Description:
Mi-Wave’s 460 Series Bandpass Filters are used for narrow and wideband applications. This design is well suited for frequency diplexers used in communication systems or any application where narrow bandwidths are required.
The 460 Series Bandpass filter can be designed from 18 to 110GHz. Please consult Mi-Wave for further dimensions and specific technical data.
Mi-Wave’s 460 Series Bandpass Filters are precision waveguide filters designed to pass a desired range of frequencies while rejecting unwanted signals outside the specified passband. By providing selective frequency transmission and high out-of-band attenuation, these filters help improve signal integrity, reduce interference, and protect sensitive RF system components.
Bandpass filters are essential building blocks in RF, microwave, and millimeter-wave systems where multiple signals, harmonics, spurious emissions, and adjacent-channel interference may be present. By allowing only the desired frequency range to pass while suppressing unwanted energy, they help improve receiver sensitivity, transmitter performance, and overall system reliability.
The 460 Series is available across frequency bands from approximately 8 GHz to 140 GHz and supports both narrowband and wideband configurations. These filters are commonly integrated into satellite communications systems, radar platforms, telemetry networks, electronic warfare systems, test and measurement equipment, and advanced research applications where precise frequency control is required.
Engineered with precision-machined waveguide structures, Mi-Wave bandpass filters provide low insertion loss, low VSWR, high rejection levels, and repeatable electrical performance. Standard waveguide interfaces allow straightforward integration into existing RF architectures, while custom center frequencies, bandwidths, rejection levels, and mechanical configurations are available to meet specialized application requirements.
How a Bandpass Filter Works
Bandpass Filter Signal Flow
Desired Signal + Noise + Harmonics
Bandpass Filter
Desired Frequency Band
Key Performance Features
Mi-Wave’s 460 Series Bandpass Filters are precision-engineered to provide reliable frequency selectivity, low signal loss, and excellent interference suppression across RF, microwave, and millimeter-wave systems. Designed for laboratory, commercial, aerospace, and defense applications, these filters deliver repeatable performance across a broad range of operating environments.
Broadband Frequency Coverage
Available across frequency bands from approximately 8 GHz to 140 GHz, supporting microwave and millimeter-wave systems with standard waveguide interfaces.
Narrowband and Wideband Filter Options
Offered in configurations with typical bandwidths ranging from 1% to 10% of center frequency, allowing designers to balance selectivity, insertion loss, and system requirements.
Low Insertion Loss
Optimized filter designs minimize signal attenuation within the passband, helping preserve receiver sensitivity, improve signal-to-noise ratio, and maximize overall system performance.
Low VSWR and Excellent Impedance Matching
Maintains efficient RF power transfer with minimal reflections, reducing mismatch losses and supporting stable operation throughout the specified frequency range.
High Out-of-Band Rejection
Provides strong suppression of unwanted signals, harmonics, image frequencies, and adjacent-channel interference to improve spectral purity and receiver protection.
Sharp Frequency Selectivity
Engineered to provide precise passband control and rapid attenuation outside the desired frequency range, helping improve channel isolation and reduce unwanted signal leakage.
Standard Waveguide Compatibility
Available with industry-standard WR-series waveguide interfaces for straightforward integration into existing RF, microwave, and millimeter-wave systems.
Precision-Machined Construction
Manufactured using high-precision machining techniques to ensure dimensional accuracy, consistent electrical performance, and long-term reliability.
Thermal and Mechanical Stability
Robust metal housing construction helps maintain filter performance across changing environmental conditions, temperature variations, and demanding operating environments.
Repeatable RF Performance
Designed for consistent electrical characteristics from unit to unit, making the 460 Series suitable for production systems, laboratory measurements, calibration setups, and field-deployed platforms.
Custom Configurations Available
Mi-Wave can provide custom center frequencies, bandwidths, rejection levels, waveguide sizes, flange types, and packaging configurations to support specialized application requirements.
Applications for 460 Series Bandpass Filters
The MIWV 460 Series Bandpass Filters are designed for integration into a wide range of RF, microwave, and millimeter-wave systems where precise frequency selection, interference suppression, and signal integrity are essential. These filters are commonly used in both commercial and defense-grade platforms, supporting fixed, mobile, airborne, and space-constrained applications.
