The invention relates to a novel transmitting and receiving assembly, and belongs to the technical field of UHF-band phased array radar support equipment. The novel transmitting and receiving assembly is composed of an assembly shell, a phase step filter and the like, and is characterized in that the phase step filter is directly milled on a bottom board of the assembly shell, and radiating fins are milled at the back of the bottom board; the phase step filter is milled at the position of a power output port of the assembly and integrated with the bottom board of assembly into a whole body, an input port of the phase step filter is reserved, the input port is connected with a 3dB bridge of a transmitting and receiving switch assembly when the phase step filter is installed, and an output port of the phase step filter is connected with the power output port of the assembly. Corresponding requirements of military equipment are met by combining the phase step filter, a transmitting power amplifier and the transmitting and receiving switch assembly. Installation of a high-power filter on an antenna array is not required, the quantity of antenna array devices and cables is reduced, and the design quality and the production efficiency are improved. The novel transmitting and receiving assembly solves problems that the quantity of devices is huge, the devices are scattered in distribution, the quantity of cables increases in a multiplied manner and design and production are difficult to perform because of installation of a high-power filter on the antenna array in the prior art.