Abstract: An electrodeless plasma lamp includes a bulb containing a gas-fill and light emitter(s) excited to produce light using radio-frequency (RF) energy. Input and output coupling elements separated from each other by a gap couple RF energy from an RF source to the bulb. One end of the input coupling element is electrically connected to an RF source while the other end is connected to ground. One end of the output coupling element is connected to ground while the other end is connected to the bulb.

Abstract: An electrode-less plasma lamps comprises generally of a bulb containing a gas-fill that is excited to produce light using radio-frequency (RF) energy. In specific embodiments, the use of grounded coupling-elements with integrated bulb assemblies simplifies manufacturability, improves resonant frequency control, and enables the use of solid, partially filled, and hollow lamp bodies. In some embodiments, a method of operating an electrodeless plasma lamp device includes transferring RF energy from the RF source to an input coupling-element and illuminating electromagnetic energy substantially from the length of a gas-filled vessel from discharge of the gas-filled vessel.

Abstract: A street lamp apparatus. The apparatus has a housing having an inner region and an outer region. In a specific embodiment, the inner region forms a cavity structure. The apparatus also has a transparent cover coupled to the housing to enclose the inner region and a socket being provided within the cavity structure. The apparatus has an electrodeless plasma lamp coupled to the socket. In a specific embodiment, the apparatus has an RF power source provided between the socket and an AC power source. In a specific embodiment, the RF power source is configured to generate a frequency of about 1 GHz and less to cause a fill material in the plasma lamp to discharge. In a specific embodiment, the apparatus has a heat sink provided form one or more portions of the housing. In a specific embodiment, the one or more portions of the housing is thermally coupled to the RF power source.

Abstract: In various embodiments, an electrodeless high intensity discharge lamp is provided, which may include a bulb containing a fill mixture for generating a light emission when excited by microwave energy; and at least two applicator arms for coupling the microwave energy to the fill mixture, the at least two applicator arms being separated by at least one delay line, the at least one delay line comprising a stripline structure.

Abstract: An electrodeless plasma lamp having a bulb containing a fill that forms a light-emitting plasma is described. The lamp includes a power amplifier to provide radio frequency power to the fill at a frequency in the range of about 50 MHz to 10 GHz and the power amplifier is configured to operate in at least two classes of operation. Control electronics of the lamp is configured to change the class of operation of the power amplifier during operation of the plasma lamp. For example, the power amplifier may be configured to operate as a class A/B amplifier during at least a first mode of operation and a class C amplifier during at least a second mode of operation.

Abstract: A lamp with a quartz electrodeless bulb has a ceramic wave guide with a central void, in which the bulb is accommodated. The wave guide is rectangular. The central void is centered on a central longitudinal plane of the wave guide, normal to front and back faces of the wave guide and equally spaced from end faces. Parallel with the central void and also on the central plane are two further voids for respective antennae. The central void is open through the front face for egress of light, but the antenna voids are not open in this face. The latter is metalized to inhibit egress of microwave energy from the wave guide.

Abstract: A plasma lighting system is disclosed. Interference with an electronic device using the same band as that of the plasma lighting system can be avoided by changing the shape of vanes constituting a magnetron, and a filament current of the magnetron at an initial starting stage and that in a normal state are adjusted to be different, thus avoiding interference with a wireless LAN and attenuating noise, and a resonator has a mash form to increase efficiency. Because a rectangular waveguide is bent substantially at a right angle, and the magnetron and the resonator are disposed at one side on the basis of a waveguide space of the waveguide, thus reducing the size and an installation space of the plasma lighting system.

Abstract: A dielectric waveguide integrated plasma lamp (DWIPL) with a body comprising at least one dielectric material having a dielectric constant greater than approximately 2, and having a shape and dimensions such that the body resonates in at least one resonant mode when microwave energy of an appropriate frequency is coupled into the body. A dielectric bulb within a lamp chamber in the body contains a fill which when receiving energy from the resonating body forms a light-emitting plasma. The bulb is transparent to visible light and infrared radiation emitted by the plasma. Radiative energy lost from the plasma is recycled by reflecting the radiation from thin-film, multi-layer coatings on bulb exterior surfaces and/or lamp chamber surfaces back into the bulb.

