Introduction to Antenna Analysis Using EM Simulators With by Hiroaki Kogure

By Hiroaki Kogure

Written for beginner engineers and engineering scholars, this easy-to-comprehend source deals readers thorough introductory-level remedy of antenna research utilizing electromagnetic (EM) simulators. This richly-illustrated ebook indicates easy methods to use EM software program to investigate and track instant antennas to satisfy particular specifications. Readers examine very important instant antenna layout terminology and achieve a close realizing of ways antennas paintings. additionally, the publication bargains tips in troubleshooting issues of instant antenna designs. This authoritative reference additionally offers an entire assessment of the various other forms of antennas and comparable EM instruments. DVD is integrated! This name comprises Sonnet electromagnetics research software program, that includes instance records which are defined and illustrated within the publication.

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Extra info for Introduction to Antenna Analysis Using EM Simulators With DVD ROM (Artech House Microwave Library)

Example text

Resonance had only been seen in mechanical systems before. In a mechanical system, resonance happens when energy oscillates between two different forms. Imagine a pendulum. When the pendulum has swung out as far as it is going to go, it is momentarily stationary. Potential energy is maximum. As the pendulum swings past its central position one-quarter of a cycle later, its velocity, and thus kinetic energy, is maximum. 10 (a–c) Electric field (electric lines of force) around the capacitors. 11 Representation of Hertz’s 1888 experiment.

This is due to the large patches on the end of the dipole. This technique of lowering the resonant frequency of a dipole antenna is called capacitive end loading. Why did Hertz use spheres connected by rods and wires for his antennas? 8 shows a Leiden jar used in the 18th century at Leiden University in the Netherlands. Tin foil coats the inside and outside of the glass bottles. A chain drops down from a metallic ball near the top and touches the foil on the inside of each bottle at the bottom, forming one terminal of a capacitor.

Previously, port 1 excited a voltage between the two halves of the dipole. Now, that same port is exciting a voltage between the half dipole and the ground plane. An antenna like this is called a monopole. 24 is a plot of S11 showing results of both the monopole and the dipole. Even though the antennas are different, the resonant frequencies are almost the same. However, the plots are different. The monopole has higher reflection, more power is reflected and less is radiated. Perhaps the input impedance has changed?

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