenna. The upper boundary is designated fH and the lower boundary is designated fL. The frequency at which the highest radiated emission occurs is designated fM. (b) Center frequency. The center frequency, fC, equals (fH + fL)/2. (c) Fractional bandwidth. The fractional bandwidth equals 2(fH – fL) / (fH + fL). (d) Ultra-wideband (UWB) transmitter. An intentional radiator that, at any point in time, has a fractional bandwidth equal to or greater than 0.20 or has a UWB bandwidth equal to or greater than 500 MHz, regardless of the fractional bandwidth. (k) EIRP. Equivalent isotropically radiated power, i.e., the product of the power supplied to the antenna and the antenna gain in a given direction relative to an isotropic antenna.
The EIRP, in terms of dBm, can be converted to a field strength, in dBμV/m at 3 meters, by adding 95.2. With regard to this part of the rules, EIRP refers to the highest signal strength measured in any direction and
at any frequency from the UWB device, as tested in accordance with the procedures specified in Part 15.31(a) and 15.523 of the rules.
3   UWB REGULATIONS 관리자 2012.08.22 2491
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