An emission and reception assembly for a multibeam antenna, the antenna further including a communication module, the assembly comprising: - a plurality of radiating elements (32A,...,32F) forming a radiating surface, each radiating element (32A,...,32F) being capable of emitting and receiving electromagnetic signals downstream from the radiating surface; - an emission distribution network arranged upstream from the radiating surface and including a plurality of emission ports, each emission port being connected to a radiating element (32A,...,32F) by an emission waveguide (45A,...,45F) and able to emit, via the corresponding radiating element (32A,...,32F), an electromagnetic signal formed from an electromagnetic signal coming from the communication module; - a reception distribution network arranged upstream from the radiating surface and including a plurality of reception ports (50A, 50B), a plurality of low-noise amplifiers (55A, 55B, 55C) and means for interconnecting each reception port (50A, 50B, 50C) to at least one low-noise amplifier, each reception port (50A, 50B, 50C) being connected to a radiating element (32A,...,32F) by a reception waveguide (47A,...,47F) and able to receive each electromagnetic signal coming from the corresponding radiating element (32A,...,32F) and to send it to the associated low-noise amplifier (55A, 55B, 55C) to obtain an amplified electromagnetic signal intended for the communication module; the reception distribution network and the radiating elements (32A,...,32F) being thermally decoupled, characterized in that the emission distribution network and the reception distribution network are distinct from one another and are arranged in a same housing distinct from the communication module; and in that the reception waveguides (47A,...,47F) are made from a thermally insulating material capable of thermally insulating the low-noise amplifiers (55A, 55B, 55C) from the radiating elements (32A,...,32F). - a plurality of radiating elements (32A,...,32F) forming a radiating surface, each radiating element (32A,...,32F) being capable of emitting and receiving electromagnetic signals downstream from the radiating surface; - an emission distribution network arranged upstream from the radiating surface and including a plurality of emission ports, each emission port being connected to a radiating element (32A,...,32F) by an emission waveguide (45A,...,45F) and able to emit, via the corresponding radiating element (32A,...,32F), an electromagnetic signal formed from an electromagnetic signal coming from the communication module; - a reception distribution network arranged upstream from the radiating surface and including a plurality of reception ports (50A, 50B), a plurality of low-noise amplifiers (55A, 55B, 55C) and means for interconnecting each reception port (50A, 50B, 50C) to at least one low-noise amplifier, each reception port (50A, 50B, 50C) being connected to a radiating element (32A,...,32F) by a reception waveguide (47A,...,47F) and able to receive each electromagnetic signal coming from the corresponding radiating element (32A,...,32F) and to send it to the associated low-noise amplifier (55A, 55B, 55C) to obtain an amplified electromagnetic signal intended for the communication module; the reception distribution network and the radiating elements (32A,...,32F) being thermally decoupled, characterized in that the emission distribution network and the reception distribution network are distinct from one another and are arranged in a same housing distinct from the communication module; and in that the reception waveguides (47A,...,47F) are made from a thermally insulating material capable of thermally insulating the low-noise amplifiers (55A, 55B, 55C) from the radiating elements (32A,...,32F).