How to Choose an Industrial Microwave Generator
Choosing the right industrial microwave generator requires more than selecting a frequency and power level. The generator must match the application, process requirements, operating environment, power-delivery system, controls, cooling requirements, and integrate to other microwave system components.
Whether you are designing a new industrial microwave system or replacing an existing generator, understanding these requirements can help you select a microwave generator that provides the performance, reliability, and integration capabilities your application requires.
What Is an Industrial Microwave Generator?
An industrial microwave generator converts electrical energy into microwave energy for use in industrial heating, drying, plasma generation, material processing, and other applications.
A typical industrial microwave system consists of three primary elements:
Selecting the right generator starts with understanding how each element interacts with your process.
1. Start With the Application
The first question to ask is:
What will the microwave energy be used to accomplish?
Industrial microwave generators are used across a wide variety of processes, including:
Before selecting a generator, define the material or process being treated, desired process result, throughput, operating conditions, and whether the process will run continuously or intermittently.
2. Determine the Required Microwave Frequency
Frequency is one of the most important specifications when selecting an industrial microwave generator.
Common Industrial, Scientific and Medical (ISM) frequencies for microwave processing include 915 MHz and 2450 MHz (2.45 GHz). Other frequencies, including 896 MHz, 922 MHz, and 5.8 GHz, may also be used depending on the application and geographic requirements.
Richardson Electronics offers microwave generator solutions at standard ISM frequencies including 915 MHz and 2450 MHz.
915 MHz Microwave Generators
915 MHz systems are commonly associated with higher-power industrial microwave applications.
Richardson Electronics offers L-band generator solutions at 896 MHz, 915 MHz, and 922 MHz, with available systems reaching power levels up to 100 kW.
2450 MHz Microwave Generators
Richardson Electronics offers S-band generator solutions at 2450 MHz. 2450 MHz is widely used in industrial heating, plasma, laboratory, and processing applications.Richardson Electronics offers a range of 2450 MHz generator configurations and power levels up to 15kW for industrial applications.
Which Frequency Should You Choose?
Frequency selection should be based on several factors, including:
Not sure whether your application requires 915 MHz or 2450 MHz? Richardson Electronics' microwave engineering team can help evaluate your application requirements and configure an appropriate microwave system.
3. Calculate the Required Microwave Power
Once the operating frequency has been established, determine how much microwave power the process requires.
Industrial microwave generator power can range from relatively low-power systems to systems delivering tens or even hundreds of kilowatts.
The required power depends on factors such as:
The objective is to provide sufficient controllable microwave power across the process's required operating range.
For example, Richardson Electronics' industrial microwave generators are designed for continuous operation, with many systems offering adjustable power output to accommodate changing process conditions.For applications requiring very high power, multiple generators may also be combined to provide microwave energy to the same process.
4. Consider the Required Power-Control Range
Maximum output power tells only part of the story.
Many industrial processes require the ability to increase or decrease microwave power as operating conditions change.
Consider questions such as:
5. Choose Between an Integrated and Remote-Head Generator
Industrial microwave generators are available in different physical configurations.Two common configurations are integrated generators and remote-head generators.
Integrated Microwave Generator
An integrated generator houses the major generator components within a single cabinet.This approach can simplify installation and provide a self-contained microwave power source.
An integrated configuration may be appropriate when:
In a remote-head configuration, the magnetron head is separated from the power supply and connected using the appropriate interconnect cabling.
A remote-head design can provide greater flexibility when integrating microwave power into existing production equipment or when space near the applicator is limited. It can also allow the magnetron head to be positioned closer to the microwave process while other generator components remain in a more convenient location. When deciding between configurations, consider equipment layout, cable requirements, accessibility, maintenance, environmental conditions, and available floor space.
6. Determine Cooling Requirements
Industrial microwave generators generate significant heat and require proper thermal management.
Depending on the generator's power level, and magnetron, the system may use:
Before choosing a generator, verify that the facility can provide the required cooling capacity, water flow, water temperature, water quality, air flow, and environmental conditions specified for the equipment. Insufficient cooling can affect system reliability, magnetron performance, and component life.
Cooling requirements should therefore be considered early in the equipment-selection process rather than after a generator has been selected.
7. Evaluate the Waveguide and Power-Delivery System
Generating microwave energy is only part of the system.The energy must also be transferred efficiently and safely from the generator to the load.
This is typically accomplished through a microwave power-delivery system that may include components such as:
8. Account for Reflected Microwave Power
Not all microwave power generated by the system is necessarily absorbed by the load. Depending on the application and impedance match, some microwave energy may be reflected toward the generator.
Reflected power can change as:
Understanding both forward power and reflected power can provide valuable information about how effectively microwave energy is being delivered to the process.
9. Determine Your Control and Automation Requirements
Modern industrial microwave generators often operate as part of a larger automated production system. Before selecting a generator, determine how operators or external equipment will control it.