Satellite Communications (SatCom)
460 Series bandpass filters are widely used in satellite communication systems to isolate uplink and downlink frequency bands, suppress out-of-band interference, and protect sensitive receiver components.
Typical SatCom applications include:
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Ground-based satellite terminals and gateway stations
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Airborne and maritime SatCom platforms
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Ka-band and Q-band satellite uplinks and downlinks
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Payload frequency management and channel isolation
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Interference mitigation in crowded satellite frequency allocations
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Protection of LNAs, BUCs, and frequency converters
These filters help improve link stability, reduce noise, and maintain regulatory compliance in high-density satellite environments.
Radar Systems
In radar applications, 460 Series bandpass filters are used to improve target detection, reduce clutter, and protect receiver front ends from unwanted signals.
Common radar uses include:
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Fire-control and target-tracking radar
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Surveillance and perimeter monitoring radar
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Imaging and high-resolution radar systems
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Ground-based, airborne, and maritime radar platforms
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Harmonic suppression in high-power radar transmit chains
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Receiver protection from strong out-of-band signals
By tightly controlling the radar operating band, these filters enhance signal-to-noise ratio and overall system performance.
Electronic Warfare and Signal Intelligence (EW / SIGINT)
Electronic warfare and SIGINT systems require high selectivity and strong out-of-band rejection, making the 460 Series well suited for these mission-critical applications.
Use cases include:
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Threat signal isolation and monitoring
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Interference and jamming mitigation
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Spectrum surveillance and signal collection
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Front-end filtering for wideband receivers
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Channelized receivers and frequency-selective architectures
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Protection of sensitive EW receiver chains
The robust mechanical construction and repeatable RF performance make these filters suitable for deployed EW systems.
RF Upconversion and Downconversion Chains
460 Series Bandpass Filters are commonly integrated into frequency conversion architectures to remove unwanted mixer products and spurious signals.
Applications include:
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RF upconverters and downconverters
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Block upconverters (BUCs) and low-noise block downconverters (LNBs)
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Intermediate frequency (IF) and RF stage filtering
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Harmonic and image rejection after mixing stages
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Clean signal generation for transmit chains
These filters help maintain spectral purity and prevent interference between system stages.
Test and Measurement Systems
In laboratory and production environments, 460 Series bandpass filters are used to ensure accurate, repeatable measurements at high frequencies.
Typical test applications include:
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Millimeter-wave test benches and calibration setups
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Signal generators and spectrum analyzers
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Automated test equipment (ATE)
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Device characterization and validation
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Noise figure and linearity measurements
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Production testing of RF and mmWave components
Their stable performance makes them ideal for R&D and manufacturing environments.
High-Data-Rate Wireless and Point-to-Point Links
460 Series bandpass filters support high-frequency wireless communication systems where spectral efficiency and interference control are critical.
Applications include:
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Point-to-point microwave and millimeter-wave backhaul
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Fixed wireless access (FWA) systems
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High-capacity data links
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Short-range high-bandwidth communication systems
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Experimental and emerging wireless technologies
These filters help maintain link reliability in dense RF environments.
Scientific, Aerospace, and Research Applications
460 Series filters are also used in scientific instrumentation and advanced research platforms that operate at microwave and millimeter-wave frequencies.
Examples include:
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Radio astronomy and remote sensing systems
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Atmospheric and environmental monitoring instruments
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University and government research laboratories
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Spaceborne and airborne experimental payloads
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Advanced sensing and imaging platforms
System Protection and Interference Mitigation
Across all industries, 460 Series Bandpass Filters are used to:
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Protect sensitive RF receivers from overload
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Suppress out-of-band noise and interference
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Improve system dynamic range
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Maintain compliance with spectral regulations
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Enhance overall RF system reliability
Frequently Asked Questions (FAQ)
What is a bandpass filter?
A bandpass filter is an RF component that allows a specific range of frequencies to pass while attenuating signals above and below the desired frequency range. Bandpass filters are used to improve signal quality, reduce interference, and protect sensitive RF equipment.
What are bandpass filters used for?
