Section 2 Microwave Path Engineering Basics TRACER 6000 Series Split System Manual18 Copyright © 2005 ADTRAN, Inc. 612806320L1-1BFigure 1 illustrates a wireless link configuration containing all the parameters necessary for the powerbudget analysis.Figure 1. Example Microwave Path with ParametersThe following sections further discuss the power budget analysis and its components.Antenna GainActual transmit and receive antenna gain values depend strictly upon the physical characteristics of theantennas installed for each link. In other words, the size of the dish determines the antenna gain. Using aparabolic dish antenna results in the best performance. Antenna gains are specified in terms of decibels ofgain referenced to an isotropic source (dBi). An isotropic source is a hypothetical antenna having equalradiation in all directions. Typical antenna gains are listed in Table 1 (standard) and Table 2 on page 19(metric); however, dish manufacturers can provide gains for specific types of antennas.Table 1. Antenna Gain for Given Dish Diameters (Standard)Dish Diameter(in feet)Gain at 5.8 GHz(in dBi)2 28.54 34.26 37.58 40.710 42.512 44.2G T G Rd, LPP T P RλLL
