公开(公告)号：JP2002110053A

公开(公告)日：2002-04-12

申请号：JP2001235663

申请日：2001-08-03

Applicant: LUCENT TECHNOLOGIES INC

Inventor： GOREN YEHUDA ,  JIN SUNGHO ,  KOCHANSKI GREGORY P ,  ZHU WEI

IPC: H01J9/02 ,  H01J21/10 ,  H01J23/04 ,  H01J23/06

Abstract: PROBLEM TO BE SOLVED: To provide an improved gridded microwave tube equipped with a cold cathode, an anode, and a grid disposed between the anode and the cathode. SOLUTION: In one embodiment, the cold cathode has a refractory metal substrate and carbon nanotube emitters of 1 to 300 nm in diameter and 0.05 to 100 μm in length. The grid-cathode spacing is 1 to 100 μm. The grid has apertures of 0.5 to 100 μm in maximum size, and the thickness of the grid is 0.5 to 100 μm. Direct emission from the cathode to the grid material itself, which undesirably heats up the grid, is reduced either by; (a) providing a shadow mask between the grid and the emitters, or by; (b) selectively forming emitters in positions corresponding to the grid apertures. This microwave tube works at frequencies higher than 0.5 GHz, and it is advantageous to work at frequencies higher than 2 GHz.

公开(公告)号：CA2351037A1

公开(公告)日：2002-02-04

申请号：CA2351037

申请日：2001-06-19

Applicant: LUCENT TECHNOLOGIES INC ,  TELEDYNE TECH INC

Inventor： GOREN YEHUDA ,  JIN SUNGHO ,  KOCHANSKI GREGORY P ,  ZHU WEI

IPC: H01J9/02 ,  H01J21/10 ,  H01J23/04 ,  H01J23/06 ,  H01J29/06 ,  H03F3/189

Abstract: An improved gridded microwave tube is provided, the tube containing a cold cathode, an anode, and a grid located between the anode and cathode. In one embodiment, the cold cathode has a refractory metal substrate and carbon nanotube emitters, the emitters having a diameter of 1 to 300 nm and a length of 0.05 to 100 .mu.m. The grid-cathode spacing is 1 to 100 .mu.m, the grid contains apertures having a maximum dimension of 0.5 to 100 .mu.m, and the grid thickness is 0.5 to 100 .mu.m. Emission from the cathode directly onto the grid material itself, which undesirably heats the grid, is reduced by either (a) the presence of a shadow mask between the grid and the emitters or (b) selective formation of the emitters in locations that correspond to the grid apertures. The microwave tube operates at a frequency of greater than 0.5 GHz, advantageously greater than 2 GHz.

公开(公告)号：CA2351037C

公开(公告)日：2004-03-23

申请号：CA2351037

申请日：2001-06-19

Applicant: LUCENT TECHNOLOGIES INC ,  TELEDYNE TECH INC

Inventor： JIN SUNGHO ,  GOREN YEHUDA ,  KOCHANSKI GREGORY P ,  ZHU WEI

IPC: H01J9/02 ,  H01J21/10 ,  H01J23/04 ,  H01J23/06 ,  H01J29/06 ,  H03F3/189

Abstract: An improved gridded microwave tube is provided, the tube containing a cold cathode, an anode, and a grid located between the anode and cathode. In one embodiment, the cold cathode has a refractory metal substrate and carbon nanotube emitters, the emitters having a diameter of 1 to 300 nm and a length of 0.05 to 100 .mu.m. The grid-cathode spacing is 1 to 100 .mu.m, the grid contains apertures having a maximum dimension of 0.5 to 100 .mu.m, and the grid thickness is 0.5 to 100 .mu.m. Emission from the cathode directly onto the grid material itself, which undesirably heats the grid, is reduced by either (a) the presence of a shadow mask between the grid and the emitters or (b) selective formation of the emitters in locations that correspond to the grid apertures. The microwave tube operates at a frequency of greater than 0.5 GHz, advantageously greater than 2 GHz.