Bandpass filters are commonly used in:
- Satellite communications (SatCom)
- Radar systems
- Telemetry networks
- Electronic warfare systems
- RF and microwave test equipment
- Wireless communication systems
- Research and development laboratories
- Millimeter-wave sensing and imaging systems
What frequency range do Mi-Wave 460 Series Bandpass Filters support?
The 460 Series is available across frequency bands from approximately 8 GHz to 140 GHz, covering many microwave and millimeter-wave applications.
Why are bandpass filters important in RF systems?
Bandpass filters help remove unwanted signals, harmonics, noise, and adjacent-channel interference. This improves receiver sensitivity, signal integrity, and overall system performance.
What is center frequency?
The center frequency is the midpoint of the filter’s passband and represents the primary operating frequency around which the filter is designed.
What is bandwidth?
Bandwidth is the range of frequencies that the filter allows to pass with minimal attenuation. It is typically defined by the upper and lower cutoff frequencies.
What is percent bandwidth?
Percent bandwidth expresses the filter bandwidth as a percentage of the center frequency and is commonly used to compare filters operating at different frequency ranges.
What is insertion loss?
Insertion loss is the amount of signal power lost as RF energy passes through the filter. Lower insertion loss helps maintain signal strength and system sensitivity.
What is out-of-band rejection?
Out-of-band rejection refers to the filter’s ability to attenuate unwanted frequencies outside the passband. Higher rejection improves interference suppression and signal purity.
What is VSWR?
Voltage Standing Wave Ratio (VSWR) is a measurement of impedance matching quality. Lower VSWR values indicate reduced reflections and more efficient RF power transfer.
How does a bandpass filter improve receiver performance?
By rejecting unwanted signals before they reach sensitive receiver components, a bandpass filter helps reduce noise, prevent overload conditions, and improve overall receiver sensitivity.
Can bandpass filters suppress harmonics?
Yes. Bandpass filters are commonly used to suppress harmonic frequencies, spurious emissions, and unwanted signals generated by transmitters, mixers, amplifiers, and frequency converters.
What is the difference between narrowband and wideband filters?
Narrowband filters provide tighter frequency selectivity and higher rejection near the passband, while wideband filters allow a larger frequency range to pass and may offer lower insertion loss.
How is filter selectivity measured?
Filter selectivity is determined by how quickly the filter attenuates frequencies outside the passband. Higher selectivity provides better separation between desired and undesired signals.
What waveguide interfaces are available?
460 Series Bandpass Filters are available with standard WR-series waveguide interfaces matched to the operating frequency band.
Are these filters suitable for millimeter-wave applications?
Yes. The 460 Series is specifically designed for microwave and millimeter-wave systems operating through frequencies as high as 140 GHz.
Can Mi-Wave customize bandpass filters?
Yes. Custom configurations are available for:
- Center frequency
- Bandwidth
- Rejection levels
- Waveguide sizes
- Flange types
- Mechanical packaging
- Environmental requirements
How do I select the right bandpass filter?
When selecting a bandpass filter, engineers typically consider:
- Operating frequency
- Required bandwidth
- Insertion loss limits
- Rejection requirements
- Power handling needs
- Waveguide interface compatibility
- Environmental conditions
What industries use bandpass filters?
Bandpass filters are widely used in:
- Aerospace and defense
- Satellite communications
- Telecommunications
- Radar and sensing
- Test and measurement
- Research institutions
- Government laboratories
- Commercial wireless systems
Can the same filter be used for transmit and receive paths?
In many applications, yes. However, filter selection depends on frequency range, power levels, insertion loss requirements, and system architecture. Separate transmit and receive filters are often used when different passbands or performance requirements are needed.
Bandpass Filter Calculators
Estimate common RF filter values for preliminary system planning, including bandwidth, Q factor, wavelength, return loss, and insertion loss power.
Bandwidth From Center Frequency
Percent Bandwidth
Q Factor
Wavelength
VSWR to Return Loss
Insertion Loss Power
Glossary of RF Bandpass Filter Terms
Core Frequency Definitions
Passband
The frequency range transmitted through the bandpass filter with minimal attenuation. Signals within the passband experience low insertion loss and are preserved for further processing in the RF signal chain.
