Reivindicaciones
1. A wideband and broadband radio-frequency bidirectional coupler with power divider/combiner functionality (200A, 200B, 300, 400A, 400B, 400C) for signals with frequency reaching up to 300 GHz, comprising: - a free propagation region substrate (210) with a pair of opposed edges (240A, 240B); - a first group of access ports (P-L1 - P-LM) established along a first edge (240A) of said pair of opposed edges (240A, 240B) ; and - a second group of access ports (P-R1 - P-RM) established along a second edge (240B) of said pair of opposed edges (240A, 240B), wherein the first and second groups of access ports (P-L1 - P-LM), (P-R1 - P-RN) comprise: dielectric waveguide structures (DW-L1 - DW-LM), (DW-R1 - DW-RN) providing a high-pass filter transfer function operating over a high frequency range starting from a low cut-off frequency fCL in the microwave range or in the millimeter-wave range. 2. The ultra-wideband radiofrequency bidirectional coupler (200A, 200B, 300, 400A, 400B, 400C) according to claim 1, wherein the first edge (240A) of said pair of opposed edges is shaped as an arc of a circle with radius r1 whose center OA is located closer to the second edge (240B). 3. The ultra-wideband radiofrequency bidirectional coupler (200A, 200B, 300, 400A, 400B, 400C) according to claim 2, wherein the second edge (240B) of said pair of opposed edges is shaped as an arc of a second circle with radius r2 whose center OB is located closer to the first edge (240A). 4. The ultra-wideband radiofrequency bidirectional coupler (200A, 200B, 300, 400A, 400B, 400C) according to claim 3, wherein r1 = r2. 5. The ultra-wideband radiofrequency bidirectional coupler (200A, 200B, 300, 400A, 400B, 400C) according to claims 1 to 4, further comprises a plurality of arms, wherein the plurality of arms allocates the first group of access ports (P-L1 - P-LM) and the second group of access ports (P-R1 - P-RN). 6. The ultra-wideband radiofrequency bidirectional coupler (300) according to claims 1 to 5, wherein the dielectric waveguide structures (DW-L1 - DW-LM), (DW-R1 - DW-RN) are established on top of the free propagation region substrate (310). 7. The ultra-wideband radiofrequency bidirectional coupler (400A, 400B) according to claims 1 to 5, wherein the dielectric waveguide structures (DW-L1 - DW-LM), (DW-R1 - DW-RN) are embedded in the free propagation region substrate (310). 8. The ultra-wideband radiofrequency bidirectional coupler (200B, 300) according to any of the previous claims, wherein the dielectric waveguide structures (DW-L1 - DW-LM), (DW-R1 - DW-RN) comprise tapered ends with a defined tapering profile, and wherein the first and second group of access ports (P-L1 - P-LM), (P-R1 - P-RN) further comprise tapered slot antennas (TSA-L1 - TSA-LM), (TSA-R1 - TSA-RN) providing a band-pass filter transfer function, operating over a low frequency range up to a high cut-off frequency fCH in the millimeter wave range, wherein the tapered slot antennas (TSA-L1 - TSA-LM), (TSA-R1 - TSA-RN) comprise a TSA tapering profile (300a, 300b, 300c), wherein the first tapered end of the dielectric waveguide structures (DW-L1 - DW-LM), (DW-R1 - DW-RN) lies between the tapered slot antennas (TSA-L1 - TSA-LM), (TSA-R1 - TSA-RN), wherein the TSA tapering profile (300a, 300b, 300c) matches the DW tapering profile. 9. The ultra-wideband radiofrequency bidirectional coupler (200B) according to claim 8, wherein the TSA tapering profile (300a) and the DW tapering profile are linear tapered. 10. The ultra-wideband radiofrequency bidirectional coupler (200B) according to claim 8, wherein the TSA tapering profile (300b) and the DW tapering profile are exponential tapered. 11. The ultra-wideband radiofrequency bidirectional coupler (200B) according to claim 8, wherein the TSA tapering profile (300c) and the DW tapering profile are FERMI tapered. 12. The ultra-wideband bidirectional coupler (700) according to any of the preceding claims that further comprises: - a low-frequency directional coupler (750) with operating frequency range starting at DC or from a low-frequency in the kilohertz range and reaching up to a low cut-off frequency fDCH in the millimeter wave range, - wherein fDCH > a low cut-off frequency of dielectric waveguide structures, fCL; - a plurality of transmission lines (720) and waveguide transitions that connect the low-frequency directional coupler (750) and the tapered slot antennas (TSA-L1 - TSA-LM), (TSA-R1 - TSA-RN) for a combined operating frequency range up to fCH. 13. The ultra-wideband bidirectional coupler (300) according to claims 6 or 7, comprising: - Two first access ports (P-L1 - P-L3) along the at least one edge of said free propagation region substrate (310) comprising dielectric waveguide structures (DW-L1 - DW-L3) having tapered ends, - Two second access ports (P-R4 - P-R2) along the opposite edge of said free propagation region substrate (310) comprising dielectric waveguide structures (DW-R4 - DW-R2) having tapered ends, - wherein a tapered end of the dielectric waveguide structure (DW- L1) points toward a tapered end of the dielectric waveguide structure (DW-R2), - wherein a tapered end of the dielectric waveguide structure (DW-R4) points towards a tapered end of the dielectric waveguide structure (DW-L1), and - wherein a tapered end of the dielectric waveguide structure (DW-L3) points towards a tapered end of the dielectric waveguide structure (DW-R2). 14. The ultra-wideband bidirectional coupler (300) according to claim 13, wherein the dielectric waveguide structures (DW-L1 - DW-L3), (DW-R2 - DW-R4) comprise a DW tapering profile, and further comprises tapered slot antennas (TSA-L1 - TSA-L3), (TSA-R2 - TSA-R4) providing a low-pass characteristic interconnect, operating over a low frequency range up to a high cut-off frequency fCH in the millimeter wave range, wherein the tapered slot antennas (TSA-L1 - TSA-L3), (TSA-R2 - TSA-R4) comprise a TSA tapering profile (300a, 300b, 300c) around a first tapered end of the dielectric waveguide structures (DW-L1 - DW-L3), (DW-R2 - DW-R4) wherein the TSA tapering profile (300a, 300b, 300c) matches the DW tapering profile. 15. The ultra-wideband radiofrequency bidirectional coupler (400A, 400C) according to claims 1 to 7, wherein the dielectric waveguide structures (DW-L1 - DW-LM), (DW-R1 - DW-RN) comprise at least one truncated end. 16. The ultra-wideband bidirectional coupler (200A, 200B, 300, 400A, 400B, 400C) according to any of the preceding claims, wherein the free propagation region substrate (310) has a different permittivity than the dielectric waveguide structures (DW-L1 - DW-LM), (DW-R1 - DW-RN). 17. The ultra-wideband bidirectional coupler (200A, 200B, 300, 400A, 400B, 400C) according to any of the preceding claims, wherein the free propagation region substrate (310) comprises absorbers. 18. The ultra-wideband bidirectional coupler (400C) according to claims 1 to 3, wherein the free propagation region substrate (310) comprises dielectric material. 19. The ultra-wideband bidirectional coupler (200A, 200B, 300, 400A, 400B, 400C) according to any of the preceding claims, wherein the arc of the circle for the first group of access ports (P-L1 - P-LM) is equal to the radius r2 of the arc of the second circle; and wherein the centers (OA, OB) of the two circles and are radially aligned.
