Title :
HF, VHF, and UHF systems and technology
Author :
Raab, Frederick H. ; Caverly, Robert ; Campbell, Richard ; Eron, Murat ; Hecht, James B. ; Mediano, Arturo ; Myer, Daniel P. ; Walker, John L B
Author_Institution :
Green Mountain Radio Res., Colchester, VT, USA
fDate :
3/1/2002 12:00:00 AM
Abstract :
A wide variety of unique systems and components inhabits the HF, VHF, and UHF bands. Many communication systems (ionospheric, meteor-burst, and troposcatter) provide beyond-line-of-sight coverage and operate independently of external infrastructure. Broadcasting and over-the-horizon radar also operate in these bands. Magnetic-resonance imaging uses HF/VHF signals to see the interior of a human body, and RF heating is used in a variety of medical and industrial applications. Receivers typically employ a mix of analog and digital-signal-processing techniques. Systems for these frequencies make use of RF-power MOSFETs, p-i-n diodes, and ferrite-loaded transmission-line transformers
Keywords :
MOSFET; UHF devices; VHF devices; ionospheric electromagnetic wave propagation; magnetic resonance imaging; meteor burst communication; p-i-n diodes; radiofrequency heating; signal processing; tropospheric electromagnetic wave propagation; HF systems; MOSFETs; RF heating; UHF Systems; VHF systems; beyond-line-of-sight coverage; communication systems; ferrite-loaded transmission-line transformers; industrial applications; ionospheric systems; magnetic-resonance imaging; medical applications; meteor-burst systems; p-i-n diodes; signal-processing techniques; troposcatter systems; Biomedical imaging; Electrical equipment industry; Hafnium; Heating; Humans; MOSFETs; P-i-n diodes; RF signals; Radar imaging; Radio frequency;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