Stopband
Frequency ranges outside the passband that are strongly attenuated by the filter. Stopbands are designed to suppress unwanted signals, noise, harmonics, and interference.
Cutoff Frequency
The frequency at which signal attenuation reaches a specified reference level relative to the passband, most commonly 3 dB. The lower cutoff frequency (f1) and upper cutoff frequency (f2) define the edges of the passband.
Center Frequency (fc)
The midpoint of the passband, calculated from the lower and upper cutoff frequencies. Center frequency is used as a reference for defining filter performance, bandwidth, and fractional bandwidth.
Bandwidth and Selectivity
Bandwidth (BW)
The width of the passband, defined as the difference between the upper and lower cutoff frequencies (f2 − f1). Bandwidth directly impacts channel selectivity and interference rejection.
Fractional Bandwidth (FBW)
Bandwidth normalized to center frequency (BW/fc). Fractional bandwidth is commonly expressed as a percentage and is widely used in RF specifications, datasheets, and RFQs to compare filters operating at different frequency ranges.
Q Factor
A measure of filter selectivity related to the ratio of center frequency to bandwidth (fc/BW). Higher Q indicates a narrower passband and greater selectivity.
Loss and Matching Parameters
Insertion Loss (S21)
The amount of signal power lost through the filter within the passband, typically measured in decibels. Low insertion loss is critical for maintaining system noise figure, signal strength, and link margin.
Return Loss (S11)
A measure of reflected RF power caused by impedance mismatch at the filter input or output. Higher return loss values indicate better impedance matching and lower reflections.
VSWR (Voltage Standing Wave Ratio)
A ratio derived from the reflection coefficient that indicates impedance matching quality. Lower VSWR values correspond to improved power transfer and reduced stress on RF components such as amplifiers and mixers.
Rejection and Interference Control
Out-of-Band Rejection
The attenuation provided outside the passband to suppress unwanted signals, harmonics, spurious emissions, image frequencies, and adjacent-channel interference. High out-of-band rejection is critical in dense RF environments.
Skirt Selectivity
The steepness of attenuation at the edges of the passband. Steeper skirts indicate higher selectivity and improved separation between desired and undesired signals.
Filter Structures and Implementations
Waveguide Bandpass Filter
A bandpass filter implemented using waveguide resonant structures to achieve low insertion loss, high power handling, and stable performance at microwave and millimeter-wave frequencies. Commonly used in SatCom, radar, and aerospace systems.
Cavity Filter
A type of bandpass filter that uses metallic resonant cavities to define the passband and rejection characteristics, offering excellent selectivity and power handling.
Resonator
A structure within a filter that stores electromagnetic energy at a specific frequency. Multiple resonators are coupled together to form a bandpass filter response.
Measurement and Performance Metrics
S-Parameters
Scattering parameters used to characterize RF components. For bandpass filters, S11 represents input reflection (return loss) and S21 represents forward transmission (insertion loss).
Insertion Loss Flatness
The variation of insertion loss across the passband. Low ripple or flat insertion loss is important for maintaining consistent signal amplitude.
Group Delay
The frequency-dependent time delay introduced by the filter. Excessive group delay variation can distort wideband or digitally modulated signals.
Application and System-Level Terms
Receiver Front-End Protection
The use of bandpass filters to prevent strong out-of-band signals from overloading low-noise amplifiers and mixers.
Image Frequency Rejection
Suppression of unwanted image frequencies generated in frequency conversion stages.
Harmonic Suppression
Reduction of harmonic signals produced by nonlinear RF components.
