5G Brings New Opportunities and New Challenges

Filtering the NR frequencies does not have to be a mystery

This page is a collection of resources to help navigate some of the issues and options when considering filtering for a 5G system.


For Mobile Users:

Enhanced Mobile Broadband (eMBB)

eMBB will enable increased mobile capabilities, with three distinct attributes:

  • Higher capacity – Increased broadband access in densely populated areas
  • Enhanced connectivity – Increased broadband access everywhere
  • Higher user mobility – Broadband access in moving vehicles including cars, buses, trains and plane

For Fixed Broadband Users:

Fixed Wireless Access.

Distinct from the advantages 5G brings to mobile, Fixed Wireless Access (FWA) is a way to provide high performance broadband access to homes and offices through wireless. This aspect of 5G leverages millimeter wave (mmWave) frequencies.


For connected devices, equipment and infrastructure components:

Internet of Things.

The increased capacity and reduced latency that 5G brings will further fuel the growth of IoT (Internet of Things) applications.



From 1GHz to 6GHz we encounter the familiar LTE bands. This region is being looked at for use cases that need of the order of 100MHz of bandwidth, with the 2.5GHz Band 41 and 3.5GHz (42+43) regarded as candidates for 5G enhanced Mobile Broadband (eMBB) applications

Frequencies below 1GHz in the UHF perform well in applications that require long range and high data rates – these are the frequencies we are used to seeing in Macro base station applications. Moving forward to 5G they will be leveraged for lower data rate and narrow band applications (such as already used in 4G IoT applications) and are looked at for the ‘massive Machine to Machine Type Communications’ (mMTC).

Starting at 28GHz we find the cm-wave and mmWave frequencies that are being utilized in Fixed Wireless Access (FWA) applications. It is these frequencies that are being deployed first.

You can learn more about the 5G Frequency Spectrum and some of the aspects of mmWave in our Blog Post An Introduction to the 5G Frequency Spectrum

The millimeter-wave part of the electromagnetic spectrum is at the high end of the microwave region (which spans ~300 MHz to 300 GHz) and is usually taken to mean frequencies from ~30 GHz to 300 GHz and wavelengths in the range of 1mm to 1cm. The ITU designation for the band spanning 30 GHz to 300 GHz is EHF (Extremely High Frequency).

One of the characteristics that makes this part of the spectrum so interesting to communication applications is that the frequencies are that much higher than those historically used in wireless so the available spectrum in the mmWave potentially opens up 200x the spectrum available below 3 GHz.

From a dramatic increase in available bandwidth comes an increase in achievable data-rates, making these frequencies extremely interesting to teams around the world working on 5G communications. However, with this increase in frequency comes a set of challenges.

Knowles Precision Devices (DLI) Filter Technology is a proven approach to addressing the challenge of implementing high performance filters at mmWave frequencies for 5G applications.

5G mmWave Filter Products

We provide:

  • 5G Band Offerings
  • Surface Mount Assembly up to 42 GHz 
  • Extremely High Repeatability through Precision Thin Film Fabrication
  • Temperature Stable over -55 to +125°C

You can learn more about Knowles Precision Devices Filter Technology through our brochure and Microwave Products page and through the resources listed below

Type Title
Blog Post An Introduction to the 5G Frequency Spectrum
Blog Post FAQ: What Frequencies Do Your Microwave Products Cover?
Blog Post Filter Shape Factor and Selectivity
Blog Post Microstrip Filters Deliver Small Size at High Frequencies
Blog Post Simplifying 5G Radio Design with a New Range of 28 GHz Bandpass Filters
Blog Post From the 1920s to the 2020s – Bandwidth Has Always Been King
Blog Post Milli-Cap: The Ideal Ultra-Low Loss Broadband Blocking Capacitor
Blog Post 5 Ways to Address Common RF Filtering Challenges in mmWave Applications
Blog Post Microwave Journal Releases mmWave RF Components Guide eBook
White Paper Experimenting with Open-Source RF Analysis Tools
White Paper RF Filtering For 5G Millimeter Wave Applications
White Paper Implementing High Performance Filters in Millimeter Wave Applications
White Paper Microstrip Filter Topologies
White Paper Reduce Cost and Complexity in 5G mmWave systems with Surface Mount Solderable  Filter Components
White Paper Tolerance and Size Analysis for mmWave Filter Manufacturing
White Paper Reduce SWaP, Increase Performance of Phased Arrays with an Innovative Filtering  Approach
Article Approaching the 5G mmWave Filter Challenge
Article Addressing Size and Tolerance Challenges in mmWave Filters
Webinar Practicalities of Building a 28 GHz Small Cell
5G Filtering Solutions