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Double Band Pass Filter
 
 
    Features
 
* CE Approved, Class A RFI Shielding

* SMD, High Stability

* High Rejection

* Low Loss

* Excellent Return Loss

* Waterproof (alternative)

* Patented Housing

* Suitable for CATV and other
   communication systems
 
      Also Recommended

WF : Window Filter TBF : Triple Band Pass Filter

More ... : Filter Series
Introduction

A DBF (Double Band Pass Filter) contains two complete pass bands. Please refer to the graph below.

Double Band pass filters are used in many communication applications such as CATV or cable network reception to pass two desired bands.

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

1. High rejection, better than 50dB. (see figure)

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 copper tubes provide the best radio frequency interference (RFI) /
    electromagnetic interference (EMI) protection.

We can design other models according to your specifications.

For more filter infomation please see the filter profile technical notes in our Tech Support.
Custom filters or more details on inquires, please refer to Custom Filters.

  Items
Model 1st
Pass Band
2nd
Pass Band
1st
Reject Band
2nd
Reject Band
3rd
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 according to customer's requirements.

 

 
 

SOONTAI  TECH  CO.,  LTD.
No.43, Huangong Rd., Yongkang Dist., Tainan City 710, Taiwan
TEL: 886-6-2016969   FAX: 886-6-2013939   E-mail: soontai@soontai.com