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We study the multi-wavelength spectral properties of the black hole X-raybinary MAXI J1348$-$630 using quasi-simultaneous ALMA, NICER, and Swiftobservations during the decay phase of the January 2019 outburst. In millimeterwavelengths, radio continuum emissions in the frequency range of 89.56$-$351.44GHz are measured. We found that the flux densities at millimeter wavelengthvaried between 12.18 mJy and 18.47 mJy with spectral index ($\alpha$) of$0.28\pm0.02$. The broadband spectrum suggests that the source was accompaniedby weak synchrotron emission from the compact jets. Broadband spectral studyindicates that MAXI J1348$-$630 falls in the regime of "radio-quiet" during thedecay phase of the outburst. The NICER spectrum is fitted by a combined modelof disk blackbody component (diskbb) along with a comptonization component(simpl) which explains the power-law continuum caused by the thermalComptonisation of soft disk photons in a hot gas of electrons. The NICERspectrum is dominated by the comptonised components during the decay phase ofthe outburst close to the hard state of the source. We have investigated thecorrelation between X-ray and radio luminosity using quasi-simultaneous ALMAand NICER data to understand the source nature by locating the source in the$L_X$-$L_R$ diagram. The correlation study of radio/X-ray luminosity suggeststhat MAXI J1348$-$630 did not follow the well-known track for black holes andit is a new member of a restricted group of sources.

Multi-wavelength observation of MAXI J1348$-$630 during the outburst in 2019