By Hiroaki Kogure
Written for amateur engineers and engineering scholars, this easy-to-comprehend source bargains readers thorough introductory-level therapy of antenna research utilizing electromagnetic (EM) simulators. This richly-illustrated e-book indicates find out how to use EM software program to research and track instant antennas to satisfy particular specifications. Readers study vital instant antenna layout terminology and achieve a close knowing of the way antennas paintings. furthermore, the publication bargains advice in troubleshooting issues of instant antenna designs. This authoritative reference additionally offers a whole evaluation of the numerous other forms of antennas and similar EM instruments. DVD is integrated! This identify comprises Sonnet electromagnetics research software program, that includes instance documents which are defined and illustrated within the e-book.
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Extra resources for Introduction to Antenna Analysis Using EM Simulators With DVD ROM (Artech House Microwave Library)
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? 25 shows the resistance, R, of the input impedance. You can see the value of the monopole antenna is approximately half of that of the dipole. The textbook input impedance of a dipole antenna is about 73 pure real (no reactance). In contrast a monopole is 36, which is just half.
When we convert to dB, the return loss is 0 dB. Of course, no power is radiated by the antenna because all of the input power is reflected. 1 volt. 1, which is the same as 20 dB. 28 The process monitor window is displayed during simulation. The results scroll up the screen. 29 Simulation result: a plot of S11 (reflection coefficient). With a return loss of 20 dB, very little power is reflected from the antenna. That means that most of the incident power is either radiated or absorbed in antenna losses.
Perhaps the input impedance has changed? 25 shows the resistance, R, of the input impedance. You can see the value of the monopole antenna is approximately half of that of the dipole. The textbook input impedance of a dipole antenna is about 73 pure real (no reactance). In contrast a monopole is 36, which is just half. Why is this? 26 shows a monopole antenna and the equivalent dipole antenna. Both antennas have the same current. However, the voltage at the feed point is V for monopole antenna and 2V for dipole antenna.