World Library  
Flag as Inappropriate
Email this Article

Multi-band device

Article Id: WHEBN0026274846
Reproduction Date:

Title: Multi-band device  
Author: World Heritage Encyclopedia
Language: English
Subject: HTC Dream, Orange Rio, HTC Merge, Amazon Fire TV, Mobile music
Collection: Gsm Standard, Mobile Technology
Publisher: World Heritage Encyclopedia

Multi-band device

Motorola Timeport, the first tri-band mobile phone (1999)

In telecommunications, a multi-band device (including dual-band, tri-band, quad-band and penta-band devices) is a communication device (especially a mobile phone) that supports multiple radio frequency bands. All devices which have more than one channel use multiple frequencies; a band however is a group of frequencies containing many channels. Multiple bands in mobile devices support roaming between different regions where different standards are used for mobile telephone services. Where the bands are widely separated in frequency, parallel transmit and receive signal path circuits must be provided, which increases the cost, complexity and power demand of multi-band devices.

The term quad-band describes a device that supports four frequency bands: 850 and 1900 MHz, mostly used in the Americas (ITU region 2), and the 900 and 1800 MHz bands used elsewhere. Most GSM/UMTS phones support all four bands, while most CDMA/1xRTT phones do not, and so are considered only dual-band devices. A few phones support both of the domestic frequencies but only one foreign one for limited roaming, making them tri-band phones.

The term penta-band describes a device that supports a fifth frequency band, commonly the 2100 MHz band in much of the world. The Advanced Wireless Services (AWS) 1700 MHz band also seeing increased usage.

4G LTE bands

In the United States only, the two largest carriers are instead implementing 4G LTE in the 700 MHz band, which was reallocated from TV broadcasting during the DTV transition. TV stations were forced to move to lower UHF and even much worse VHF frequencies with poorer mobile TV and even regular terrestrial TV performance, because the 700 MHz band has better radio propagation characteristics that allow mobile phone signal to penetrate deeper into buildings with less attenuation than the 1700 MHz or 2100 MHz bands.

AT&T Mobility devices use former TV channel 55 nationwide (purchased from Qualcomm's defunct MediaFLO pay TV service), and also channel 56 in densely populated areas such as California and the Northeast Corridor. Verizon Wireless holds frequencies just above TV channel 51, which is still in use, causing adjacent-channel interference that is preventing the carrier from using them until the planned top-down spectrum repacking occurs. It more recently acquired higher blocks within the former TV band, which it plans to use first.

See also

This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.