The C1-A60 series of couplers are designed for 400-13000 MHz primarily for test set applications where a combination of high performance specifications are required for broadband, High Power, exceptional PIM, coupling flatness including fine grain flatness over 20 MHz bandwidths, and mainline spurious free performance up to 13 GHz. A patented suspended tapered airline coupler design was created to accomplish this combination of performance specifications Primary popular coupling values of 10,20, 30 dB, and custom 6 and 8 dB values are also available.