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Band Reject Filter
 
 
    Features
 
* CE Approved, Class A RFI Shielding

* Short (21x57mm)

* High Rejection

* Low Loss

* Excellent Return Loss

* Waterproof (alternative)

* Patented Housing

* Suitable for CATV, MoCA, G.hn,
  Cablenet and other communication
  systems
Introduction

Band Reject Filters or called Band Stop Filter is designed to pass the CATV Return Path (e.g. 5-42MHz, 5-65MHz, etc.) and UHF Band signals and reject all other CATV channels (e.g. 55-500MHz, 85-450MHz, etc.).
This means the Reject Band can have a width of 100MHz, 500MHz or more.

Soontai's band reject filters have many features (see below).

1. Sharp and deep reject band, provides excellent rejection capabilities to
    clear undesired signal.

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.

The table below shows popular BRF series filter models.
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 Reject Band 1st Pass Band 2nd Pass Band
BRF-55-500 55 - 500 MHz 5 - 42 MHz 550 - 1000 MHz
BRF-55-550 55 - 550 MHz 5 - 42 MHz 600 - 1000 MHz
BRF-70-500 70 - 500 MHz 5 - 55 MHz 550 - 1000 MHz
BRF-85-350 85 - 350 MHz 5 - 65 MHz 400 - 1000 MHz
BRF-85-620 85 - 620 MHz 5 - 65 MHz 659 - 1000 MHz
BRF-222-526 222 - 526 MHz 5 - 215 MHz 552 - 1000 MHz
BRF-245-356 245 - 356 MHz 5 - 230 MHz 380 - 1000 MHz
BRF-330-522 330 - 522 MHz 5 - 300 MHz 552 - 1000 MHz
  Electrical Curve ( BRF-55-550 )

Insertion loss  |  Return Loss
SPAN 1000MHz
Fig 1

Insertion Loss  |  Return Loss
Close Up 5 - 42MHz
Fig 2
  General Specifications
  Item BRF-55-550
  Impedance 75 ohm
  Frequency Range 5 - 1000MHz
  Insertion Loss ( 5 - 42MHz ) 0.5dB (typ) / 2.0dB (max)
  Insertion Loss ( 600 - 1000MHz ) 0.6dB (typ) / 2.5dB (max)
  Return Loss 20dB (typ) / 14dB (min)
  Rejection ( 55 - 550MHz ) 50dB (min)
  Dimensions (incl. M/F connectors) 21(¢) x 57(L) mm
  Net Weight 48g
 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