Abstract: An electrodeless, microwave lamp has a magnetron as a microwave source and an excitable material lucent crucible in whose excitable material a plasma is established. For coupling microwaves from the magnetron into the crucible, an air wave guide coupling circuit is provided, with an output of the magnetron as an input at one quarter lambda from one end and an output at one quarter from the other end as an input to a connection to the crucible.

Abstract: A plasma electrodeless lamp comprises a substantially hollow metallic body, closely receiving two coupling elements, the first coupling element connected to the output of an RF amplifier, and the second coupling element connected to the input of an RF amplifier. The first coupling element is conductively connected (grounded) to metallic lamp body at its top surface, while the second coupling element is not. The lamp further comprises a vertical metallic post, the post being grounded to the metallic lamp body at the post's bottom surface. The lamp further comprises a dielectric sleeve which closely receives the metallic post, and which is in turn closely supported by the lamp body or alternatively or in combination a tuning stub. The lamp further comprises a bulb that is closely received by the metallic post, and that encloses a gas-fill which forms a radiant plasma when excited.

Abstract: Disclosed herein is a class of mm and sub mm wavelength amplifiers and oscillators operating with miniature helical slow wave circuits manufactured using micro fabrication technology. The helices are supported by diamond dielectric support rods. Diamond is the best possible thermal conductor, and it can be bonded to the helix. The electron beam is transmitted, not through the center of the helix, but around the outside. In some configurations the RF power produced may be radiated directly from the slow wave circuit. The method of fabrication, which is applicable above 60 GHz, is compatible with mass production.

Abstract: A microwave-excited ultraviolet lamp system includes a microwave chamber cooled with air drawn through the chamber by a negative pressure source. A filter provided at an inlet of the lamp system prevents particulate material from entering the microwave chamber.

Abstract: An electrodeless plasma lamp is described comprising a lamp body including a solid dielectric material. The lamp includes a bulb received at least partially within an opening in the solid dielectric material and a radio frequency (RF) feed configured to provide power to the solid dielectric material. A conductive material is provided adjacent to the bulb to concentrate the power proximate the bulb. The conductive material may be located below an upper surface of the solid dielectric material. The conductive material may modify at least a portion of an electric field proximate the bulb so that the portion of the electric field is oriented substantially parallel to an upper surface of the lamp body.

Abstract: A bandpass filter comprises an air filled aluminum chamber having a lid and a cuboid resonant cavity having a central iris. At opposite end nodes of the cavity, perfect electric conductors (PECs) are provided. Threaded tuning projections opposite the PECs and in the iris are provided, whereby the pass band and the transmission characteristics of the filter in the pass band can be tuned to match the input impedance of the band pass filter and the wave guide to the output impedance of a microwave drive circuit. It is mounted on one end of the filter chamber, with an electrodeless bulb in a central cavity directed axially away from the chamber and the radiator in a further cavity set to one side of the central cavity. When the filter is driven, the wave guide resonates driving the bulb.

Abstract: To prevent the continuation of the abnormal state occurring immediately after the lighting start of the electrodeless discharge lamp excited by a DC driven magnetron and to recover promptly from the abnormal state at the steady state period. Lighting start of an electrodeless discharge lamp is performed in soft start mode. Increasing the power supply to the magnetron gradually, the lamp is turned into a lighting state for longer time than the time for the luminescence medium to evaporate fully absorbing microwave. At that period, the output of DC power supply is periodically cut off momentarily, resetting the abnormal state. Then, stable DC power is supplied. At the steady state period, the anode current of the magnetron is controlled to be constant. When rise of the operation voltage of the magnetron is detected, the output of DC power supply is cut off momentary to recover to the steady state.

Abstract: A plasma lamp is described with resonant frequency tuning capability and associated methods for tuning. One tuning method allows plasma lamp manufacturer to set the frequency of lamps to several discrete predetermined values. For example, most lamps that are near the center of a frequency distribution can be tuned to a nominal value such as 918.7 MHz. Other frequencies can also be tuned to increase manufacturing yield and improve lamp performance.

Abstract: An electrodeless plasma lamp and method of generating light are described. The lamp may comprise a lamp body, a source of radio frequency (RF) power and a bulb. The lamp body may comprise a solid dielectric material and at least one conductive element within the solid dielectric material. The source of RF power is configured to provide RF power and an RF feed configured to radiate the RF power from the RF source into the lamp body. The bulb is positioned proximate the lamp body and contains a fill that forms a plasma when the RF power is coupled to the fill from the lamp body. The at least one conductive element is configured to concentrate an electric field proximate the bulb.