Consider whether you need:
10. Verify Electrical Requirements
Industrial microwave generators can have significant electrical requirements.
Before installation, verify:
Confirming these requirements early can prevent costly electrical modifications during installation.
11. Consider Safety and Interlocks
High-power microwave systems involve both microwave energy and potentially hazardous electrical voltages.
Safety must therefore be considered at the system level.Depending on the equipment and application, safety considerations may include:
Richardson Electronics provides technical resources covering microwave equipment safety as well as microwave power measurement and waveguide system configuration.
12. Think About Serviceability and Maintenance
Industrial equipment is often expected to operate for long periods with minimal downtime. Generator selection should therefore consider not only initial performance but also long-term serviceability.
Ask questions such as:
13. Consider Whether You Need a Standard or Custom Generator
Not every industrial microwave application can be addressed with an off-the-shelf generator.
OEMs, system integrators, research organizations, and industrial manufacturers may have requirements involving:
Richardson Electronics provides design and production services for custom microwave generator systems and can support system integration, prototype development, production, testing, and upgrades to existing systems.
Whether you are designing a new industrial microwave system or replacing an existing generator, understanding these requirements can help you select a microwave generator that provides the performance, reliability, and integration capabilities your application requires.
What Is an Industrial Microwave Generator?
An industrial microwave generator converts electrical energy into microwave energy for use in industrial heating, drying, plasma generation, material processing, and other applications.
A typical industrial microwave system consists of three primary elements:
- Microwave power generator – Produces the microwave energy.
- Power-delivery system – Transfers microwave energy from the generator to the process, typically through waveguide components.
- Load or process – The material, chamber, plasma, or other application receiving the microwave energy.
Selecting the right generator starts with understanding how each element interacts with your process.
1. Start With the Application
The first question to ask is:
What will the microwave energy be used to accomplish?
Industrial microwave generators are used across a wide variety of processes, including:
- Industrial heating
- Drying of materials
- Food heating and processing
- Vulcanization
- Polymerization
- Plasma generation
- Chemical vapor deposition (CVD)
- Plasma-enhanced chemical vapor deposition (PECVD)
- Diamond growth
- Thin-film deposition
- Surface treatment
- Gas abatement
- Gasification
- Research and development
Before selecting a generator, define the material or process being treated, desired process result, throughput, operating conditions, and whether the process will run continuously or intermittently.
2. Determine the Required Microwave Frequency
Frequency is one of the most important specifications when selecting an industrial microwave generator.
Common Industrial, Scientific and Medical (ISM) frequencies for microwave processing include 915 MHz and 2450 MHz (2.45 GHz). Other frequencies, including 896 MHz, 922 MHz, and 5.8 GHz, may also be used depending on the application and geographic requirements.
Richardson Electronics offers microwave generator solutions at standard ISM frequencies including 915 MHz and 2450 MHz.
915 MHz Microwave Generators
915 MHz systems are commonly associated with higher-power industrial microwave applications.
Richardson Electronics offers L-band generator solutions at 896 MHz, 915 MHz, and 922 MHz, with available systems reaching power levels up to 100 kW.
2450 MHz Microwave Generators
Richardson Electronics offers S-band generator solutions at 2450 MHz. 2450 MHz is widely used in industrial heating, plasma, laboratory, and processing applications.Richardson Electronics offers a range of 2450 MHz generator configurations and power levels up to 15kW for industrial applications.
Which Frequency Should You Choose?
Frequency selection should be based on several factors, including:
- Application
- Material properties
- Required penetration characteristics
- Process geometry
- Required microwave power
- Applicator or chamber design
- Existing waveguide components
- Regulatory requirements
- Geographic location
Not sure whether your application requires 915 MHz or 2450 MHz? Richardson Electronics' microwave engineering team can help evaluate your application requirements and configure an appropriate microwave system.
3. Calculate the Required Microwave Power
Once the operating frequency has been established, determine how much microwave power the process requires.
Industrial microwave generator power can range from relatively low-power systems to systems delivering tens or even hundreds of kilowatts.
The required power depends on factors such as:
- Material being processed
- Mass or volume of material
- Starting and target temperatures
- Desired heating rate
- Throughput
- Process efficiency
- Heat losses
- Process chamber design
- Continuous or batch operation
- Plasma requirements, if applicable
The objective is to provide sufficient controllable microwave power across the process's required operating range.
For example, Richardson Electronics' industrial microwave generators are designed for continuous operation, with many systems offering adjustable power output to accommodate changing process conditions.For applications requiring very high power, multiple generators may also be combined to provide microwave energy to the same process.
4. Consider the Required Power-Control Range
Maximum output power tells only part of the story.
Many industrial processes require the ability to increase or decrease microwave power as operating conditions change.
Consider questions such as:
- Does the process always operate at full power?
