 Hey everybody, it's Tosses with RF Aliments and in today's episode of Inside Wireless, we're going to learn how to measure antenna gain. For more on that, check our previous videos about antenna gain here. Antenna gain is the measure of how much antenna concentrates its electromagnetic energy compared to an ideal isotropic antenna which radiates equally in all directions. Measuring antenna gain involves placing the antenna and measuring equipment in a large open space sufficient for the radiation pattern to fully develop. This is known as the far field region. The measurement can be performed outside in an area free of RF interference. Since such an area is practically non-existent apart from remote locations, the majority of measurements are done in an anechoic chamber, a specialized room designed to absorb all electromagnetic waves and mitigate reflections. The measurement equipment includes a high frequency signal generator, a signal detector or a VNA, vector network analyzer which combines the functions of both in one, and the source antenna, any antenna that can radiate the generated RF signal in the frequency range we want. Except for the antenna we want to measure, we need a reference antenna, an antenna that has its gain precisely measured at a laboratory and therefore has its gain value guaranteed. These are usually horn antennas as they are wideband and can be used for calibration at many different frequencies. They are also somewhat pricey. Once everything is in place, we are ready to set it up. We connect the source antenna to the signal generator and the reference antenna to the signal detector. We measure the signal strength in DBM that is received at the detector and store it as a reference value. We do this for all frequencies for which we want to measure the antenna gain and setup calibration is done. Then we replace the reference antenna with our antenna and measure received signal strength as before. After measurement comes processing. And is calculated by comparing these signal strengths to recorded reference values and the reference antenna data sheet. By plotting these numbers on an XY chart we get the representation of antenna gain we are all used to. And there you have it. That's the magic of how we measure antenna gain. If you liked our video, leave us a comment below and don't forget to subscribe to our channel.