Abstract: A plasma lamp including a waveguide body comprising at least one dielectric material. The body is coupled to a microwave power source which causes the body to resonate in at least one resonant mode. A lamp chamber integrated with the body contains a bulb with a fill forming a light-emitting plasma when the chamber receives power from the resonating body. A bulb either is self-enclosed or an envelope sealed by a window or lens covering the chamber aperture. Embodiments disclosed include lamps having a drive probe and a feedback probe, and lamps having a drive probe, feedback probe and start probe, which minimize power reflected from the body back to the source.

Abstract: A low-temperature, atmospheric-pressure microplasma generator comprises at least one strip of metal on a dielectric substrate. A first end of the strip is connected to a ground plane and the second end of the strip is adjacent to a grounded electrode, with a gap being defined between the second end of the strip and the grounded electrode. High frequency power is supplied to the strip. The frequency is selected so that the length of the strip is an odd integer multiple of ¼ of the wavelength traveling on the strip. A microplasma forms in the gap between the second end of the strip and the grounded electrode due to electric fields in that region. A microplasma generator array comprises a plurality of strongly-coupled resonant strips in close proximity to one another. At least one of the strips has an input for high-frequency electrical power. The remaining strips resonate due to coupling from the at least one powered strip. The array can provide a continuous line or ring of plasma.

Abstract: A dielectric waveguide integrated plasma lamp is disclosed for powering a small and bright bulb with a diameter of a few millimeters. The lamp is contained within a high dielectric constant material which guides the microwaves to the bulb, provides heat isolation to the drive circuit, contains the microwaves, provides structural stability and ease of manufacturing and allows efficient energy coupling to the bulb when used as a dielectric resonant oscillator.

Abstract: An RF screen for microwave powered UV lamp systems is provided. The RF screen is formed of a single sheet of conductive material in which a mesh pattern has been formed. The screen includes a non-traditional mesh pattern including individual openings with 3 or more nodes. The RF screen is generally configured to optimize the balance between light transmission and RF energy leakage desired for the particular application. Generally, it is desired that the RF screen has an open area percentage greater than about 80% while limiting RF energy leakage from the microwave powered lamp system to acceptable levels.

Abstract: A dielectric-loaded field applicator and an EHID lamp assembly are provided wherein the applicator comprises a helical resonator having a cylindrical dielectric core and a helical conductor, the dielectric core having a helical groove extending along its surface substantially from end to end; the helical conductor being contained in the helical groove and connectable at one end to a power source, the dielectric core being comprised of a dielectric material having a relative permittivity greater than about 3, preferably polycrystalline alumina. The EHID lamp assembly includes two opposed dielectric-loaded applicators with a discharge vessel supported between them.

Abstract: In one example embodiment, a drive probe is coupled to the lamp body to provide the primary power for ignition and steady state operation of the lamp. Feedback may be used to adjust frequency in response to changing conditions of the lamp during startup. A phase shifter may be used to adjust the phase of the power between ignition and steady state operation. A sensor may detect a lamp operating condition that automatically triggers a shift in phase after the fill in the bulb is vaporized. In another example embodiment, a method for sequentially optimizing the drive power and phase shift applied to the lamp is disclosed that may reliably regulate the lamp current consumption to desired startup and operational levels despite variations in lamp environmental conditions.

Abstract: A dielectric barrier discharge lamp assembly for a fluid treatment system. The lamp assembly can include an inductive secondary, first and second electrodes coupled to the inductive secondary, and a lamp including a dielectric barrier interposed between the first and second electrodes. The dielectric barrier can define a discharge chamber including a discharge gas, and one of the first and second electrodes can extend within the discharge chamber. The inductive secondary can be adapted to receive power from a nearby inductive primary to promote a dielectric barrier discharge in the discharge chamber. The resulting dielectric barrier discharge can generate ultraviolet light for the treatment of air or water, or for other applications.

Abstract: A lamp and methods of forming are shown. In one example, a dielectric layer is formed over a gap between conductors in a plasma lamp. Electric arcing is reduced or eliminated, thus allowing tighter gaps and/or higher voltages. In one example a glass frit method is used to apply the dielectric layer. A lamp is shown with a barrier layer that prevents tarnish such as tarnish from sulfur exposure. The barrier layer reduces or prevents degradation of the lamp due to conversion of a conductor material to non-conductive tarnish material.

