Abstract
In the March 2002 issue of IEEE Transactions on Microwave Theory and Techniques (T-MTT), Frederick Raab, chair and founder of the highfrequency (HF), very high frequency (VHF), ultrahigh frequency (UHF) technology technical committee of the IEEE Microwave Theory and Techniques Society (Technical Committee 17), organized an extensive overview paper VHF, and UHF Systems and Technology [1]. The paper started with the early-20th-century notion that frequencies above approximately 1.5 MHz (200 m and down) were useless for communications, a fact soon discovered to be incorrect as experimenters and amateur radio enthusiasts showed the utility of the higher frequencies. The paper reviewed HF through UHF communication techniques and technologies, various propagation modes, and a number of systems and applications below 1,000 MHz. There have been many advances in this frequency range in the intervening years, some of them quite striking, as well as new applications and other applications not mentioned in the paper; updating the paper on HF, VHF, and UHF technology is the major focus of this article. In addition to updates on some of the material in the original paper, new technologies and/or a better understanding of electromagnetic (EM) behavior have occurred, and these are included in this article.
Highlights
In the March 2002 Transactions of Microwave Theory and Techniques (T-MTT), Frederick Raab, chair and founder of the HF-VHF-UHF Technology technical committee of the MTT Society (Technical Committee 17), organized an extensive overview paper titled ‘HF, VHF, and UHF Systems and Technology’[1]
Over the last twelve years, new communication technologies based on signal processing techniques and related communication protocols, have been introduced that can minimize some of the undesirable propagation effects in both the ionosphere and troposphere
A simplified analysis for capacitive coupling using the equivalent circuit shown in Fig. 18 can be performed by studying two wires positioned above a ground-plane [40]
Summary
In the March 2002 Transactions of Microwave Theory and Techniques (T-MTT) , Frederick Raab, chair and founder of the HF-VHF-UHF Technology technical committee of the MTT Society (Technical Committee 17), organized an extensive overview paper titled ‘HF, VHF, and UHF Systems and Technology’[1]. The paper reviewed HF through UHF communications techniques and technologies, various propagation modes and a number of systems and applications below 1000 MHz. There have been a number of advances in this frequency range in the intervening years, some of them quite striking, as well as new applications and other applications not mentioned in the paper; updating this article on HF, VHF and UHF technology is the major focus of this paper. The 2002 T-MTT paper covered various propagation modes over the HF through UHF frequency range where the earth’s ionosphere and troposphere can significantly impact communications. Over the last twelve years, new communication technologies based on signal processing techniques and related communication protocols, have been introduced that can minimize some of the undesirable propagation effects in both the ionosphere and troposphere. The primary focus of this paper is to update information on solidstate device technology, amplifiers of various types and power levels, magnetic resonance imaging, DC-DC power converters, EMC and ground penetrating radar
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