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We have studied the linear polarization of 86 active galactic nuclei (AGN) inthe observed frequency range 80-267 GHz (3.7-1.1mm in wavelength),corresponding to rest-frame frequencies 82-738 GHz, with the IRAM Plateau deBure Interferometer (PdBI). The large number of measurements, 441, makes ouranalysis the largest polarimetric AGN survey in this frequency range to date.We extracted polarization parameters via earth rotation polarimetry withunprecedented median precisions of ~0.1% in polarization fractions and ~1.2degrees in polarization angles. For 73 of 86 sources we detect polarization atleast once. The degrees of polarization are as high as ~19%, with the medianover all sources being ~4%. Source fluxes and polarizations are typicallyhighly variable, with fractional variabilities up to ~60%. We find that BLLacsources have on average the highest level of polarization. There appears to beno correlation between degree of polarization and redshift, indicating thatthere has been no substantial change of polarization properties since z~2.4.Our polarization and spectral index distributions are in good agreement withresults found from various samples observed at cm/radio wavelengths; thus ourfrequency range is likely tracing the signature of synchrotron radiationwithout noticeable contributions from other emission mechanisms. The"millimeter-break" located at frequencies >1 THz appears to be not detectablein the frequency range covered by our survey.

The First IRAM/PdBI Polarimetric Millimeter Survey of Active Galactic Nuclei. I. Global Properties of the Sample