Beam Efficiency webinar, July 2021 скачать в хорошем качестве

Beam Efficiency webinar, July 2021

Beam efficiency (BE) is the most important antenna parameter for unlicensed WISP networks. In fact, it does not matter if we talk about licensed or unlicensed frequency bands. If noise, interference or however you want to call it is the issue no. 1, BE is the antenna parameter to observe and make a decision factor if to use an antenna or not. Not Front to back (FtB) ratio, not Side lobe level (SLL), neither ETSI masks... Check our webinar for in-depth explanation! RF elements antennas have BE between 90 and 99%, check them out here: https://rfelements.com/products 3 min explanations - for those who don't have time to watch the full webinar: BE explanation:    • Inside Wireless: Beam Efficiency Definition   Practical BE examples:    • Inside Wireless: Beam Efficiency Examples   You may know other antenna parameters that are thought of expressing the noise suppressing capability of an antenna: 1. Front to back ratio - says how much lower the backlobe (BL) is compared to the boresight gain. Every lobe outside the main lobe is a side lobe (SL). So why should BL be more important than the rest of the SLs? In unlicensed 5 GHz networks all antenna SLs are the cause of problems with noise. More over, they change with frequency, but vast majority of WISP antenna vendors disclose FtB ratio on one frequency. This diminishes the importance of FTB ratio even more - why should one SL out of many be more important? That does not make sense.. 2. Side Lobe Level (SLL) - says what is the strength of the biggest side lobe. Again, as FTB ratio, SLL gives a very limited idea of antenna SL performance. But SLL is easy to define and historically has bee one of the easiest antenna parameters to determine which many manufacturers stuck to giving an impression of importance. As with everything though - one needs to think whether given antenna parameter is important for an application or not.. 3. ETSI masks - radiation pattern envelopes such as ETSI masks (example on page 15 here - https://bit.ly/3ip4Tmj) show what should be the maximum level of SLs antenna can have at which angle in a single cut of the radiation pattern - again an incomplete information, since these cuts are a 2D excerpt from the whole 3D radiation pattern and despite they are observed at 3 frequency points, it is not enough for wide band WISP antennas where all SLs matter. BEAM EFFICIENCY is the most complete measure of SLs. It is a ratio of the energy in the main lobe to the total energy an antenna radiates. It can have values from 0 to 100%. The best case is when BE has 100% - meaning all the energy an antenna radiates is in the main lobe. The smaller the BE is, the more SLs an antenna has. So WISPs should use antennas with BE as high as possible. In textbooks BE is defined at one frequency point and single polarization. In WISP industry it makes sense to average BE over the whole antenna bandwidth and both polarizations. This way BE as a measure of SLs becomes much more robust and reliable. BE of RF elements antennas is on average 93 % compared to 65 % of a conventional Patch Array antenna technology, so clearly, RF elements horn sectors do much better job at suppressing the noise. More details in the webinar itself, check it out! #RFelements #SymmetricalHorns #AsymmetricalHorns #Ultrahorn #Ultradish #TwistPort #SaveSpectrum #RejectNoise #growsmart #WirelessNetworks #UbiquitiNetworks #CambiumNetworks #MimosaNetworks #Mikrotik #BeamEfficiency #SectorAntennas #directionalAntennas #WISPlife #UnlicesedNetworks #RuralWISP 0:00 Intro 4:18 Myth no.1: Front to back ratio 08:36 Myth no. 2: Side lobe level 11:36 ETSI Masks 14:20 Beam Efficiency in depth 19:57 PTMP antennas BE examples 20:58 PTP antennas BE examples 22:22 BE Summary 24:12 BE in practice 26:47 Summary