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Several passive RF band-reject filters are specified for operation at or near 100 W, but “100 W” alone is not enough to select one. Match the filter’s notch and passbands to your frequency plan, then verify how its power rating is defined: the examples here include 100 W continuous-wave, 100 W average, and 100 W maximum input at a stated insertion loss. Those ratings are not interchangeable.
What a 100 W band-reject rating tells you—and what it does not
A band-reject filter, also called a band-stop or notch filter, attenuates a specified frequency range while passing signals outside it. A 100 W rating is meaningful only alongside the filter’s frequency response, impedance, operating conditions, and rating definition. It does not establish that the filter will suit every 100 W transmitter or test setup.
| # | Preview | Product | Price | |
|---|---|---|---|---|
| 1 |
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Broadcast AM Reject High Pass Filter (2.6 MHz HPF) by RTL-SDR Blog | $17.95 | Buy on Amazon |
| 2 |
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XusLFR Bandpass Filter Coaxial Bandpass Filter Bandpass Filter 890-915MHz GSM900 25MHz | $17.89 | Buy on Amazon |
For example, a filter might be rated for 100 W continuous-wave (CW), 100 W average, or 100 W maximum input under a stated insertion-loss condition. The waveform, duty cycle, crest factor, and thermal installation affect whether a rating matches a real application. Check the manufacturer’s full specification before connecting the filter to a transmitter.
Examples of filters specified for up to 100 W
These models illustrate how much the frequency range and other specifications vary. They are product-specific examples, not interchangeable alternatives; confirm current availability and specifications with the manufacturer or an authorized distributor.
#1 Best Overall
- RTL-SDR Blog Broadcast AM Reject Filter
- Blocks the broadcast AM band between 500 kHz - 1.7 MHz with over 50 dB of attenuation
- The 3 dB roll-off point is between 2.5 - 2.6 MHz
- Note: For RX use only
- Uses SMA Female connectors.
| Model | Notch and passbands | Rejection and passband loss | Power rating | Other published details |
|---|---|---|---|---|
| Quantic PMI BR6000-100-CD-SS | Notch: 5.95–6.05 GHz. Passbands: DC–5.85 GHz and 6.2–6.8 GHz. | −30 dB within ±0.09 GHz; −65 dB in listed out-of-band ranges. Passband insertion loss: 1 dB typical. | 100 W CW. | Passband VSWR 1.5:1; SMA female input and output; 2.90 × 0.65 × 0.75 in housing. Manufacturer-published specifications: Quantic PMI. |
| 3H Communications Systems CCN101-646 (B7 receive band) | Notch: 2500–2570 MHz. Passbands: DC–2475 MHz and 2595–5000 MHz. | 110 dB notch rejection. Insertion loss: 1.5 dB maximum in broad passband sections, rising to 2.0 dB maximum near notch edges. | 100 W average. | 50 Ω; N-type female input and output; return loss 12 dB typical, 9 dB minimum; maximum outline 205 × 106 × 40 mm and mass 3 kg. Operating range 10 to +40 °C; non-operating −55 to +125 °C; IP63 when mated. Datasheet revision dated 2021-07-27: 3H Communications Systems. |
| Lorch Microwave 18BRX-1350/X700-NM/N | Rejects 1200–1570 MHz; listed pass ranges include 20–1000 MHz and 1800–2500 MHz. | 70 dB rejection across 1200–1570 MHz. Insertion loss: 1.2 dB from 20–1000 MHz and 1.5 dB from 1800–2500 MHz. | 100 W power handling; the cited listing does not further define the rating as CW or average. | VSWR 1.5:1; 2.5 × 1 × 1 in package; operating range −40 to +65 °C. Product listing in Microwave Journal (2009). |
| Procom/Amphenol BPBR 4/66-HX-150 | 68–108 MHz band-pass/band-reject filter for two-way-radio/VHF applications. | At least 60 dB rejection at 800 kHz spacing and at least 55 dB across the rest of 87.5–108 MHz. The catalog specifies 1 dB insertion loss in connection with its power rating. | 100 W CW maximum input at 1 dB insertion loss. | 50 Ω; N-female connectors. Catalog entry: Procom/Amphenol. |
Specifications above come from the cited product materials: Quantic PMI, 3H Communications Systems, Microwave Journal, and Procom/Amphenol. The 3H datasheet’s revision history records an initial release on 2021-06-18 and a final revision dated 2021-07-27; the Lorch listing dates to 2009, so confirm specifications directly before relying on it.
How to choose a 100 W RF band-reject filter
- Map wanted and unwanted frequencies. Confirm that the interference or signal to suppress falls inside the specified notch, and that every signal you need falls inside a passband. Check the exact band edges rather than relying on a model name or a broad frequency label.
- Choose sufficient notch width and rejection. A narrow notch can miss interference near its edge. Compare the specified rejection across the frequencies you need to suppress; the deepest headline rejection may apply only to a particular range.
- Match the power rating to the signal. Determine whether the rating is CW, average, or maximum input under a stated insertion loss. Compare it with your waveform, duty cycle, crest factor, and installation’s ability to dissipate heat. Do not treat these rating types as equivalent.
- Check insertion loss and matching. Insertion loss reduces the wanted signal reaching the load; VSWR or return loss indicates how well the filter is matched to the system. These matter in transmitter paths as well as receive paths, where loss can reduce signal margin.
- Verify connectors, impedance, and installation limits. Confirm the system impedance—commonly 50 Ω in these examples—connector type and gender, dimensions, temperature limits, and any environmental rating. Adapters can add loss or mismatch, so account for them if the filter does not connect directly.
- Get confirmation for the actual setup. Before purchase or installation, ask the manufacturer or authorized distributor to confirm the current datasheet and suitability for the intended frequency plan, power level, waveform, and cooling conditions.
Why “100 W” is not a complete part specification
The four examples span VHF, 1.2–1.57 GHz, 2.5 GHz, and 6 GHz use cases, with different notches, passbands, connectors, package sizes, and rejection figures. A filter that handles the power but places the notch over a wanted signal—or fails to cover the unwanted one—is the wrong filter. Start with the frequency plan, then use the power, loss, matching, and mechanical specifications to narrow the selection.
Quick Recap
Rank #2
- has a 1dB bandwidth of 25MHz and a cut-off characteristic. Used for GSM900 test in 890 - 915 MHz frequency , it can effectively filter out out-of-band , reduce noise and increase dynamic .
- Model: FBP-902s, Impedance: 50 Ohms.
- Central frequency: 902 MHz, Passband (1dB bandwidth): 890-915 MHz.
- Interpolation loss: 2.0-2.5 (typical value: 2.2 ).
- load capacity: 100 mW (20 ), : SMA-M, SMA-F.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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