It increases efficiency by helping the engineer to make a more informed choice of antenna element, providing a good starting design tuned to the specifications of the application. CST STUDIO SUITE is suitable for designing a wide range of antenna types, including horns, reflectors, wire antennas, printed antennas and arrays.Īntenna Magus is a software tool to help accelerate the antenna design and modelling process. These can be used to simulate antenna radiation patterns, installed performance and coupling in realistic environments. It also provides, given a beamwidth, the inner and outer radii of beam's coverage.ĬST Studio Suite® is an industry-leading EM simulation tool, with multiple solvers for suitable for a wide range of applications. The Antenna Downtilt and Coverage Calculator (aka Antenna Tilt Angle Calculator) is used to determine the approximate downward angle, measured in degrees, which the transmitting antenna is to be positioned for optimal signal strength and coverage. The element values are stored in the variable L_Optimized.Antenna Downtilt and Coverage Calculator Pasternack The optimization variables are the first and last inductors, L1 and L5 respectively. ![]() There are several ways to choose the cost function and some options are shown within the objective function above (in comments). % Other possible choices for objective function could be :. % Calculate input reflection coefficient 'gammaIn' % Perform analysis on tuned matching network MatchingNW.Inductances(end) = Lvalues(end) % Update the element values in the matching network % Copyright 2008-2020 The MathWorks, Inc. % Designing Broadband Matching Networks (Part I: Antenna) % ANTENNAMATCHOBJECTIVEFUN is an objective function of RF Toolbox demo: % The inductor values are stored in the variable LVALUES. % evaluated after updating the inductor values in the object, MATCHINGNW. % returns the current value of the objective function stored in OUTPUT % OUTPUT = ANTENNAMATCHOBJECTIVEFUN(MATCHINGNW,LVALUES,FREQ,Z0) % Designing Broadband Matching Networks for Antennas. %ANTENNAMATCHOBJECTIVEFUN is the objective function used by the example The objective function used during the optimization process by fminsearch is shown here.įunction output = antennaMatchObjectiveFun(matchingNW,Lvalues,freq,ZL,Z0) Number of iterations/function evaluations - Set the maximum number of iterations and function evaluations to perform, so as to tradeoff between speed and quality of match. Optimization method - A direct search based technique, the MATLAB® function fminsearch, is used in this example to perform the optimization. Optimization variables - In this case it is a vector of values, for the specific elements to optimize in the matching network. In this example we have chosen to minimize the average reflection coefficient in the passband. One obvious choice is the input reflection coefficient, gammaIn. There could be several ways to choose the cost function. ![]() For this example, the objective function is shown in the file below.Ĭhoice of cost function - The cost function is the function we would like to minimize (maximize) to achieve near optimal performance. Objective function - The objective function can be built in different ways depending on the problem at hand.
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