What we offer

AC Metaxas & Associates have experience in the use of RF and microwave energy into the industrial sector.

Such experience was gained first at the Electricity Council Research Centre now CTech Innovation in Chester, UK and latterly at the EUG, a research group established by Dr Metaxas at the Engineering Department at the University of Cambridge.

The article highlighted here describes the basic principles or microwave heating (see MicrowaveHeating). A similar article, however describing both RF and microwaves use in industry can be found in ARTICLE 2010.

(a) Microwave

Photo on the right  shows a  25 kW 896 MHz glass domed prototype magnetron designed by Magnetronics Ltd in the late 1970’s, now upgraded to deliver up to  90 kW with a ceramic dome

Examples of processes that can benefit by the incorporation of microwave energy

  • Tempering of frozen foodstuffs (meat, fish and vegetables)
  • Rubber vulcanisation
  • Drying under vacuum (pharmaceutical and/or drugs)
  • Processing of foodstuffs
  • Plasma processing
  • Processing of wastes
  • Heating of foundry moulds and cores
  • Processing of minerals
  • Processing of ceramics
  • Bread Psteurisation
  • Multifarious drying applications (pasta, cores, inks)
  • Puffing of snack foods
  • Sterilisation of fluid foodstuffs followed by aseptic canning
  • Processing of chemicals                                                                                            

Waveguide ranges, from ltr on the adjoining photo:

W4 896(UK)-915 MHz Word wide

W9A 2450 MHz

W10 2450 MHz


(b) Radio Frequencies 

Examples of processes that can benefit by the incorporation of Radio frequency energy

  • Plastics welding
  • Drying of textiles (loose wool, fabric, threads etc)
  • Processing of foodstuffs such as end drying of biscuits and cereals
  • End drying of biscuits
  • Paper converting (drying of glue in envelopes etc)
  • Drying of inks
  • Drying of fibre glass
  • Processing of wood and laminates
  • Moisture levelling of paper and board
  • Processing structures layers and interlayers such as in coloured or metalized glass, acrylic, ceramics and polycarbonate

Typical 1 kW triode valve for RF heating shown on the extreme right

(c) Examples of some projects undertaken by the group are listed below:

Design of heating cavities or applicators for RF and microwave heating in the frequency regime 10 MHz to 35 GHz, for heating, curing or drying of many other dielectric materials.

Advice on retrofitting or upgrading existing industrial drying or heating equipment

In depth review of current pilot scale projects, funded by multinationals, and  intended for commercialisation

Advice on setting up test facilities and laboratory scale experiments

Feasibility and case studies on specific proposals with costs

Bespoke training courses for academics, industry and commerce presented in Cambridge or at a specific firm’s premises

Expert witness representation and advice on various aspects of RF and microwave heating

Advice on setting up an examinable course linked to a specific degree

Theoretical studies for RF and Microwave systems

Literature surveys and producing reports on any topic linked with the use of RF or microwave energy use in industry