The OneFiltr film, in words

  1. The world is full of signals. We only want one.
  2. A filter passes one frequency and blocks the rest. But when the signal moves, a fixed filter cannot follow.
  3. The traditional answer is one filter per band, with switches between them. A phone can contain more than 100 RF filters, just to manage the spectrum.
  4. More bands, more filters, more switches, more complexity.
  5. What if one filter could replace the bank? OneFiltr.
  6. The filter moves to the signal: one device, continuously re-tuned by its magnetic bias.
  7. Filter and directional control: signals pass one way and are isolated in the other.
  8. Tune with a pulse. Hold without power: a zero-static-power magnetic bias.
  9. From precision YIG spheres to microfabricated YIG — OneFiltr estimates more than 2,000 filters per 3-inch wafer.
  10. OneFiltr prototype: 13 g and 1 cm³, compared with 278 g and 80 cm³ for commercial YIG tunable filters.
  11. OneFiltr. One radio frequency filter is all you need, with no static energy required.
01 · Spectrum00:00 / 00:44
Skip to the website ↓

One tunable RF filter, where a bank of fixed filters, switches and isolators used to be.

OneFiltr is developing a continuously tunable, nonreciprocal YIG filter. Its passband is set by a magnetic field, so the same device moves to whatever frequency you need. A zero-static-power magnetic bias holds that field without continuous current, and microfabricated YIG replaces hand-aligned YIG spheres.

Explore the technologyTalk to us
  • 4.0–17.7 GHzcontinuous tuning with >25 dB nonreciprocity, 3–5 dB insertion loss in one 1.07 cm³ deviceMeasured · peer-reviewed Nature Communications 2026
  • 0 mWstatic power to hold a tuned frequency. Energy is used only while re-tuning, during a short current pulse.Datasheet spec Nature Communications 2024
  • 13 g · 1 cm³OneFiltr prototype, compared with 278 g and 80 cm³ for two commercial YIG tunable filtersOneFiltr-stated OneFiltr comparison

01 — Why RF filtering breaks at scale

Every new band has meant another fixed filter, and another switch to reach it.

A fixed filter passes one band. To cover more bands, front ends add more filters, plus switch networks to route the signal to the right one. OneFiltr notes that a cell phone already relies on more than 100 individual RF filters, and that as systems move to higher bands, larger filter–switch networks cost performance, space and loss. 6G and wideband systems need even more coverage.

Fixed filter bank · one filter per band

Antenna
SwitchSP20T
SwitchSP20T
Isolator
Receiver
Fixed filters
20
Switch throws to reach them
40

OneFiltr · one tunable, nonreciprocal filter

Antenna
OneFiltrtunable · nonreciprocal
Receiver
Tunable filters
1
Re-tuned by
magnetic bias pulse

Conceptual Simplified for clarity. Real front ends also contain amplifiers, mixers and duplexers, and architectures vary. The claim illustrated is OneFiltr’s: one continuously tunable, nonreciprocal filter can take the place of banks of RF filters, switches and isolators. Band counts from onefiltr.com.

02 — How it works

Three ideas, one device.

Select a part of the device to see what it does. Press Send tuning pulse to re-tune the filter and watch what happens to the field, the passband and the power.

NdFeBNdFeBAlNiCo + coilAlNiCo + coilYIG cavitySignal inSignal out010203
048121620 GHz4.0 GHz
Coil currentHolding: 0 mW

Conceptual Architecture redrawn from OneFiltr’s technology diagram. Not to scale. Tuning positions and passband width are illustrative.

The frequency is set by a magnetic field, not by the geometry.

Yttrium iron garnet (YIG) carries magnetostatic spin waves. Their frequency depends on the magnetic bias field: stronger field, higher frequency. Change the field and the passband moves, continuously and across octaves.

OneFiltr launches magnetostatic surface waves (MSSW) into a YIG film using metal transducers (meander-line and half-cone designs in its papers). MSSW travelling in opposite directions concentrate toward opposite faces of the film, so transducers on one face couple strongly in one direction and weakly in the other. That gives nonreciprocal transmission: the same device filters and isolates.

  • >25 dBnonreciprocity, 4.0–17.7 GHz deviceMeasured · peer-reviewed Nature Comms 2026
  • 100–200 MHz3 dB bandwidth, same deviceMeasured · peer-reviewed Nature Comms 2026
  • ~5×loaded Q of planar YIG resonators vs spheres (>1000 vs ~200), as reported in the literatureIndustry / literature cited by OneFiltr

03 — Performance

The numbers, one device at a time.