- Does power need to ramp gradually?
- Does the process require different recipes or operating conditions?
- Does the load change during processing?
- Does the system need to respond automatically to process conditions?
- How precisely must microwave output be controlled?
5. Choose Between an Integrated and Remote-Head Generator
Industrial microwave generators are available in different physical configurations.Two common configurations are integrated generators and remote-head generators.
Integrated Microwave Generator
An integrated generator houses the major generator components within a single cabinet.This approach can simplify installation and provide a self-contained microwave power source.
An integrated configuration may be appropriate when:
- Adequate space is available near the process.
- A self-contained generator is preferred.
- The installation does not require separation of the magnetron head and power supply.
In a remote-head configuration, the magnetron head is separated from the power supply and connected using the appropriate interconnect cabling.
A remote-head design can provide greater flexibility when integrating microwave power into existing production equipment or when space near the applicator is limited. It can also allow the magnetron head to be positioned closer to the microwave process while other generator components remain in a more convenient location. When deciding between configurations, consider equipment layout, cable requirements, accessibility, maintenance, environmental conditions, and available floor space.
6. Determine Cooling Requirements
Industrial microwave generators generate significant heat and require proper thermal management.
Depending on the generator's power level, and magnetron, the system may use:
- Air cooling
- Water cooling
- A combination of air and water cooling
Before choosing a generator, verify that the facility can provide the required cooling capacity, water flow, water temperature, water quality, air flow, and environmental conditions specified for the equipment. Insufficient cooling can affect system reliability, magnetron performance, and component life.
Cooling requirements should therefore be considered early in the equipment-selection process rather than after a generator has been selected.
7. Evaluate the Waveguide and Power-Delivery System
Generating microwave energy is only part of the system.The energy must also be transferred efficiently and safely from the generator to the load.
This is typically accomplished through a microwave power-delivery system that may include components such as:
- Waveguide
- Circulators
- Isolators
- Directional couplers
- Tuners
- Dummy loads
- Power-measurement components
- Transitions
- Bends
- Flexible waveguide
- Applicators or process chambers
8. Account for Reflected Microwave Power
Not all microwave power generated by the system is necessarily absorbed by the load. Depending on the application and impedance match, some microwave energy may be reflected toward the generator.
Reflected power can change as:
- Material temperature changes.
- Moisture content changes.
- The load moves through the system.
- Plasma conditions change.
- Process conditions vary.
Understanding both forward power and reflected power can provide valuable information about how effectively microwave energy is being delivered to the process.
9. Determine Your Control and Automation Requirements
Modern industrial microwave generators often operate as part of a larger automated production system. Before selecting a generator, determine how operators or external equipment will control it.
Consider whether you need:
- Local controls
- Remote controls
- Analog control
- Digital control
- PLC integration
- Power monitoring
- Fault monitoring
- Forward and reflected power monitoring
- Interlocks
- Automated process control
10. Verify Electrical Requirements
Industrial microwave generators can have significant electrical requirements.
Before installation, verify:
- Available line voltage
- Phase requirements
- Input power
- Facility electrical capacity
- Disconnect requirements
- Grounding
- Applicable electrical standards
Confirming these requirements early can prevent costly electrical modifications during installation.
11. Consider Safety and Interlocks
High-power microwave systems involve both microwave energy and potentially hazardous electrical voltages.
Safety must therefore be considered at the system level.Depending on the equipment and application, safety considerations may include:
- Microwave leakage
- High-voltage protection
- Access-panel interlocks
- Door interlocks
- Cooling-system interlocks
- Waveguide connections
- Emergency shutdown
- Fault detection
- Proper grounding
- Operator training
Richardson Electronics provides technical resources covering microwave equipment safety as well as microwave power measurement and waveguide system configuration.
12. Think About Serviceability and Maintenance
Industrial equipment is often expected to operate for long periods with minimal downtime. Generator selection should therefore consider not only initial performance but also long-term serviceability.
Ask questions such as:
- How easily can the magnetron be replaced?
- Are replacement magnetrons readily available?
- Are critical spare parts available?
- Can components be accessed without extensive equipment disassembly?
- Is technical support available?
- Can the generator be serviced in the field?
- Is the system modular?
- What preventive maintenance is recommended?
13. Consider Whether You Need a Standard or Custom Generator
Not every industrial microwave application can be addressed with an off-the-shelf generator.
OEMs, system integrators, research organizations, and industrial manufacturers may have requirements involving:
- Custom mechanical configurations
- Special control interfaces
- Unique power levels
- Specialized cooling
- Different waveguide interfaces
- Existing equipment integration
- Geographic electrical requirements
- Prototype systems
- Complete turnkey microwave subsystems
Richardson Electronics provides design and production services for custom microwave generator systems and can support system integration, prototype development, production, testing, and upgrades to existing systems.
