Title:
【発明の名称】近接したカソードおよび非放出性グリッドを有する高周波数真空管
Document Type and Number:
Japanese Patent JP2857583
Kind Code:
B2
Abstract:
A vacuum tube for handling an r.f. signal having a predetermined frequency range comprises a linear electron beam emitting cathode (136), a heater (166) and a non-electron emissive current modulating grid (138). The grid (138) is positioned from the cathode (136) by the distance an emitted electron from the cathode (136) can travel in a quarter cycle of the r.f. signal. Outer (202) and inner (204) coaxial metal tubes forming a resonant line of a signal coupler (143) are respectively connected to the grid (138) and cathode (136) so electrons passing through the grid (138) are in bundles in an interaction region (20) between an accelerating anode (18) and the grid (138). Ferrite tiles (42) absorb r.f. fields in the interaction region (20). In one embodiment a signal coupling loop (12) is between metal tubes (202,204) at an end of the tubes spaced 3 lambda /4 from the grid (138) and cathode (136). In a second embodiment the coupler (143) includes a low voltage coaxial line (110) having an inner conductor (112) connected to a first metal face (125), spaced from a second opposed metal (134) face by a solid dielectric (140). The coaxial outer conductor (114) is connected to a third metal face (128), spaced from a fourth opposed metal face (142) by the solid dielectric (140). The third (128) and fourth (142) faces surround the first (125) and second (134) faces. The first (115) and third (128) faces are at DC ground potential while the second (134) and fourth (142) faces are at high negative DC voltages. The second (134) and fourth (142) faces are respectively at common ends of interior (204) and exterior (202) coaxial metal tubes forming a lambda /2 coupler (143). Other ends of the tubes (202,204) are connected to the cathode (136) and grid (138). Bias leads (190,194) for the grid (138) and cathode (136) are connected to the exterior (202) and interior (204) tubes at positions lambda /4 from the grid (138) and cathode (136), while a heater lead (196) goes through the interior tube (204) at a position lambda /4 from the grid (138) and cathode (136).
Inventors:
MERURARUDO BII SHUREEDAA
Application Number:
JP14246394A
Publication Date:
February 17, 1999
Filing Date:
June 01, 1994
Export Citation:
Assignee:
KOMYUNIKEISHONZU ANDO PAWAA IND INC
International Classes:
H01J25/00; H01J23/00; H01J23/065; H01J23/12; H01J23/14; H01J23/207; H01J23/36; H01J23/46; H01J23/54; H01J25/04; (IPC1-7): H01J25/00; H01J23/14; H01J23/36; H01J23/46
Attorney, Agent or Firm:
Sumio Takeuchi (1 outside)