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EEL 5462 - Antenna Theory - Fall 2013, GM Due: Dec 3rd 2013, 9.30am CAD Assignment #4 Note: Show all work in detail. Write neatly and in an organized...

Help on antenna theory using ADS software, document attached.

EEL 5462 – Antenna Theory – Fall 2013, GM Due: Dec 3 rd 2013, 9.30am CAD Assignment #4 Note: Show all work in detail. Write neatly and in an organized manner – if grading the problem requires “putting puzzle pieces” together your score will be low. Introduction: This assignment will show you how to simulate patch antennas using ADS. The dimensions of the first patch antenna are specified below. You will investigate effects of the substrate’s permittivity on the antenna performance and report your observations. Patch Antenna: The dimensions of the initial patch design and the corresponding substrate parameters are listed in Table 1. The thickness of the substrate is 1.55 mm and its bottom surface is covered with perfect electric conductor to form the ground plane. The width microstrip feed line must be adjusted to have 50Ω characteristic impedance. You can determine this width using LineCalc tool of ADS. Table I. Design Parameters Simulate the antenna from 1GHz to 3GHz and report the following information: 1. Resonant frequency. 2. Electrical length of the patch. Note that this will be in terms of guided wavelength . You can determine guided wavelength by evaluating the effective “relative” permittivity and using the following formula: lambda_eff = speed of light/frequency/sqrt(relative permittivity). See also the related equations and discussions in Balanis. 3. -10 dB return loss bandwidth. 4. Peak gain value 5. 3D Radiation pattern. Which direction does the patch radiate? 1 | P a g e
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EEL 5462 – Antenna Theory – Fall 2013, GM Due: Dec 3 rd 2013, 9.30am Performance Study with Different Permittivity Values: Change the substrate thickness to 1mm. Keep the antenna size (i.e. Wp and Lp) and permittivity of the substrate identical to the previous case. Since substrate height has changed, you now need to determine a new width for the microstrip feed line to have 50Ω characteristic impedance (you can again use LineCalc for this). In addition, new values for Wf, Li must be chosen via trial and error to get good impedance match between the antenna and the feed line. Having completed the design, report the following: 1. Resonant frequency (simulate from 1GHz to 3GHz as was done previously). If you see multiple resonances, we are interested in the first one (lowest order mode). 2. -10 dB return loss bandwidth 3. Peak gain and 3D radiation pattern. Now repeat the above steps for the following permittivity values of 6 and 10. Report the following plots: 4. x-axis is for the dielectric constant and y-axis is for the peak gain. 5. x-axis is substrate dielectric constant and y-axis is -10 dB return loss bandwidth 6. x-axis is substrate dielectric constant and y-axis is resonant frequency Discuss the effects of the substrate permittivity on the antenna performance by interpreting the above results. Also, relate the above results to what is being expected from theory (Balanis, see discussions in the microstrip antennas chapter). 2 | P a g e
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EEL 5462 – Antenna Theory (for Professionals) 1 Tutorial for Modeling Printed Antennas in ADS Momentum: Strip Dipole Antenna Example This tutorial demonstrates how to model a printed antenna in Agilent Advanced Design System (ADS) 2012 by going through an example strip dipole antenna example. The Momentum suite of ADS will be used to generate a full-wave electromagnetic model of the antenna. Momentum suite is based on method of moment (MoM) solution of electric/magnetic field integral equations. The antenna is modeled layer-by-layer over stacked planar dielectric/magnetic substrate materials. The number of material layers, type of layer metallization, and material properties (permittivity and permeability) can be defined by the users. Momentum assumes that the substrate materials are infinitely large in the plane and exhibit a finite thickness. Therefore, it cannot model finite size substrate and ground plane effects. Due to this infinitely planar substrate and ground plane assumption, these type of commercial software suites are sometimes referred to as 2.5D solvers. The following presents the design steps of modeling a strip dipole antenna in ADS 2012 Momentum Suite. 1) Start the ADS 2012 software. 2) Create a new workspace and choose the directory where you want to save it. 3) Click “Next” three times. Select the units you would like to use (Standard ADS layers, 0.0001 millimeter layout resolution). Click “Next” one more time, and then finish. 4) Go to options, technology, and technology setup.
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EEL 5462 – Antenna Theory (for Professionals) 2 5) Select millimeters from the bullet menu to set your layout units to millimeters if it is not already selected that way during the program initialization. 6) Hit OK and a pop up window will appear asking if you want to save it. Save it. 7) Open a Schematic Window as shown in below snapshot.
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