Coaxial magnetron slot mode suppressor

Claim 2

A crossed field device comprising: a resonant system including a plurality of spaced anode members supported by a boundary wall defining therebetween a plurality of cavity resonators and a cathode member to generate high frequency oscillations in the pi-mode; means including said boundary wall defining a coaxial cavity adapted to be resonant in a predetermined electric and magnetic field mode; said boundary wall having a plurality of axially extending slots coupling high frequency energy in said anode-cathode cavity resonators to said coaxial cavity; means comprising a slot mode absorber assembly including a member of a lossy material movably disposed adjacent to the ends of said coupling slots to suppress energy stored therein capable of generating oscillations in modes other than said resonant mode; and means for axially translating said assembly over a predetermined tuning range to expose a varying quantity of said lossy material to the energy within said slots.

Claim 3

The device according to claim 1 wherein said lossy material member comprises a carbonized ceramic member.

Claim 4

The device according to claim 1 wherein said coaxial cavity is external to the anode-cathode resonant system.

Claim 5

The device according to claim 1 wherein said coaxial cavity is internal within said anode-cathode resonant system.

Claim 6

A crossed field device comprising: a resonant system including a plurality of spaced anode vane members supported by a cylindrical boundary wall defining therebetween a plurality of cavity resonators and a cathode member to generate high frequency oscillations in the pi-mode; means including said boundary wall defining a coaxial cavity adapted to be resonant in a predetermined electric and magnetic field mode over a frequency band; said boundary wall having a plurality of axially extending slots coupling high frequency energy in said anode-cathode cavity resonators to said coaxial cavity; means including an axially translated tuning member disposed within said coaxial cavity to vary the resonant frequency; means comprising a slot mode absorber assembly including a ring-shaped member of a lossy material movably disposed adjacent to the ends of said coupling slots; and means for moving said lossy material in consort with said cavity tuning means over a portion of said band to expose a varying quantity of said lossy material to energy stored within said slots.

Claim 7

A crossed field device comprising: a resonant system including a plurality of spaced anode vane members supported by a cylindrical boundary wall defining therebetween a plurality of cavity resonators and a cathode member to generate high frequency oscillations in the pi-mode; means including said boundary wall defining a coaxial cavity adapted to be resonant in a predetermined electric and magnetic field mode over a frequency band; said boundary wall having a plurality of axially extending slots coupling high frequency energy in said anode-cathode cavity resonators to said coaxial cavity; means including an axially translated tuning member disposed within said coaxial cavity to vary the resonant frequency; means comprising a slot mode absorber assembly including a ring-shaped member of a lossy material movably disposed adjacent to the ends of said coupling slots; and means for moving said lossy material in consort with said cavity tuning means over a portion of said band to expose a varying quantity of said lossy material to energy stored within said slots.

Claim 8

The device according to claim 5 wherein said slot mode absorber assembly is carried over the portion of the band approaching the upper limit.

Claim 9

A coaxial magnetron comprising: an anode member having a plurality of spaced vane members supported by a boundary wall and defining therebetween cavity resonators; a cathode member; means including said boundary wall defining a resonant cavity disposed coaxially to said anode member; means for producing transverse electric and magnetic fields; said boundary wall having a plurality of axially extending slots coupling said cavity resonators and coaxial cavity; a tunable slot mode absorber assembly having a member of a lossy material movAbly disposed adjacent to the ends of said slots; and means for translating said assembly axially to vary the amount of said material exposed within said slots over a predetermined frequency range.

Claim 10

A coaxial magnetron comprising: an anode member having a plurality of spaced vane members supported by a boundary wall and defining therebetween cavity resonators; a cathode member; means including said boundary wall defining a resonant cavity disposed coaxially to said anode member; means for producing transverse electric and magnetic fields; said boundary wall having a plurality of axially extending slots coupling said cavity resonators and coaxial cavity; a tunable slot mode absorber assembly having a member of a lossy material movAbly disposed adjacent to the ends of said slots; and means for translating said assembly axially to vary the amount of said material exposed within said slots over a predetermined frequency range.

Claim 11

a coaxial magnetron according to claim 7 wherein said slot mode absorber assembly is axially translated by a tuner mechanism including spaced pin guiding members.

Claim 12

A coaxial magnetron according to claim 7 wherein said lossy material member is maintained under tension by a spring member adapted to return same to a rest position after a tuning excursion.

Claim 13

A coaxial magnetron comprising: a cylindrical anode member having a plurality of spaced vane members extending radially from a boundary wall and defining therebetween cavity resonators; a cathode member; means including said boundary wall defining a resonant cavity disposed coaxially to said anode member; means for tuning the frequency of said coaxial cavity; means for producing transverse electric and magnetic fields; said magnetic field producing means including inner pole piece members disposed on opposing sides of said cavity resonators for directing the magnetic field parallel to the axis of said cathode member; said boundary wall having a plurality of axially extending slots coupling said cavity resonators to said coaxial cavity; a tunable slot mode absorber assembly having a member of a lossy material movably disposed adjacent to the ends of said slots; and means supported by one of said pole piece members for translating said assembly in consort with said coaxial cavity tuning means over a portion of said tuning range to expose a varying amount of said material within said slots and absorb energy stored therein.

Claim 14

A coaxial magnetron comprising: a cylindrical anode member having a plurality of spaced vane members extending radially from a boundary wall and defining therebetween cavity resonators; a cathode member; means including said boundary wall defining a resonant cavity disposed coaxially to said anode member; means for tuning the frequency of said coaxial cavity; means for producing transverse electric and magnetic fields; said magnetic field producing means including inner pole piece members disposed on opposing sides of said cavity resonators for directing the magnetic field parallel to the axis of said cathode member; said boundary wall having a plurality of axially extending slots coupling said cavity resonators to said coaxial cavity; a tunable slot mode absorber assembly having a member of a lossy material movably disposed adjacent to the ends of said slots; and means supported by one of said pole piece members for translating said assembly in consort with said coaxial cavity tuning means over a portion of said tuning range to expose a varying amount of said material within said slots and absorb energy stored therein.

Claim 15

A coaxial magnetron according to claim 10 wherein said absorber assembly is picked up and carried over a predetermined portion of the tuning excursion of said coaxial cavity tuning means.

Claim 16

A coaxial magnetron according to claim 10 wherein said coaxial cavity includes end walls with lossy mode absorbing material disposed therein.

Claim 17

A coaxial magnetron according to claim 10 wherein said lossy material member is urged upwardly in the rest position by a spring member of a refractory metal.