Abstract: A housing for an elongate electrodeless bulb which is energiseable by an rf field such as a microwave field, preferably at or around 2.45 GHz. The housing is constructed of electrically conductive material and is arranged to have a substantially unobstructed opening through which the bulb is visible from outside the housing, and the housing is arranged to hold the bulb in a position which is recessed into the housing such that in use, the bulb is energized by virtue of its position within the housing and adjacent surrounding conductive parts of the housing substantially attenuate the rf field near the opening so that the rf field strength outside the housing is substantially zero whereby visible light or UV light is freely allowed out through the opening.

Abstract: A transmission circuit (101) for transmitting data onto a transmission line, and a mask circuit (102) for generating a mask signal (105) for removing a reflected wave based on a transmission timing notification signal (104) supplied form the transmission circuit (101) are provided. For example, a timer circuit (301) causes the mask signal (105) to be effective only for a predetermined time immediately after transmission. A logic circuit (302) is used to remove a reflected wave from the received signal (106) based on the mask signal (105), and a resultant masked received signal (107) is input to a reception circuit (103).

Abstract: In an example embodiment, an electrodeless plasma lamp is, provided which comprises a dielectric body having an effective dielectric constant greater than two. The dielectric body may have a surface with a first region coated with an electrically conductive material and a second region that is not coated with the electrically conductive material. A bulb is located proximate to the second region of the dielectric body and having an outer surface area and the second region may have an uncoated surface area that is less than about sixty percent (60%) of the outer surface area of the bulb. A power source is coupled to the dielectric body to provide radio frequency power to the dielectric body at a frequency that resonates at a fundamental mode in the dielectric body. The bulb contains a fill that forms a plasma when the radio frequency power is provided from the dielectric body through the second region.

Abstract: A dielectric waveguide integrated plasma lamp (DWIPL) with a body comprising at least one dielectric material having a dielectric constant greater than approximately 2, and having a shape and dimensions such that the body resonates in at least one resonant mode when microwave energy of an appropriate frequency is coupled into the body. A dielectric bulb within a lamp chamber in the body contains a fill which when receiving energy from the resonating body forms a light-emitting plasma. The bulb is transparent to visible light and infrared radiation emitted by the plasma. Radiative energy lost from the plasma is recycled by reflecting the radiation from thin-film, multi-layer coatings on bulb exterior surfaces and/or lamp chamber surfaces back into the bulb.

Abstract: In an example embodiment, an electrodeless plasma lamp is provided which comprises a lamp body comprising a dielectric material having a relative permittivity greater than 2, and a bulb adjacent to the lamp body, the bulb containing a fill that forms a plasma when RF power is coupled to the fill from the lamp body. An RF feed is coupled to the lamp body and a radio frequency (RF) power source for coupling power into the lamp body through the RF feed is provided. A shortest distance between an end of the bulb and a point on the RF feed traverses at least one electrically conductive material of the lamp body.

Abstract: A dielectric waveguide integrated plasma lamp is disclosed for powering a small and bright bulb with a diameter of a few millimeters. The lamp is contained within a high dielectric constant material which guides the microwaves to the bulb, provides heat isolation to the drive circuit, contains the microwaves, provides structural stability and ease of manufacturing and allows efficient energy coupling to the bulb when used as a dielectric resonant oscillator.

Abstract: The present invention provides a relativistic magnetron with axial extraction, or magnetron with diffraction output (MDO), with a mode converter placed directly within the diffraction output of radiation to effectively convert the operating ?-mode into a radiated mode of simpler radiation patterns.

Abstract: A crossed field device, such as a magnetron or crossed field amplifier, that includes a cathode, an anode, one or more magnetic elements, and one or more extraction elements. In one embodiment, the crossed field device includes an annular cathode and anode that are axially spaced from one another such that the device produces an axial electric (E) field and a radial magnetic (B) field. In another embodiment, the crossed field device includes an oval-shaped cathode and anode that are radially spaced from one another such that the device produces a radial electric (E) field and an axial magnetic (B) field. The crossed field device may produce electromagnetic (EM) emissions having a frequency ranging from megahertz (MHz) to terahertz (THz), and may be used in one of a number of different applications.

