| 摘要 |
1353650 Transformers TECHNICAL MANAGEMENT SERVICES Inc 19 April 1971 [27 Jan 1970] 47155/73 Divided out of 1353648 Heading HIT A transformer has a magnetic core and a winding of coaxial cable with impedances matched to the characteristic impedance of the cable connected between the shield and the internal conductor. As shown, the transformer has a toroidal core constructed of a spiral of a thin strip of high permeability magnetic material 270. The tape may be 0À002 inches thick. A conductive aluminium shield 272 in two halves 274, 276 surrounds the core and is insulated therefrom. The coaxial cable 278 forms a combined drive and sense winding and is terminated by resistors 284, 286 equal to the characteristic impedance of the line. Isolation between shield and internal conductor is by series LC circuit 290, 288 which presents a short circuit at the cable resonant frequency and a high impedance at operating frequency. The secondaries may comprise a plurality of windings with 1, 2, 4 ... 2<SP>n</SP> torrs and can be joined by FET switches to vary the output voltage. |
