A ultra-wideband interconnection probe connectable to a first access port (P1) of a first electronic device located on a first substrate , the first access port comprising a first tapered coupler and to a second access port (P2) of a second electronic device located on a second substrate , the second access port comprising a second tapered coupler , the ultra-wideband interconnection probe comprising: - a dielectric waveguide structure with a high-pass filter characteristic, enabling the electrical interconnection for signals with frequencies above a low cut-off frequency f CL in the microwave range or in the millimeter-wave range, characterized in that the dielectric waveguide structure comprises: - a first tapered end connectable to a first access port (P1) of the electronic device via the first tapered coupler , the first tapered end being configured to be placed above the first tapered coupler and matched to the first tapered coupler in terms of field emission phase-center for all the frequencies of interest; and - a second tapered end connectable to the second access port (P2) of the electronic device via the second tapered coupler , the second tapered end being configured to be placed above the second tapered coupler and matched to the second tapered coupler in terms of field emission phase-center for all the frequencies of interest wherein the first access port (P1) is configured to inject electromagnetic wave signals and the second access port (P2) is configured to observe said signals via the ultra-wideband interconnection probe which behaves as a transmission line for a wide range of frequencies. - a dielectric waveguide structure with a high-pass filter characteristic, enabling the electrical interconnection for signals with frequencies above a low cut-off frequency f CL in the microwave range or in the millimeter-wave range, characterized in that the dielectric waveguide structure comprises: - a first tapered end connectable to a first access port (P1) of the electronic device via the first tapered coupler , the first tapered end being configured to be placed above the first tapered coupler and matched to the first tapered coupler in terms of field emission phase-center for all the frequencies of interest; and - a second tapered end connectable to the second access port (P2) of the electronic device via the second tapered coupler , the second tapered end being configured to be placed above the second tapered coupler and matched to the second tapered coupler in terms of field emission phase-center for all the frequencies of interest - a first tapered end connectable to a first access port (P1) of the electronic device via the first tapered coupler , the first tapered end being configured to be placed above the first tapered coupler and matched to the first tapered coupler in terms of field emission phase-center for all the frequencies of interest; and - a second tapered end connectable to the second access port (P2) of the electronic device via the second tapered coupler , the second tapered end being configured to be placed above the second tapered coupler and matched to the second tapered coupler in terms of field emission phase-center for all the frequencies of interest wherein the first access port (P1) is configured to inject electromagnetic wave signals and the second access port (P2) is configured to observe said signals via the ultra-wideband interconnection probe which behaves as a transmission line for a wide range of frequencies. <EOS>