Electron Beam RF Amplifier And Emitter

• US 20090114839A1
• Filed: 10/31/2008
• Published: 05/07/2009
• Est. Priority Date: 06/23/2003
• Status: Active Grant

• Current Assignee: Robert E. Lechevalier
• Original Assignee: Robert E. Lechevalier
• Inventors: LeChevalier, Robert E.
• Granted Patent: US 7,671,687 B2
• Time in Patent Office: Days
• US Class Current: 250/396.R
• CPC Class Codes: H01J 21/24 with variable amplification factor
• CPC Class Codes: H01J 3/36 Arrangements for controlling the ray or beam after passing the main deflection system, e.g. for post-acceleration or post-concentration

Abstract

RF field is sensed to produce an incoming voltage that drives a microarray of electron guns in a sweep pattern towards a detector array. The electron guns emit a beam current that may amplify the incoming voltage signal, and the detector material may be selected to amplify the beam current at the detector, for example, by avalanche and/or cascade in a Schottky material, to provide a low current, high gain amplification. The microarrays may be arranged in various combinations to produce successive amplifications, frequency multipliers, transmit-receive amplifiers, crossbar switches, mixers, beamformers, and selective polarization devices, among other such devices.

Claims

1. A method of amplifying a deflection signal made of one or more voltage signals, the method comprising

emitting a plurality of electron beamlets from an array of electron guns such that the beamlets traverse an electron transmission pathway through an evacuated drift cavity defined by an emission wall and a detector wall, each electron beamlet having a corresponding beamlet deflector operably positioned for deflection of the electron beamlet in the drift cavity.

operating the beamlet deflectors to deflect the respective electron beamlets according to receipt of a deflection signal such that an aggregate of emitted beamlets forms an electron beam positioned relative to the transmission pathway, the electron beam forms a beam spot on the detector wall where

in a quiescent state of the deflection signal the electron beam is transmitted on the transmission pathway in a non-deflected mode, and

in a non-quiescent state of the deflection signal the electron beam deflector deflects the electron beam in a swept mode of sweeping action that moves the beam spot along a sweep pathway at the detector wall;

and

generating an output current by interaction of the electron beam and the detector.

2. The method of claim 1, wherein the step of generating includes rendering the output current is representative of the deflection signal but amplified with respect to the deflection signal by virtue of interaction between the detector, the beam spot and the detector construction.

3. The method of claim 1, further comprising operating an electrostatic lens system to achieve simultaneous action upon a plurality of beamlets emitted by the array of electron guns.

4. The method of claim 1 wherein the detector has one or more segments;

and a perimeter of any of the one or more segments is shaped by complementary design with respect to the beam spot, and the method further comprises improving linearity of the output current in response to the deflection signal by interaction of the beam spot and the detector.

5. The method of claim 1 where the detector has more than two segments arranged in a first group and a second group where individual segments of the first group and the second group are intercolated in alternating order sequentially between segments of the first group and the second group;

the first group being coupled to a positive detector output, and the second group being coupled to a negative detector output; and

the method further comprises applying the deflection signal as an alternating signal with an amplitude that is operable to sweep the beam spot across the segments to accomplish frequency multiplication.

6. The method of claim 1, further comprising a step of applying the output signal to an antenna.