OneFiltr’s research has produced several different devices, each optimized for something different: tuning range, loss, rejection or nonreciprocity. Each row below is one measured device, with its own source. These values are not simultaneous properties of a single product. For product numbers, see the evaluation datasheet.

Measured · peer-reviewedMeasured · accepted, in pressOneFiltr-statedPreliminary specTarget specIndustry / literature

Nonreciprocal bandpass · Nature Communications 2026

Wideband tunable, nonreciprocal MSSW bandpass

Measured · peer-reviewed Read the paper
Tuning
4.0–17.7 GHz, continuous
Nonreciprocity
>25 dB
Insertion loss
3–5 dB
Out-of-band rejection
>30 dB
3 dB bandwidth
100–200 MHz
P1dB
>10.4 dBm
IIP3
>26 dBm
Volume
1.07 cm³
YIG
18 µm microfabricated film

Additional figures OneFiltr states OneFiltr-stated

These appear in OneFiltr’s site copy. Where the device or test conditions are not given, we say so.

Re-tuning time
<1 ms; max. 100 µs from 3 to 18 GHzApplications page. Device/configuration not specified there.
Out-of-band rejection
>50 dBApplications page (wideband receiver).
Notch filter
>20 dB rejection, 3–32 GHz, <2 dB insertion lossTechnology page, chip-level measurements.
Size & weight
13 g, 1 cm³ vs 278 g, 80 cm³Prototype vs two commercial YIG tunable filters (Technology page).
Holding power
0 (zero static power)Energy is used only during the tuning current pulse.

04 — Compare

How the approaches trade off.

No checkmarks. Each cell says what is known and where it comes from. Cells labelled “Conceptual” are general engineering context, not measurements.

PropertyYIG-sphere tunable filterVaractor tunable filterSwitched filter bankOneFiltr
TuningContinuous, wide rangeOneFiltr-stated OneFiltr: wide tuning range, high QContinuous within sub-bandsOneFiltr-stated OneFiltr overlay of ADI ADMV8432 low/high bandsDiscrete: only the channels built inOneFiltr-stated OneFiltr: limited frequency-channel selectionContinuous. 4.0–17.7 GHz in one nonreciprocal device. Up to 32 GHz in other designsMeasured · peer-reviewed Nature Comms 2026; IMS 2025
SelectivityNarrow. Preselectors typically 35–80 MHzIndustry / literature Keysight, cited by OneFiltrWide passbands (multi-GHz in OneFiltr’s overlay)OneFiltr-stated OneFiltr overlayFixed per filter. HPF/LPF combinations are wideOneFiltr-stated OneFiltr overlay of ADI ADMV8818100–200 MHz 3 dB bandwidthMeasured · peer-reviewed Nature Comms 2026 device
Insertion lossPreselectors typically 6–8 dB. Notch up to ~3 dBIndustry / literature Keysight / OneFiltrHigher than OneFiltr in OneFiltr’s overlaysOneFiltr-stated OneFiltr overlayFilter loss plus every switch in the pathConceptual ArchitectureBandpass 2–5.4 dB depending on design. Notch <0.9 dB (ISSCC 2026)Measured · peer-reviewed Range across devices: see Performance
Holding powerContinuous electromagnet current, multi-wattOneFiltr-stated OneFiltrBias voltage onlyConceptual GeneralSwitch control powerConceptual General0 mW static. Energy only during the tuning pulsePreliminary spec Gen 1 datasheet
Size & weight278 g · 80 cm³ for the two units OneFiltr comparedOneFiltr-stated OneFiltr comparisonSmall, IC-scaleConceptual GeneralGrows with every band addedConceptual Architecture13 g · 1 cm³ prototype. 2 cc evaluation moduleOneFiltr-stated OneFiltr; datasheet
Re-tuning time~2 ms per 1 GHz step to ±10 MHz (typical)OneFiltr-stated OneFiltr, ApplicationsElectrically tunedConceptual GeneralFast switching, but only between fixed channelsConceptual Architecture<1 ms. Max. 100 µs from 3 to 18 GHzOneFiltr-stated OneFiltr, Applications
LinearityExcellent linearityOneFiltr-stated OneFiltrLimited power handlingOneFiltr-stated OneFiltr comparison chartDepends on the filter technologyConceptual GeneralOut-of-band IIP3 >41 dBm (2024 device). Datasheet: >60 dBmMeasured · peer-reviewed Nature Comms 2024; datasheet
Directional controlNot claimedConceptual —Reciprocal passive circuitConceptual PhysicsReciprocal; isolators added separatelyConceptual Architecture>25 dB nonreciprocity built inMeasured · peer-reviewed Nature Comms 2026 device
ManufacturingPrecision spheres, hundreds of $ each, several per filterOneFiltr-stated OneFiltrSemiconductor ICConceptual GeneralBill of materials scales with bandsConceptual ArchitectureWafer-level YIG. >2,000 filters per 3-inch wafer (estimate)OneFiltr-stated OneFiltr

Comparative overlays referenced here (Micro Lambda MLBFP-42018, ADI ADMV8432, HMC892A, ADMV8416, ADMV8818) are OneFiltr’s published measurement comparisons on onefiltr.com/technology.

