  We investigated the radio spectra of two magnetars, PSR J1622$-$4950 and 1E
1547.0$-$5408, using observations from the Australia Telescope Compact Array
and the Atacama Large Millimeter/submillimeter Array taken in 2017. Our
observations of PSR J1622$-$4950 show a steep spectrum with a spectral index of
$-$1.3 $\pm$ 0.2 in the range of 5.5-45 GHz during its re-activating X-ray
outburst in 2017. By comparing the data taken at different epochs, we found
significant enhancement in the radio flux density. The spectrum of 1E
1547.0$-$5408 was inverted in the range of 43-95 GHz, suggesting a spectral
peak at a few hundred gigahertz. Moreover, we obtained the X-ray and radio data
of radio magnetars, PSR J1622$-$4950 and SGR J1745$-$2900, from literature and
found two interesting properties. First, radio emission is known to be
associated with X-ray outburst but has different evolution. We further found
that the rising time of the radio emission is much longer than that of the
X-ray during the outburst. Second, the radio magnetars may have double peak
spectra at a few GHz and a few hundred GHz. This could indicate that the
emission mechanism is different in the cm and the sub-mm bands. These two
phenomenons could provide a hint to understand the origin of radio emission and
its connection with the X-ray properties.
