Learning

RF101 - Fresnel Zones

For RF communications, a Fresnel zone, named for physicist Augustin-Jean Fresnel, is one of a (theoretically infinite) number of concentric ellipsoids in the radiation pattern of a circular aperture. Fresnel zones result from diffraction by the circular aperture. The cross section of the first (innermost) Fresnel zone is circular. Subsequent Fresnel zones are annular (doughnut-shaped) in cross section, and concentric with the first.

RF101 - Multipath and Diversity

In telecommunications when a RF signal is transmitted, it gets reflected in all directions. It takes different paths, for example, it can hit a wall, ceiling, glass, etc. Signals get reflected or refracted or absorbed by these obstacles. During this process, multiple wavefronts of the signal are creating, therefore duplicating the original signal. This is called Multipath. At the receiver end, there will be duplicates of the original signals from different reflections. This is called Multipath Fading or Multipath distortion.

RF101 - The Antenna Path - More than the Antenna

The point where the rubber meets the road in wireless networks is the antenna. The only thing is the before we hit the antenna, we have the entire antenna path which consists of various opportunities for error and issues. From external interference, to Passive Intermod (PIM), to actual faults in the path. Once the issue has been identified in the antenna path itself and not the external RF environment, there is the potential for a large variety of antenna path component combinations including fiber, coax cables, duplexers, diplexers, connectors, antennas, RETs, TMA.

RF101 - Antennas - Back to Basics

With the rollout of fiber-fed antennas, RETs, and DAS systems seemingly making RF systems more complex, one simple item remains. RF is transmitted out of an antenna. It may be a large antenna with 18 sectors built into it or a small 100cm square antenna, but each antenna holds to the physics of antenna design. Understanding the basic antenna principles allows engineers to have that ingrained sanity check for system design and optimization.

About RFAssurance

RFAssurance is a Telecom Technology Services, Inc department specializing in the support of wireless networks. RFAssurance provides support and consulting for RF RAN and Core Network tools, processes, and results to improve network design, optimization, and general performance. Our managers, engineers and software developers are subject matter experts with various design & optimization tools, database structure, web implementation, and their practical applications. For how we can help support your network, contact us via email at rfassurance@ttswireless.com