05 — Applications

Where it sits in the signal chain.

OneFiltr targets size-, weight- and power-limited platforms in four areas. For each, here is the insertion point and what changes.

Wideband receivers

Direct-sampling receivers remove analog down-conversion, but wideband ADCs have limited input swing and lower dynamic range. A sharp, tunable filter in front of the ADC lets the wanted channel through and keeps strong out-of-band signals out.

  1. Antenna
  2. OneFiltr
  3. LNA
  4. ADC
  5. DSP
0-20-40-60-80048121620 GHzdB (relative)ADC headroom limit (illustrative)

Only the wanted channel reaches the ADC.

Conceptual Signal levels are illustrative. The filter is drawn with the Gen 1 preliminary figures: >40 dB stopband rejection, 3–5 dB loss, tuning 4–12 GHz.

06 — The science behind OneFiltr

Published, peer-reviewed, and open to checking.

OneFiltr comes out of research by Prof. Troy Olsson, Prof. Mark Allen and Prof. Firooz Aflatouni’s groups at the University of Pennsylvania. Every performance claim on this site links back to one of these papers.

  1. IEEE IMFW2024

    Magnetostatic Wave Notch Filters Frequency Tuned via a Zero DC Power Magnetic Bias Circuit

    A 1.7 cm³ tunable notch (3.3–10.3 GHz), <1.8 dB loss, >38 dB notch depth, tuned by transient pulses.

    Du, Yao, Ding, Yu, Geers, Aflatouni, Allen, Olsson

    Measured · peer-reviewed
  2. Nature Communications 15, 35822024

    Frequency Tunable Magnetostatic Wave Filters with Zero Static Power Magnetic Biasing Circuitry

    The founding result: a <2 cc MSW bandpass tunable 3.4–11.1 GHz with zero static power.

    Du, Idjadi, Ding, Zhang, Geers, Yao, Pyo, Aflatouni, Allen, Olsson

    Measured · peer-reviewed
  3. IEEE IMS2024

    Meander Line Transducer Empowered Low-Loss Tunable Magnetostatic Wave Filters with Zero Static Power Consumption

    Meander-line transducers that lower the loss of tunable MSW filters.

    Du, Yao, Ding, Yu, Geers, Aflatouni, Allen, Olsson

    Measured · peer-reviewed
  4. IEEE Magnetics Letters2025

    A Tunable Magnetic Bias Circuit with Zero Static Power Consumption

    NdFeB + AlNiCo V + coil: a 0.27 cm³ bias circuit tunable 3.7–288.5 mT that holds its field unpowered.

    Ding, Wang, Allen

    Measured · peer-reviewed
  5. IEEE IMS2025

    A Magnetostatic Surface Wave Filter Tunable Over 8–32 GHz Realized in Thickness-Scaled Yttrium Iron Garnet

    15 µm YIG extends MSSW filtering to 32 GHz with 2.5–5.4 dB loss.

    Du, Yao, Wu, Chang, Olsson

    Measured · peer-reviewed
  6. Applied Physics Letters 127(25)2025

    Stress Tunable Multiferroic Magnetic Circuit: The Magnetic Rheostat

    A stress-tuned magnetic circuit — another route to adjustable bias fields.

    Mion, Staruch, Jones, Yoo, Olsson, Allen, Finkel

    Measured · peer-reviewed
  7. ISSCC · 28.22026

    High-Selectivity, Tunable Filters with Zero Static Power Consumption Formed Using Micromachined Magnetostatic Wave Cavities

    Micromachined cavities: bandpass 3.3–9.7 GHz (2–3 dB, >35 dB rejection) and notch 3.5–16.8 GHz (<0.9 dB) on a 1.2 cc bias circuit.

    Yao, Du, Ding, Wu, Chang, Allen, Olsson

    Measured · peer-reviewed
  8. Nature Communications2026

    A Wideband Tunable, Non-reciprocal Bandpass Filter Using Magnetostatic Surface Waves with Zero Static Power Consumption

    Filter + isolator in one 1.07 cm³ device: 4.0–17.7 GHz, >25 dB nonreciprocity, 3–5 dB loss.

