A new and improved radio frequency coaxial connector mounting flange structure, to be mounted upon a radio frequency system subassembly, comprises a modular component which has recessed end portions for enabling adjacent coaxial connector mounting flange structures to effectively overlap each other, when a plurality of the coaxial connector mounting flange structures are disposed within a longitudinal, horizontally oriented array, such that not only can the longitudinal extent of the longitudinal array of the plurality of coaxial connector mounting flange structures be minimized, but in addition, the overall longitudinal extent of the radio frequency system subassembly can be reduced. Still further, the overlapped end portions of the adjacent coaxial connector mounting flange structures can effectively be secured onto the radio frequency system subassembly by a common fastener thereby effectively reducing the number of fasteners and the corresponding time to install such fasteners.