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GSM frequency bands

About: GSM frequency bands is a research topic. Over the lifetime, 559 publications have been published within this topic receiving 5067 citations.


Papers
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01 Jan 2016
TL;DR: The the gsm system for mobile communications is universally compatible with any devices to read, and is available in the book collection an online access to it is set as public so you can get it instantly.
Abstract: Thank you very much for reading the gsm system for mobile communications. As you may know, people have search hundreds times for their favorite novels like this the gsm system for mobile communications, but end up in infectious downloads. Rather than enjoying a good book with a cup of tea in the afternoon, instead they are facing with some malicious virus inside their desktop computer. the gsm system for mobile communications is available in our book collection an online access to it is set as public so you can get it instantly. Our book servers saves in multiple locations, allowing you to get the most less latency time to download any of our books like this one. Kindly say, the the gsm system for mobile communications is universally compatible with any devices to read.

71 citations

Patent
24 Mar 2010
TL;DR: In this paper, a technique for achieving reduction in size of an electronic device with a power amplifier circuit, while enhancing the performance of the electronic device, is provided, where the first and second semiconductor chips, a passive component, and the second and second integrated passive components are mounted over a wiring board.
Abstract: A technique is provided for achieving reduction in size of an electronic device with a power amplifier circuit, while enhancing the performance of the electronic device. An RF power module for a mobile communication device includes first and second semiconductor chips, a passive component, and first and second integrated passive components, which are mounted over a wiring board. In the first semiconductor chip, MISFET elements constituting power amplifier circuits for the GSM 900 and for the DCS 1800 are formed, and a control circuit is also formed. In the first integrated passive component, a low pass filter circuit for the GSM 900 is formed, and in the second integrated passive component, a low pass filter circuit for the DCS 1800 is formed. In the second semiconductor chip, antenna switch circuits for the GSM 900 and DCS 1800 are formed. Over the upper surface of the wiring board, the second semiconductor chip is disposed next to the first semiconductor chip between the integrated passive components.

66 citations

Patent
Juha Ellä1
30 Mar 2004
TL;DR: In this article, a band-reject filter comprising at least a series and a shunt acoustic-wave resonators is used to create a deep notch at the receive frequency band, and a plurality of inductive elements for matching static capacitance of the resonators at the passband frequency.
Abstract: A filter arrangement for use in a multiband dual-mode mobile phone. In particular, the mobile phone is operable in a W-CDMA mode and a band-reject filter comprising at least a series and a shunt acoustic-wave resonators is used to create a deep notch at the receive frequency band. The band-reject filter further includes a plurality of inductive elements for matching static capacitance of the resonators at the passband frequency. The mobile phone is also operable in 1800 and 1900 GSM bands. The band-reject filter is operatively connected to a harmonic trap in order to eliminate the third harmonic of these GSM bands. The mobile phone is also operable in the lower GSM band, for which a harmonic filter can share an antenna path with the band-reject filter.

65 citations

Journal ArticleDOI
TL;DR: In this paper, a compact internal antenna that is composed of a coupled loop with two branch lines is presented, which operates at two wide frequency bands (698 ~ 960 MHz/1710 ~ 2690 MHz).
Abstract: A compact internal antenna that is composed of a coupled loop with two branch lines is presented. The proposed antenna operates at two wide frequency bands (698 ~ 960 MHz/1710 ~ 2690 MHz) to cover octabands LTE 700/GSM 850/GSM 900/DCS 1800/PCS 1900/WCDMA 2100/LTE 2300/LTE 2500 for the 4G mobile handset. The proposed antenna is designed and fabricated on a support (polyester; er=3.2) with a limited volume, i.e., 7×11×46 mm3. The design methods and the measured results of the proposed antenna are presented in detail.

64 citations

Proceedings ArticleDOI
01 Jan 2003
TL;DR: The antenna efficiency and mean effective gain of several commercial (predominantly dual band) mobile phones are evaluated over the GSM 900 frequency range and it is shown that much of the efficiency reduction is due to loss in the hand - phantom measurements confirm this.
Abstract: The antenna efficiency and mean effective gain (MEG) of several commercial (predominantly dual band) mobile phones are evaluated over the GSM 900 frequency range. Measurements are performed both statistically, in the presence of people, and with phantom heads and hands. Particular attention is given to the different loss terms involved, such as mismatch and spatial filtering, and to the relative contributions to loss of different parts of the body. The method used is that of 3D radiation pattern integration based on fast spherical near field measurements around the combination of the user and phone. Helical, "flip" and planar inverted-F antenna (PIFA) designs are evaluated. Results show that reasonable convergence is achieved with approximately 15 users. The average efficiency is in the 3-8% range for all phones when used next to the head. Measurements away from the head show that much of the efficiency reduction is due to loss in the hand - phantom measurements confirm this. The loss mechanisms at GSM 900 are compared to those previously reported at 1800 MHz.

60 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20221
202111
202015
201924
201828
201734