A quarter wave coaxial cavity resonator for producing corona discharge plasma from is presented. The quarter wave coaxial cavity resonator has a folded cavity made of opposing concentric cavity members that are nested together to form a continuous cavity ending in a aperture. A center conductor with
A quarter wave coaxial cavity resonator for producing corona discharge plasma from is presented. The quarter wave coaxial cavity resonator has a folded cavity made of opposing concentric cavity members that are nested together to form a continuous cavity ending in a aperture. A center conductor with a tip is positioned in the cavity. The folded cavity advantageously permits the coaxial cavity resonator to resonate at a lower operating frequency than an unfolded quarter wave coaxial cavity resonator of the same length. Embodiments of the quarter wave coaxial cavity resonator use narrower apertures to reduce radiative losses, and include center conductors that are reactive load elements, such as helical coils. When a radio frequency (RF) oscillation is produced in the quarter wave coaxial cavity resonator, corona discharge plasma is formed at the tip of the center conductor. The corona discharge plasma can be used to ignite combustible materials in combustion chambers of combustion engines.
대표청구항▼
1. A quarter wave coaxial cavity resonator, comprising: a folded cavity formed from a plurality of opposing concentric nested cavity members, one of said cavity members being an open cavity member having an aperture; anda center conductor having a tip, at least a portion of said center conductor dis
1. A quarter wave coaxial cavity resonator, comprising: a folded cavity formed from a plurality of opposing concentric nested cavity members, one of said cavity members being an open cavity member having an aperture; anda center conductor having a tip, at least a portion of said center conductor disposed in said folded cavity;wherein an RF corona is formed at said tip of said center conductor when a sustained RF oscillation is produced in the quarter wave coaxial cavity resonator. 2. The quarter wave coaxial cavity resonator of claim 1, further comprising a threaded body surrounding said aperture that is adapted to fit a spark plug socket. 3. The quarter wave coaxial cavity resonator of claim 1, wherein the folded cavity has a transition region between a pair of adjacent cavity members having differing radii, and further comprising a dielectric seal positioned in the transition region to reduce an impedance discontinuity at the transition region. 4. The quarter wave coaxial cavity resonator of claim 1, wherein said tip has a pointed geometry. 5. The quarter wave coaxial cavity resonator of claim 1, wherein said center conductor comprises a helical reactive load element. 6. The quarter wave coaxial cavity resonator of claim 1, wherein the open cavity member has tapered outer end defining the aperture as an open annular space surrounding the tip of the center conductor. 7. A quarter wave coaxial cavity resonator, comprising: a folded cavity formed from a plurality of opposing concentric nested cavity members, one of said cavity members being an open cavity member having an aperture;a center conductor having a tip, at least a portion of said center conductor disposed in said folded cavity, wherein an RF corona is formed at said tip of said center conductor when a sustained RF oscillation is produced in the quarter wave coaxial cavity resonator; anda loop coupling to couple an energy shaping means to said center conductor of the quarter wave coaxial cavity resonator. 8. A quarter wave coaxial cavity resonator, comprising: a folded cavity formed from a plurality of opposing concentric nested cavity members, one of said cavity members being an open cavity member having an aperture;a center conductor having a tip, at least a portion of said center conductor disposed in said folded cavity, wherein an RF corona is formed at said tip of said center conductor when a sustained RF oscillation is produced in the quarter wave coaxial cavity resonator; andan energy shaping means operably coupled to said center conductor that produces an RF oscillation in said quarter wave coaxial cavity resonator such that said RF corona is formed in the region of said tip of said center conductor. 9. The quarter wave coaxial cavity resonator of claim 8, wherein said energy shaping means generates said RF oscillation and uses the quarter wave coaxial cavity resonator as a frequency determining element in generating said RF oscillation, and wherein said energy shaping means is selected from the group consisting of a negative resistance device, a negative resistance device incorporated into the quarter wave coaxial cavity resonator, an RF field effect transistor, spark gap, a pulse amplifying device, an electron tube, an electron drift tube, a traveling wave tube, an amplitron, and a magnetron, and wherein a feedback means operably associated with the quarter wave coaxial cavity resonator provides feedback to said energy shaping means, said feedback means is selected from the group consisting of a probe, a pickup loop, and a waveguide. 10. A quarter wave coaxial cavity resonator, comprising: concentric cavity members including an open cavity member with an aperture, the cavity members together forming a cavity having adjacent length portions with differing radii that cause impedance discontinuities, and having transition regions between the adjacent length portions;a center conductor positioned in the open cavity member and having a tip for forming an RF corona at the aperture when a sustained RF oscillation is produced in the quarter wave coaxial cavity resonator; anda plurality of dielectric seals spaced apart along the length of the cavity, with each of the plurality of seals positioned in a respective transition region of the cavity to reduce an impedance discontinuity at the respective transition region. 11. The quarter wave coaxial cavity resonator of claim 10, wherein each of the plurality of seals is a washer shaped part with a uniform thickness and a uniform outer diameter greater than the uniform thickness. 12. The quarter wave coaxial cavity resonator of claim 10, wherein the open cavity member has a free end at a transition region of the cavity, and the plurality of seals include a seal that is positioned on the center conductor and adjoins the free end of the open cavity member. 13. The quarter wave coaxial cavity resonator of claim 10, wherein the cavity members include an outer cavity member surrounding the open cavity member, and the plurality of seals include a seal that is positioned on the center conductor and reaches radially from the center conductor to the outer cavity member. 14. The quarter wave coaxial cavity resonator of claim 10, wherein each of the plurality of seals has a dielectric constant selected with reference to the differing radii of the length portions of the cavity adjacent to the respective transition region. 15. The quarter wave coaxial cavity resonator of claim 10 wherein the cavity members are nested to form the cavity as a folded cavity in which the adjacent length portions reach in opposite directions.
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