The presence of unwanted signals or electrical energy that hurts a radio communication system is referred to as rfi interference. External, naturally occurring sources such as thunderstorms and static electricity, as well as man-made sources such as out-of-band transmissions, radiation from network antennas and cabling, and the proximity of adjacent networks operating on overlapping frequencies, are all causes of RFI interference. External radio waves or electrical activity generated unpleasant humming, static, or service interruptions in the early days of telegraph and radio transmission.  

Different Types of Interference 

Due to the various interference sources and the need for specialized interference tests and measurement equipment, distinguishing between interference types is a bit critical. rfi interference sources are classified as either intentional or unintentional RF energy radiators.

  • Intentional interference is caused by ordinary things such as portable radios, baby monitors, and cell phones, as well as poor RF designs or cell tower co-siting techniques, which reduce a receiver’s sensitivity. In this category, examples of radio frequency interference include malevolent interference signal types and tactics such as jamming or powering down cell phones during airplane takeoff and landing to protect communication systems. 
  • Unintentional interference is caused by devices that emit RF energy as a consequence of their functioning, allowing radiated energy to be “leaked” to neighboring areas. Computer monitors, ovens, and electrical motors are all potential sources of unintended interference. Laptop computers and tablets, which feature a digital timing component (oscillator), can potentially cause accidental interference. 

RF interference Test

Effective rfi radio frequency interference testing should take into consideration all deliberate and accidental interference sources, make use of the expertise of experienced RF engineers and technicians, and employ a variety of interference test procedures such as:

  • Surveys of signal intensity and quality at various places to find previously unknown interference sources. 
  • Spectrum analysis to discover sources of interference and baseline system noise in the frequency band of interest.  
  • Over-the-air frame format testing for 5G networks with the OneAdvisor 800 Wireless to validate several operators’ TDD frame formats. 
  • Interference hunting is the proactive search for, characterization of, and elimination of interference sources before they negatively affect QoE. 

Measuring the interference 

Accurate rfi radio frequency interference measurement is essential for appropriately detecting the type, source, and probable cause. Interference of any kind can alter the noise level, making it difficult for the RF network to transmit efficiently or maintain enough coverage at the network’s edge. 

  • Low-level signal measurement is critical for interference hunting and is influenced directly by spectrum analyzer parameters. Using a low noise/high gain preamplifier, lowering the resolution bandwidth (RBW) of the RBW filter, and eliminating input attenuation can all significantly improve sensitivity. Because expected and undesirable RF signals are best-analyzed side by side, the dynamic range of the RF signal analyzer, expressed in decibels (dB), is especially significant for interference-hunting applications. 
  • Wireless networks that demonstrate continuous amplitudes larger than -80 dBm inside the working band of the spectrum are most likely facing some type of RF interference. Each source of interference leaves a distinct signature, which expert RF engineers and technicians use to narrow down the most likely root cause.

What is RFI shielding?

It is a type of substance that reduces the energy of electromagnetic waves passing through it. RFI shielding is typically employed to allow electronic devices to achieve EMC, allowing them to operate legally and effectively; nevertheless, it is increasingly being utilized to protect people from the potentially harmful health effects of electromagnetic radiation. RFI shielding functions as a conductor in any application and is the best solution for rfi interference. One can consult the shielding service provider for a detailed understanding of its application.