Electronic Systems Technology ESTEEM195EA Wireless LAN transceiver User Manual CHAPTER 2
Electronic Systems Technology Wireless LAN transceiver CHAPTER 2
Contents
- 1. User Manual
- 2. User Manual Appendix A
- 3. User Manual Appendix B
- 4. Antenna Setup
Antenna Setup









![CHAPTER 8 ANTENNA SETUPS Revised: 27 Jan 12 8-10 EST P/N AA107A FRESNEL ZONE The Fresnel zone shows the ellipsoid spread of the radio waves around the visual line-of-sight after they leave the antenna (see figure above). This area must be clear of obstructions or the signal strength will be reduced due to signal blockage. Typically, 20% Fresnel Zone blockage introduces little signal loss to the link. Beyond 40% blockage, signal loss will become significant. This calculation is based on a flat earth. It does not take into account the curvature of the earth. It is recommended for RF path links greater than 7 miles to have a microwave path analysis done that takes the curvature of the earth and the topography of the terrain into account. Fresnel Zone Radius = 72.1 SQRT [(d1d2) / (F(d1 + d2)] Units Fresnel Zone Radius in feet. d1 and d2 in statue miles F in GHz](https://usermanual.wiki/Electronic-Systems-Technology/ESTEEM195EA.Antenna-Setup/User-Guide-1635891-Page-10.png)