Abstract: A plasma lamp apparatus that includes an improved bulb support assembly to increase the lumens per watt output of the apparatus. The bulb support assembly includes a support structure that forms a cavity for receiving the bulb. The bulb is supported within the cavity though a protrusion that extends out from the support structure in a curved manner. By created a curved protrusion, the electric field within the resonating structure of the lamp apparatus is lowered. Lowering the electric field leads to lower resonating frequencies of the resonating structure. In lowering the resonating frequency, the resonating structure is driven to resonate at lower power levels, thereby increasing the lumens per watt output of the lamp apparatus.

Abstract: An RF electrodeless plasma lamp with improved efficiency in higher lumens per watt includes a waveguide body, in which an RF signal drives the entire structure at the resonant frequency of the structure. The resonant frequency of the structure is lowered by increasing the overall capacitance of the waveguide body by adding at least two layers of dielectric material between the input feed and the bulb of the lamp. The layered structure can include an air cavity disposed between a dielectric layer and the input feed. In lowering the resonant frequency of the lamp, the device is capable of using RF amplifiers that have higher efficiency, and thus has a higher lumens per watt ratio.

Abstract: An electrodeless plasma lamp apparatus includes a waveguide body having at least a first material and a second material. At least one of the materials has a dielectric constant of less than two. In a specific embodiment, the apparatus also includes an RF power source coupled to the waveguide body to provide RF power to the waveguide body at least one frequency that resonates within the waveguide body. A bulb containing a fill which forms a plasma to cause emission of light when the RF power is provided to the waveguide body.

Abstract: A plasma lamp includes a waveguide body which has at least one solid dielectric material. The body has a diameter and a length transverse to the diameter, with the diameter of the body being less than the length of the body. The lamp also has a power source configured to provide power to the body at a resonant frequency. The waveguide body has an effective length of at least portions of the diameter and the length.

Abstract: A plasma lamp for an electrodeless plasma lamp having a dielectric waveguide body and a bulb positioned, at least in part, in the waveguide body and having at least one end protruding from the waveguide body. A probe is used to couple power into the waveguide body. The power resonates in the waveguide body and ignites a plasma in the bulb. By having one or both ends of the bulb extend beyond the surface of the waveguide body, the ends of the bulb are exposed to reduced electric field intensity, resulting in longer bulb lifetime due to reduced plasma impingement on the interior surfaces of the bulb.

Abstract: An electrodeless plasma lamp is described comprising a lamp body including a solid dielectric material. The lamp includes a bulb received at least partially within an opening in the solid dielectric material and a radio frequency (RF) feed configured to provide power to the solid dielectric material. A conductive material is provided adjacent to the bulb to concentrate the power proximate the bulb. The conductive material may be located below an upper surface of the solid dielectric material. The conductive material may modify at least a portion of an electric field proximate the bulb so that the portion of the electric field is oriented substantially parallel to an upper surface of the lamp body.

Abstract: Disclosed is a cooling structure for a plasma lighting system comprising a fan housing having at least two discharge ports having different flow rates for introducing external air into a case and cooling heat generating components in the case. The structure intensively cools heat generating components of high temperature such as a magnetron, thereby prolonging a life span of the components and enhancing a performance of a system.

Abstract: An optical source device includes a solid high frequency oscillating unit that outputs a high frequency signal, a waveguide that receives the high frequency signal output from the solid high frequency oscillating unit and radiates the received high frequency signal as a microwave, and a light emitting unit that emits light by the microwave radiated from the waveguide unit. A container of the waveguide unit has a space surrounded by reflective surfaces that reflect the microwave radiated from the antenna unit so as to collect the microwave. A projector includes this optical source device, an optical modulating unit that modulates a light beam emitted from the light emitting unit of the optical source device according to image information to form an optical image, and a projecting unit that projects the optical image formed by the optical modulating unit.

Abstract: A dielectric waveguide integrated plasma lamp (DWIPL) with a body comprising at least one dielectric material having a dielectric constant greater than approximately 2, and having a shape and dimensions such that the body resonates in at least one resonant mode when microwave energy of an appropriate frequency is coupled into the body. A dielectric bulb within a lamp chamber in the body contains a fill which when receiving energy from the resonating body forms a light-emitting plasma. The bulb is transparent to visible light and infrared radiation emitted by the plasma. Radiative energy lost from the plasma is recycled by reflecting the radiation from thin-film, multi-layer coatings on bulb exterior surfaces and/or lamp chamber surfaces back into the bulb.

