868MHz/915MHz/1GHz Notch Filter | Band-Reject Filter | High Rejection >55dB | SMA Interface

Product Description
Professional band-reject (notch) filter specifically designed to suppress 868MHz, 915MHz, and 1GHz frequency bands while maintaining low insertion loss in passbands. Features exceptional rejection (>55dB) at target frequencies, making it ideal for eliminating GSM900, CDMA800, and other interference in broadband RF systems.

Key Features

• Target Frequency Suppression:

  • ≥65dB @ 868MHz

  • ≥58dB @ 915MHz

  • ≥55dB @ 1GHz

• Low Passband Loss: ≤2.2dB (DC-650MHz), ≤2.0dB (1.2-4GHz)

• High Power Handling: 4W (36dBm) maximum input

• Compact Design: 36×12.8mm (excluding connectors)

• Standard Interface: SMA female connectors

Technical Specifications

• Center Frequency: 840MHz

• Center Frequency Rejection: ≥50dB

• 40dB Stopband: 780MHz - 1040MHz

• Passband Performance:

  • DC-650MHz: ≤2.2dB insertion loss

  • 1.2-4GHz: ≤2.0dB insertion loss

• Maximum Power: 4W (36dBm)

• Impedance: 50Ω

• Connectors: SMA female (jack)

• Dimensions: 36×12.8mm (excluding connectors)

Applications

• GSM900 interference elimination

• CDMA800 signal suppression

• Wireless system interference mitigation

• Test equipment signal conditioning

• Broadband system noise reduction

• RF front-end filtering

Frequency Response Characteristics

1. Deep Notch Region (780-1040MHz):

   • 840MHz: >50dB rejection

   • 868MHz: >65dB rejection

   • 915MHz: >58dB rejection

   • 1GHz: >55dB rejection

2. Low-Loss Passbands:

   • Lower band: DC to 650MHz (<2.2dB loss)

   • Upper band: 1.2GHz to 4GHz (<2.0dB loss)

Installation Guidelines

• Ensure proper 50Ω impedance matching

• Use quality SMA cables to minimize additional loss

• Avoid excessive bending of connector interfaces

• Do not exceed 4W input power rating

Typical Use Cases

• Removing cellular band interference from SDR receivers

• Protecting sensitive equipment from nearby transmitters

• Cleaning up broadband signals for measurement

• Isolating specific frequency bands in RF systems

Package Includes

• Notch filter module