Title :
Pseudo-isotropic source for anechoic chamber qualification
Author :
Wilson, P. ; Ladbury, J. ; Koepke, G.
Author_Institution :
Nat. Inst. of Stand. & Technol., Boulder, CO, USA
Abstract :
A pseudo-isotropic source is presented The source consists of an electrically large cavity with internal excitation (horn antenna), a variable internal boundary condition (a rotating paddle as in a reverberation chamber), and randomly placed apertures for external radiation. On average, the radiation pattern approaches that of an isotropic source. Data are presented for a nonoptimized box realization showing +/- 3 dB isotropy over typical planar cuts. Simulations suggest that better than +/- 2 dB should be possible.
Keywords :
anechoic chambers (electromagnetic); antenna radiation patterns; calibration; electromagnetic compatibility; horn antennas; measurement standards; reverberation chambers; EMC test facility; anechoic chamber qualification; electrically large cavity; external radiation; horn antenna; internal excitation; nonoptimized box realization; pseudo-isotropic source; radiation pattern; randomly placed apertures; reverberation chamber; rotating paddle; variable internal boundary condition; Anechoic chambers; Antenna measurements; Antenna radiation patterns; Apertures; Attenuation measurement; Horn antennas; Qualifications; Receiving antennas; Reflection; Reverberation chamber;
Conference_Titel :
Electromagnetic Compatibility, 2002. EMC 2002. IEEE International Symposium on
Conference_Location :
Minneapolis, MN, USA
Print_ISBN :
0-7803-7264-6
DOI :
10.1109/ISEMC.2002.1032444