Abstract: A light source device includes: a microwave generating section generating microwaves; a central conductor connected to the microwave generating section and emitting the microwaves; a discharge lamp connected to the central conductor and emitting light by the microwaves; and a reflector surrounding the discharge lamp, the reflector which has an opening at one end thereof and is formed of conductor material, wherein the relationship between a wavelength ? of the microwaves, an inside surface length D which is an inside diameter of the opening of the reflector or a maximum length of a cross-sectional shape of the opening of the reflector, and a length L from a first end of the discharge lamp opposite to a second end connected to the central conductor to the opening of the reflector is D??/2 and L/D?0.8.

Abstract: A plasma lamp and a method of generating light are provided. The plasma lamp may include a lamp body having a dielectric constant greater than about 2 and a power source. The power source is coupled to the lamp body by a feed to provide power to the lamp body. A bulb containing a fill having a first portion and a second portion is provided. The bulb is positioned so that the first portion of the fill is located within the lamp body and the second portion of the fill is located outside of the lamp body. In use, the fill receives at least a portion of the power from the lamp body to form a light-emitting plasma. The volume of the bulb is less than the volume of the lamp body.

Abstract: In an example embodiment, an electrodeless plasma lamp is provided which comprises a lamp body comprising a dielectric material having a relative permittivity greater than 2, and a bulb adjacent to the lamp body, the bulb containing a fill that forms a plasma when RF power is coupled to the fill from the lamp body. An RF feed is coupled to the lamp body and a radio frequency (RF) power source for coupling power into the lamp body through the RF feed is provided. A shortest distance between an end of the bulb and a point on the RF feed traverses at least one electrically conductive material of the lamp body.

Abstract: A luminaire reflector comprises a first end reflector segment, a second end reflector segment, and a main reflector segment bonded together as a single-piece. The main reflector segment, the first end reflector segment, and the second end reflector segment form a microwave cavity that can accommodate a microwave-powered bulb. The luminaire reflector is configured to be mated to at least one waveguide of a luminaire assembly. The luminaire reflector comprises at least one RF coupling slot to transmit microwave energy from the waveguide side to the microwave cavity side of the reflector assembly.

Abstract: A surface wave plasma (SWP) source is described. The SWP source comprises an electromagnetic (EM) wave launcher configured to couple EM energy in a desired EM wave mode to a plasma by generating a surface wave on a plasma surface of the EM wave launcher adjacent the plasma. The EM wave launcher comprises a slot antenna having a plurality of slots. The SWP source further comprises a first recess configuration formed in the plasma surface, wherein the first recess configuration is substantially aligned with a first arrangement of slots in the plurality of slots, and a second recess configuration formed in the plasma surface, wherein the second recess configuration is either partly aligned with a second arrangement of slots in the plurality of slots or not aligned with the second arrangement of slots in the plurality of slots. A power coupling system is coupled to the EM wave launcher and configured to provide the EM energy to the EM wave launcher for forming the plasma.

Abstract: A plasma lighting system comprises a resonator, a bulb received in the resonator and containing a discharge material therein for emitting light in accordance with the discharge material is exited as a plasma state, and a dielectric mirror disposed at one side of the bulb and formed of a spontaneous reflective material for spontaneously reflecting light generated from the bulb. The dielectric mirror can be included or excluded, and can smoothly reflect light without an additional reflection coating layer. The dielectric mirror is prevented from being damaged even in a high temperature, and thus a lowering of an optical efficiency is prevented when used for a long time.

Abstract: In an example embodiment, an electrodeless plasma lamp is provided which comprises a lamp body comprising a dielectric material having a relative permittivity greater than 2, and a bulb adjacent to the lamp body, the bulb containing a fill that forms a plasma when RF power is coupled to the fill from the lamp body. An RF feed is coupled to the lamp body and a radio frequency (RF) power source for coupling power into the lamp body through the RF feed is provided. A shortest distance between an end of the bulb and a point on the RF feed traverses at least one electrically conductive material of the lamp body.

Abstract: An electrodeless plasma lamp is described comprising a lamp body including a solid dielectric material. The lamp includes a bulb received at least partially within an opening in the solid dielectric material and a radio frequency (RF) feed configured to provide power to the solid dielectric material. A conductive material is provided adjacent to the bulb to concentrate the power proximate the bulb. The conductive material may be located below an upper surface of the solid dielectric material. The conductive material may modify at least a portion of an electric field proximate the bulb so that the portion of the electric field is oriented substantially parallel to an upper surface of the lamp body.