B117NB5S Surface-Mount Bandpass Filter

Introduction

The Dielectric Laboratories / Knowles B117NB5S is a compact surface-mount bandpass filter intended for high-frequency SATCOM applications. Centered at 11.725 GHz, it helps pass a targeted portion of the RF spectrum while reducing unwanted signals outside the desired band.

Part Description

The B117NB5S is a shielded, surface-mount RF bandpass filter with a 50 Ω characteristic impedance. Its design supports operation in demanding microwave and satellite-communications systems where signal selectivity, low loss, and stable performance are important.

Built with temperature-stable materials, the filter is specified for operation from -55°C to +125°C. The shielded construction can also help reduce susceptibility to external electromagnetic interference and limit coupling with nearby circuitry. Its compact SMT format makes it suitable for dense RF assemblies and automated production processes.

Applications

Potential applications for the B117NB5S include:

• SATCOM receiver front ends
• Ku-band communications equipment
• Microwave frequency-selection circuits
• RF transceiver modules
• Downconverter and upconverter assemblies
• Signal-conditioning stages
• Antenna-feed and low-noise receiver circuits
• Test and measurement equipment operating near the filter’s intended band

Industries

Possible industries using this type of filter include:

• Satellite communications
• Aerospace and defense
• Telecommunications infrastructure
• Wireless network equipment
• RF and microwave test equipment
• Electronic instrumentation
• Scientific research
• Commercial satellite ground-station systems

Usage Ideas

1. Ku-Band SATCOM Receiver Module
   Place the filter in the receiver signal path to help reject out-of-band interference before amplification or frequency conversion.

2. Microwave Downconverter Front End
   Use the B117NB5S ahead of a mixer to select signals around 11.725 GHz and reduce unwanted mixer products.

3. High-Frequency Test Fixture
   Integrate the filter into a laboratory RF fixture for evaluating signal purity, interference rejection, or receiver performance in SATCOM-band designs.

Conclusion

The Knowles B117NB5S is a shielded surface-mount bandpass filter designed for SATCOM-band operation centered at 11.725 GHz. With 50 Ω impedance, low-loss and temperature-stable materials, and a wide operating temperature range, it is well suited to compact microwave systems that require focused frequency selection and dependable RF performance.