Spectral Compliance
Ensuring transmitted signals meet regulatory emission and spectral mask requirements.
| Min Passband Frequency (GHz) | Max Passband Frequency (GHz) | Min Rejection Frequency Low (GHz) | Max Rejection Frequency Low (GHz) | Min Rejection Frequency High (GHz) | Max Rejection Frequency High (GHz) | Rejection (dB) | Waveguide Port |
|---|---|---|---|---|---|---|---|
| 22 | 32 | DC | 18 | 37 | 75 | 40 | WR-28 |
| 22 | 35 | DC | 20 | 40 | 72 | 40 | WR-28 |
| 22 | 38 | DC | 19.6 | 41 | 45 | 50 | WR-28 |
| 22 | 42 | DC | 20 | 48 | 95 | 60 | WR-28 |
| 27.5 | 32.5 | DC | 23.5 | 36.5 | 41.5 | 40 | WR-28 |
| 29 | 35 | DC | 27 | 37 | 45 | 40 | WR-28 |
| 30 | 45 | DC | 28 | 47 | 90 | 40 | WR-22 |
| 30 | 50 | DC | 25 | 56 | 100 | 40 | WR-22 |
| 32 | 38 | DC | 28 | 40 | 46 | 40 | WR-28 |
| 33 | 37 | DC | 31 | 39 | 46 | 40 | WR-28 |
| 33 | 50 | DC | 25 | 56 | 60 | 40 | WR-22 |
| 34 | 67 | DC | 30 | 69 | 120 | 40 | WR-19 |
| 35.26 | 36.26 | DC | 33.9 | 38 | 45 | 40 | WR-28 |
| 36 | 60 | DC | 29 | 66 | 120 | 40 | WR-19 |
| 40 | 50 | DC | 34 | 57 | 65 | 60 | WR-22 |
| 43 | 46 | DC | 42 | 47 | 55 | 30 | WR-22 |
| 47 | 57 | DC | 44 | 62 | 85 | 40 | WR-15 |
| 47 | 59 | DC | 44 | 63 | 78 | 50 | WR-15 |
| 49.75 | 50.25 | DC | 49 | 51 | 60 | 30 | WR-15 |
| 50 | 75 | DC | 44 | 80 | 110 | 40 | WR-15 |
| 51 | 55 | DC | 45 | 61 | 80 | 40 | WR-15 |
| 51.5 | 54.5 | DC | 44 | 62 | 70 | 40 | WR-15 |
| 53.5 | 54.5 | DC | 52 | 55 | 65 | 40 | WR-15 |
| 54.5 | 56.5 | DC | 53 | 57 | 70 | 50 | WR-15 |
| 55.75 | 56.25 | DC | 54.75 | 57.5 | 70 | 40 | WR-15 |
| 70 | 90 | DC | 60 | 93.3 | 130 | 40 | WR-12 |
| 71 | 76 | DC | 67 | 81 | 105 | 50 | WR-10 |
| 71 | 76 | DC | 67 | 81 | 105 | 50 | WR-12 |
| 73 | 76 | DC | 67 | 82 | 100 | 40 | WR-12 |
| 74 | 76 | DC | 70 | 80 | 100 | 40 | WR-12 |
| 75 | 78 | DC | 71 | 82 | 100 | 50 | WR-12 |
| 76 | 77 | DC | 74.5 | 78.5 | 90 | 50 | WR-10 |
| 76 | 81 | DC | 73 | 84 | 105 | 40 | WR-12 |
| 81 | 86 | DC | 78 | 88 | 120 | 50 | WR-10 |
| 81 | 86 | DC | 78 | 90 | 120 | 50 | WR-12 |
| 81 | 87 | DC | 78 | 90 | 120 | 30 | WR-12 |
| 82.5 | 85.5 | DC | 79 | 93.5 | 110 | 40 | WR-10 |
| 82.5 | 87 | DC | 80 | 90 | 120 | 40 | WR-12 |
| 90 | 98 | DC | 88 | 102 | 110 | 25 | WR-10 |
| 92 | 96 | DC | 90 | 98 | 130 | 40 | WR-10 |
| 92 | 100 | DC | 88 | 104 | 110 | 50 | WR-10 |
| 92.5 | 95.5 | DC | 91.5 | 97 | 97.5 | 20 | WR-10 |
| 93.2 | 95.2 | DC | 91 | 98.5 | 105 | 40 | WR-10 |
| 98 | 102 | DC | 95 | 105 | 110 | 40 | WR-10 |
Interested in this product or other Mi-Wave solutions?
Contact our team to discuss your frequency range, interface needs, and application requirements.
Custom configurations are available for specialized RF, microwave, and millimeter-wave systems.
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