    Du, Ding, Yao, Ding, Lu, Wu, Chang, Wang, Allen, Olsson

    Measured · peer-reviewed
  9. Microsystems & Nanoengineering2026

    Spatially Tailored Spin Wave Excitation for Spurious-Free, Low-Loss Magnetostatic Wave Filters with Ultra-Wide Frequency Tunability

    Half-cone transducers: 9.8–31.5 GHz dual-cavity tuning at 2.9–3.8 dB loss.

    Wu, Yao, Du, Chang, Olsson

    Measured · peer-reviewed
  10. IEEE IMS (accepted)Accepted

    A 4–18 GHz Tunable Magnetostatic Surface Wave Nonreciprocal Filter with Zero-Static-Power Consumption Optimized for High Out-of-Band Rejection

    A nonreciprocal design tuned for stopband depth, benchmarked by OneFiltr against a commercial YIG-sphere filter.

    Du, Yao, Ding, Lu, Wu, Chang, Allen, Olsson

    Measured · accepted, in press
  11. IEEE IMS (accepted)Accepted

    Low-Loss, Flat-Passband, 6–31 GHz Tunable Magnetostatic Surface Wave Filter with Zero Static Power Consumption

    Flat passbands from 6 to 31 GHz; OneFiltr figure shows 2.2–5.0 dB loss.

    Yao, Wu, Ding, Lu, Du, Wang, Chang, Allen, Olsson

    Measured · accepted, in press
  12. IEEE Microwave & Wireless Technology Letters (accepted)Accepted

    Tilted YIG Thin-Film Magnetostatic Surface Wave Tunable Bandpass Filters with Spurious and Passband Ripple Suppression

    Tilting the YIG film to suppress spurious modes and passband ripple.

    Wu, Yao, Du, Wang, Chang, Olsson

    Measured · accepted, in press

Media

Penn Engineering reports that the 2024 study was supported by a DARPA research grant and NSF nanofabrication resources. That was academic research funding.

07 — Product & roadmap

Where OneFiltr is today.

The specifications below come from OneFiltr’s projected datasheet (draft, June 2026). They are preliminary or target values, not guaranteed performance of a mass-produced part. Contact OneFiltr for current status of evaluation units.

  1. Research resultsPeer-reviewed devices, 2024–2026
  2. Chip-level measurementsMeasured RF performance in the draft datasheet
  3. Gen 1 evaluation filterPreliminary specs · stated availability Q4 2026Current stage
  4. Tunable notch filterTarget specs · stated early 2027
  5. Production programsCustom bandwidths (20–500 MHz) referenced for production
Preliminary spec

OneFiltr Evaluation Tunable Bandpass Filter (Gen 1)

Preliminary specifications · availability stated as Q4 2026

ParameterPreliminary
Operating frequency range4–12 GHz
Extended frequency range2.5–18 GHzOn request
3 dB bandwidth100–200 MHzCustom 20–500 MHz for production programs
Filter insertion loss3–5 dBMay increase outside 4–12 GHz
Stopband rejection>40 dB
In-band IIP3>25 dBm
Out-of-band IIP3>60 dBm
Input P1dB>10 dBm4.5–12 GHz
Max in-band input (no damage)>30 dBm
Out-of-band signal handling>30 dBm
Filter static power0 mW
Control interfaceUSB, Ethernet
Operating temperature0 °C to +60 °CWith active frequency stabilization
Module volume2 cc

Available as: Passive tunable filter · Active front-end receive module with integrated LNA

Target spec

OneFiltr Tunable Notch Filter

Preliminary target specifications · stated as early 2027

ParameterTarget
Passband frequency range1–18 GHz
Passband insertion loss≤1 dB
Passband IIP3≥50 dBm
Tunable notch range3–12 GHz
Minimum notch depth≥20 dB
Maximum notch bandwidth≤1% fractional BW
Filter power consumption0 mW
Filter volume≤1 cc

View OneFiltr’s draft datasheet (Google Drive). Notes from the datasheet: the extended 2.5–18 GHz range is available on request, and insertion loss may increase outside 4–12 GHz.

08 — Team

Leadership and advisors.

Advisory board

  • Prof. Troy Olsson, PhDAdvisory Boardrolsson@onefiltr.com
  • Prof. Mark Allen, PhDAdvisory Board
  • Prof. Firooz Aflatouni, PhDAdvisory Board

09 — Contact

Tell us the band, the bandwidth and the platform.

We will point you to the right device or evaluation configuration.

Topic

Opens your email app, addressed to ageiler@onefiltr.com.