Attenuation CABLE/CONNECTOR DIELECTRIC MATERIALS α�= ( k1 x √ f(MHz) + (k2 x f(MHz)) (dB/100ft) Dielectric Constant (Nominal) Material Wavelength Temperature Ranges (°C) Air 1.00 Solid PTFE 2.10 -75 to +250 Low Density PTFE 1.60 -75 to +250 Cellular TFE 1.40 -75 to +250 PFA 2.10 -75 to +260 Characteristic Impedance Flouroloy H. 2.43 -75 to +204 D Zo = 60 x Vp x In ( d ) (ohms) PE 2.30 -65 to +85 Foam PE 1.46 -95 to +100 Boron Nitride 4.00 -75 to +1800 11.8021 x Vp λ= (in) f(GHz) Length Given Delay L = .9835 x T x Vp (ft) Cut Off Frequency fco = 7.51 x Vp (GHz) D+d d D TYPICAL AVERAGE POWER DERATING FACTORS Temp °C Derating Factor Altitude x 1000 ft Derating Factor 0 1.20 0 1.00 Phase Length 40 1.00 20 .80 φ = 30.5 x L(in) x f(GHz) Vp 80 .80 30 .70 120 .60 40 .60 160 .40 50 .50 200 .20 60 .40 240 .05 70 .30 Time Delay T = 1.016 (ns/ft) Vp Capacitance C(pF/ft) = 16.97 Vp2 ln D d Velocity of Propagation Vp = 1 √Er TRU Corporation 245 Lynnfield Street, Peabody, MA 01960 1-800-COAX-TRU (1-800-262-9878) www.trucorporation.com