Radiowave Propagation and Antennas for Personal Communications

Kazimierz Siwiak (Autor)

Buch | Hardcover

400 Seiten

1995
Artech House Publishers (Verlag)
978-0-89006-755-0 (ISBN)

Infos

This text provides an introduction to antenna and propagation problems in personal telecommunications - detailing practical solutions for the design obstacles posed by fixed site antennas, radiowave propagation and small antennas proximate to the human body. The book is divided into three main parts: the first section defines the personal communications link and explores the performance of fixed site antennas in that link. The middle chapters concentrate on extensive analysis of radiowave propagation. The last section explains the nature of waves in the vicinity of personal communications devices and explores suitable antennas for small devices. The concluding chapter presents the complete personal communications systems as an application of the communications path link.

Inhalt

Part 1 Introduction: personal communications; electromagnetics fundamentals; basic antenna parameters. Part 2 Fixed site antennas: antennas as arrays of current sources; pattern multiplication and array factor; collinear antennas and vertical plane pattern control; directivity and beam width for omnidirectional antennas; array antennas; multiple beam antennas; pattern shaping of high-gain collinear antennas; proximity effects in fixed-site antennas. Part 3 The radio communication channel: guided waves; basic radiowave propagation; wave polarization. Part 4 The radio frequency spectrum: ELF and VLF - extremely low and very low frequencies; LF - low and medium frequencies; HF - high frequencies; VHF and UHF; above UHF; picking an optimum frequency. Part 5 Communications using earth orbiting satellites: satellite orbit fundamentals; the satellite radio path; polarization effects in signals from an orbiting satellite. Part 6 Radiowave propagation - radio test sites: a two-ray path propagation model; an open field test range model. Part 7 Radiowave propagation practice: theoretical models for urban propagation; empirical models for urban propagation; propagation beyond the horizon; propagation within, near, and into buildings; polarization effects. Part 8 Waves in multipath propagation: urban propagation - understanding the signal behaviour; statistical descriptions of signals; signal strength required for communications; simultaneous transmissions in radio communications. Part 9 Measuring receiver sensitivity: sensitivity of selective call receivers; relating field strength to received power; test site field strength calibration; reliability and repeatability of sensitivity measurements; effect of the human body. Part 10 Simulated human body devices: field strength sensitivities of body worn receivers; analysis of phantom human simulated body devices; the magnetic fields around simulated body devices. Part 11 Loops and dipoles: a look at quality factor, Q; primer on fundamental limitations in small antennas; antennas for personal communications; transmission line antennas; practical considerations in small antennas. Part 12 A radio communication system: noise; designing a messaging system; the coverage probability over an area; proving coverage.

Produkt-Details

• Erscheint lt. Verlag: 30.6.1995
• Reihe/Serie: Antennas & Propagation Library
• Zusatzinfo: figs.tabs.
• Verlagsort: Norwood
• Sprache: englisch
• Maße: 152 x 229 mm
• Themenwelt: Technik ► Nachrichtentechnik
• ISBN-10: 0-89006-755-4 / 0890067554
• ISBN-13: 978-0-89006-755-0 / 9780890067550
• Zustand: Neuware