ANTENNA AND EM MODELING WITH MATLAB ANTENNA TOOLBOX™
An essential text to MATLAB Antenna Toolbox™ as accessible and easy-to-use full-wave antenna modeling tool
Antenna and EM Modeling with MATLAB Antenna Toolbox™ is a textbook on antennas intended for a one semester course. The core philosophy is to introduce the key antenna concepts and follow them up with full-wave modeling and optimization in the MATLAB Antenna Toolbox™. Such an approach will enable immediate testing of theoretical concepts by experimenting in software. It also provides the direct path to research work.
The fundamental families of antennas — dipoles, loops, patches, and traveling wave antennas — are discussed in detail, together with the respective antenna arrays. Using antenna parameters such as impedance, reflection coefficient, efficiency, directivity, and gain, the reader is introduced to the different ways of understanding the performance of an antenna.
Written for senior undergraduates, graduates as well as RF/Antenna engineers, Antenna and EM Modeling with Antenna Toolbox™ is a resource that:
Provides 14 video assisted laboratories on using Antenna Toolbox™
Includes approximately 50 real-world examples in antenna and array design
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Yes, you can access Antenna and EM Modeling with MATLAB Antenna Toolbox by Sergey N. Makarov,Vishwanath Iyer,Shashank Kulkarni,Steven R. Best in PDF and/or ePUB format, as well as other popular books in Technology & Engineering & Electrical Engineering & Telecommunications. We have over one million books available in our catalogue for you to explore.
SECTION 1 LUMPED CIRCUIT MODEL OF AN ANTENNA. ANTENNA INPUT IMPEDANCE
1.1 Antenna Circuit Model. Antenna Loss
1.2 Maximum Power Transfer to (and from) Antenna
1.3 Antenna Efficiency
1.4 Antenna Input Impedance and Impedance Matching
1.5 Point of Interest: Input Impedance of a Dipole Antenna and Its Dependence on Dipole Length
1.6 Beyond the First Resonance
1.7 Numerical Modeling
References
Problems
1.1 ANTENNA CIRCUIT MODEL. ANTENNA LOSS
The generic transmitter (TX) circuit with an antenna is shown in Figure 1.1. The generator (g) is modeled as an ideal (sinusoidal or pulse) voltage source Vg in series with the generator resistance Rg, connected to a TX antenna. The typical generator resistance is 50 Ω. This model is known as Thévenin equivalent of the generator circuit. The Norton equivalent may also be used when necessary.
Figure 1.1 A generator (its Thévenin equivalent) connected to an antenna.
The portion depicted in the shaded box is an antenna. The antenna in Figure 1.1 is assumed to be resonant, which means that its equivalent impedance, Za, is purely real, i.e.
(1.1)
In order words, the resonant antenna is simply modeled by a resistor Ra.
The antenna resistance Ra includes two parts:
Radiation resistance of the antenna Rr that describes the circuit power loss due to radiation by the antenna into free space.
Loss resistance of the antenna RL that describes the circuit power loss in the antenna itself. Case in point: a long thin wire with a significant ohmic resistance or a helical antenna with a ferrite lossy core.
One thus has
(1.2)
Parasitic antenna resistance RL has the following features:
it is zero for ideal antennas (a metal antenna made of perfect electric conductors);
it is usually relatively small for metal antennas covering the band 0.3–3 GHz (UHF, L‐band, S‐band) where it may be often ignored;
it may be very significant for printed antennas on lossy dielectric substrates and in the vicinity of lossy dielectric (such as FR4, ABS, human body, etc.);
it is vital for very small antennas whose size is much less than the wavelength.
Example 1.1
A small antenna operating at f = 10 MHz uses a thin copper wire with the diameter D of 0.25 mm and with the wire length l of 1 m. Calculate antenna loss resistance RL.
Solution: The DC resistance of the wire is given by
