MW Systems

Attenuation system

ATTENUATION STAGES (IN CONTINUOUS FLOW SYSTEMS)

Attenuation stages are installed at the entrance and exit of the processing cavity, which are composed of the first system for the impedance mismatching (metallic cavities with particular geometries on the walls) followed by absorbing loads (hydraulic circuit, radio absorbing panels, etc.) where the possible residual energy can be dissipated. Standard length is 1m and it is possible to customize particular plants.

DOORS (BATCH SYSTEMS)

All the doors are provided with special metallic profile (reactive choke) impeding the microwave propagation outside. Moreover, possible inspection openings (windows, portholes, ...) are protected with particular metallic grids.

Application chain

POWER SUPPLY

Digital devices (or analogical on demand) with adjustable power for feeding and piloting of magnetron (2450MHz, CW) of 1-1.5-2-6kW with continuous wave functioning. EC certified product, available in EU or USA version.

• Feed Voltage: 110/208/230/380-400/480/575 Vac
• Network/system frequency: 50, 60 Hz
• Power radiated from magnetron: 0.8 / 1 /1.5 / 1.9 / 2.5 / 3 / 6 kW
• Set up of radiated power: step (500W) or continuous with switching system (10-100%)
• Microprocessor for the control of operating functions and conditions
• Protection system against network disturbances
• Independent system of cooling (fan 230Vac, 35W, 300m3/h)
• Power wires HV-protected

MAGNETRON

Generators of continuous-wave high-power microwaves. Through a thin wire (anode) supplied with high voltage (4000V) and a specific antenna, a coherent microwave radiation with constant frequency (2450±50MHz) is generated and emitted.

• Radiation power: 0.8 / 1 / 1.5 / 1.9 / 2.5 / 3/ 6kW
• Air cooling (fan 90-300m3/h) or water cooling (circuit flow rate 4 l/min)
• Producers: Panasonic, National ELECTRONICS, Toshiba, Hitachi

MAGNETRON HEAD

Installation and maintenance friendly compact solution, available for various magnetron models of 2450MHz, includes magnetron, launcher and air cooling system.

• Radiation power: 0.8 / 1 / 1.5 / 1.9 / 2.5 / 3/ 6kW (power from 1, 1.5, 2 and 6kW)
• Adaptation flange for waveguide (WR340, WR430, WR284 or on request for other sections)
• Pilot light to signal the beginning of the radiation
• Prearrangement for the interfacing to the special power kit via 6-pole connecter

LAUNCHER

Profiles produced from high-conductive material (aluminum, stainless steel, brass) with special seat for magnetron antenna (2450MHz, 1-1.5-2-6kW). They are suitably designed and dimensioned so as to allow a maximum efficiency of the microwave transmission.

• Fixed section linked to the frequency of the radiation itself (adapted to the waveguides WR340 86*43mm)
• Available lengths: 120, 300mm
• Possible customizing and adapting to other waveguides on request

TUNER

Components for guides WR430 enable matching load impedance to the generator and thus minimize the reflected power. There are available 3 or 4-stub tuners provided with manual or motored regulation. Tuner is also available in automatic version, in which motored stubs are controlled by a microprocessor for the automatic adjustment to the load.

• Maximal power 6kW
• Frequency 2450MHz, VSWR 3:1

ISOLATOR

Passive protection component of magnetrons, recommended for a very high-power applications. It allows dissipating possible reflected power (not absorbed by the processed product) on the hydraulic circuit, avoiding over-heating and damaging of the magnetron itself.

• BNC output for monitoring of the reflection signal
• Available with output connecter in line or transversal (90º)

WAVEGUIDE

Profiles of high-conductive material (aluminum, stainless steel, brass) designed and dimensioned in a way so that the transmission from the generation point to the application point of the microwaves takes place according to a coherent configuration and with minimal energy losses. The dimensions and the geometry of the waveguides are closely connected to the frequency of the radiation which is propagated in inside the device.

• Available in the version WR340 (frequency range 2.2-3.3 GHz) with or without flange
• Length made to measure

CAVITIES

Various configurations of applicators make object of studies, considering the material and the process that the product has to undergo inside the applicator. Subsequently, two fundamental categories of applicators are to be observed:

• SINGLE MODE CAVITIES
  Metallic cavities characterized by high-density of energy and energy transfer with defined frequency and electromagnetic field configuration, are adapted for reduced-size products since at least two of the applicator dimensions are of the order of the size of the wave length. Maximal applicable power is of 6kW.
• MULTIMODE CAVITIES
  Metallic cavities of variable dimensions (internal volumes ≥1m3) for batch or in line processes, with any kind of transport (rolling strip, belts, conveyor belts, …) which requires a high power. It is possible to combine multiple heating technologies (hot air, IR, UV) in order to optimize any type of process.

RADIATOR APPLICATORS

Systems of launching microwaves inside the cavity applicators:

• SLOTTED WAVEGUIDES
  Designed to maximize the energy transfer and to optimize the uniformity of the product processing. It is also useful as it allows installation of multiple magnetron with the aim to avoid interferences and disturbances between different sources.
  Available in various models and lengths with possibility of customization: 3500mm-30slots; 1600mm-18slots, 1300mm-14slots; 1000mm-12slots; 600mm-6slots
• HORN ANTENNAS
  Sections and lengths on demand

SENSORS and PROBES

SIMPLE SENSORS

Sensors for survey of the electromagnetic field in the microwave cavity.

• Broadband (3MHz-3GHz) isotropic antenna (capacitive type) and BNC output
• Power supply 24VDC
• Output 0-10VDC
• Electric field sensitivity 10-150V/m
• Possible to regulate the survey sensitivity and customize the circuit according to the type of the cavity to be monitored

DATA LOGGER

Sensors for measuring the radiated electromagnetic field and the thermal effects on the processed material inside the microwave cavity.

• Broadband (3MHz-3GHz) isotropic antenna, field sensitivity 10-500V/m, resolution 3V/m
• Temperature probe with 0.1ºC precision, maximal temperature 150ºC.
• Selectable sampling frequency (0.001 ÷ 10Hz)
• USB cable for connection to PC
• Easy and instant software for downloading, managing and programming of the data acquisition
• Rechargeable batteries
• Hardware and software customization on demand

SENSORS OF MICROWAVE EMISSIONS

Sensors of RF electromagnetic field for the protection and security of the equipment. Can be installed close to the RF-microwaves sources.

• Signaling LED (alarm and normal functioning)
• Set up of the emission limit (threshold for power shutdown)
• Digital entry for control of the functioning
• Integrated antenna for the field survey
• Power supply 24VDC
• Output (contact relay) 0-15VDC
• Maximal commutable load 2-60W
• Plastic box

COMPLEMENTS

• TRANSITIONS
  For waveguides and launchers (WR340) on E-H plants (curved or square, various angulations)
• FLANGES
  For waveguides, isolators and launchers (WR340) with through holes, clearance holes
• CABLES AND CONNECTERS
  For high voltage, with or without shielding, diameters from 4 mm2
• CALIBRATION PLUGS
  With rods and shielding profiles for the regulation of the waveguides length and mono-modal applicators (WR340)
• SPECIAL SUPPORTS AND PROFILES
  In plastic material, transparent to the microwaves, according to the clients needs (PTFE, PVC, polyzene)
• GASKET SEAL RINGS
  In aluminum for magnetron antennas
• STIRRERS
  Motored device to be inserted inside the multimode cavities in order to optimize the uniformity of the heating process
• COOLING FANS
  Cooling fans for forced convection for cooling the magnetron, available in various models and flow-rates (230Vac, 50Hz, flow range 90/300m3/h)