Radio frequency pulse transmitters
AssigneeDecca Record Company Ltd.
InventorWilliam Joseph O'Brien
Life of this patent
Estimating the term…
Abstract
In a high power transmitter, more particularly a pulsed transmitter for a phase comparison navigation system, a plurality of solid state current control units are connected to respective separate sections of a primary inductance unit, these sections together forming a primary coupled to a secondary winding in the antenna circuit. The solid state control units may for example be switching units for timed switching of previously charged capacitors into resonant circuits. Switch controlled damping means may be provided for the tank circuits and antenna circuit in a pulse transmitter. Coil constructions are described permitting of the use of a large number of primary coil sections with separate current control units.
Claims33
A radio frequency power output device comprising a primary inductance unit including a coil formed of a plurality of similar adjacent windings inductively coupled to constitute a single primary inductance unit, a plurality of solid state current control units, means connecting each control unit directly to the ends of a respective associated winding, the current control units being located adjacent the respective windings with said connecting means disposed in pairs adjacent one another to cancel the fluxes produced by the currents in said connecting means, timing means arranged for operating said current control units simultaneously, capacitor means coupled to each of said adjacent windings by a respective current control unit to make said primary inductance unit resonant at a predetermined frequency when the control units are conductive, and a radio frequency power output circuit including a secondary winding coupled to all the windings of said primary inductance unit and tuned to said predetermined frequency.
A radio frequency pulse generator comprising a primary circuit tuned to a given frequency and having a plurality of units forming a multiplex primary, each unit including a winding connected in series with a primary capacitor and a solid state switch;
- a tuned secondary circuit coupled to said multiplex primary and tuned to said given frequency;
- and operating means connected to said solid state switches arranged to operate said switches simultaneously to discharge each of said primary capacitors through the associated solid state switch to product an oscillatory current in the primary circuit and hence in the secondary circuit.
A radio frequency power output device comprising a primary inductance unit comprising a plurality of coupled primary windings, a plurality of capacitors each associated respectively with a primary winding, a plurality of switch means connected to said capacitors and primary windings and operative to connect each capacitor and its associated winding together to form a resonant circuit, means for charging said capacitors, a secondary circuit coupled to all of said primary windings and timing means arranged to operate said switch means simultaneously to discharge each capacitor into its associated winding and thereby produce an oscillatory discharge in each of said resonant circuits, whereby an oscillatory discharge is produced in the secondary circuit with the maximum voltage building up in successive cycles after the initial discharge of the capacitors to a maximum with a delay of a predetermined number of cycles dependent on the coupling coefficient between the primary windings and secondary circuit.
Dependencies are inferred from the claim text.