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    Certificate TW12/11128



Double Band Pass Filter


* Class A RFI Shielding

* Support DOCSIS 3.1

* Low Loss

* High Rejection

* Excellent Return Loss

* Flat Passband

* High Stability

* Excellent Mechanical Structure

* Precision Connector Thread

* Exquisite Plating Quality

* Good Weather Resistance

* Waterproof (alternative)

* Patented Housing
Double Band Pass Filter

The double band pass filter contains two complete pass bands. Please refer to the graph below.

A common application is to pass two bands of the forward path signals/ channels.

The circuit architecture of this double band pass filter was invented by Soontai.

We can design filters with more than 3 passbands, and even more. Please refer to our triple band pass filters.

Soontai's double band pass filters provide many features (see below).

1. Wide and deep reject band, provides excellent rejection capabilities to clear undesired signal,
    rejection better than 50dB.

2. Lowest insertion loss, signal-through-loss reduced to a minimum.

3. Excellent return loss, good impedance match reduces signal loss to keep the signal clean. (see figure)

4. Dual layer brass tubes provide the best radio frequency interference (RFI) / electromagnetic interference (EMI) protection.

We can design other models according to your specifications.

For more filter products, please see our filter category.

To learn more filter types please see the filter profile technical notes in our Tech Support.

Custom filters or more details on inquires, please refer to Custom Filters.

Model 1st
Pass Band
Pass Band
Reject Band
Reject Band
Reject Band
DBF-20-42/210-258 20-42 MHz 210-258 MHz 5-10 MHz 55-185 MHz 294-1000 MHz
DBF-85-225/382-600 85-225 MHz 382-600 MHz 5-75 MHz 249-355 MHz 640-1000 MHz
DBF-88-108/470-550 88-108 MHz 470-550 MHz 5-75 MHz 126-430 MHz 610-1000 MHz
DBF-114-120/450-470 114-120 MHz 450-470 MHz 5-100 MHz 136-405 MHz 520-1000 MHz
  Electrical Curve ( DBF-85-225/382-600 )

Insertion Loss  |  Return Loss
SPAN 1000MHz
Fig 1

Insertion Loss  |  Return Loss
SPAN 1000MHz
Fig 2
  General Specifications
  Item DBF - 85-225 / 382-600
  Impedance 75 ohm
  Frequency Range 5 - 1000MHz
  1st Pass Band 85 - 225 MHz
  2nd Pass Band 382 - 600 MHz
  1st Reject Band 5 - 75 MHz
  2nd Reject Band 249 - 355 MHz
  3rd Reject Band 640 - 1000 MHz
  1st Pass Band Insertion Loss 1.8dB (typ)  /  2.5dB (max)
  2nd Pass Band Insertion Loss 2.8dB (typ)  /  3.5dB (max)
  Pass Band Return Loss 20dB (typ)  /  14dB (min)
  Reject Band Rejection 50dB (min)
  Dimensions (incl. M/F connectors) 21(¢) x 91(L) mm
  Net Weight 72g
 * Specifications may be change depending on the model or customer's requirement.


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