We present a new image of the 9.0 GHz radio emission from the extended Chandra Deep Field South .
A total of 181 hours of integration with the Australia Telescope Compact Array has resulted in a 0.276 square degree image with a median sensitivity of \sim 20 \mu Jy/beam rms , for a synthesised beam of 4.0 \times 1.3 arcsec .
We present a catalogue of the 9.0 GHz radio sources , identifying 70 source components and 55 individual radio galaxies .
Source counts derived from this sample are consistent with those reported in the literature .
The observed source counts are also generally consistent with the source counts from simulations of the faint radio population .
Using the wealth of multiwavelength data available for this region , we classify the faint 9 GHz population and find that 91 % are radio loud AGN , 7 % are radio quiet AGN and 2 % are star forming galaxies .
The 9.0 GHz radio sources were matched to 5.5 and 1.4 GHz sources in the literature and we find a significant fraction of flat or inverted spectrum sources , with 36 % of the 9 GHz sources having \alpha _ { 5.5 GHz } ^ { 9.0 GHz } > -0.3 ( for S \propto \nu ^ { \alpha } ) .
This flat or inverted population is not well reproduced by current simulations of radio source populations .