Topic
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.
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Patent•
24 Nov 2020
TL;DR: In this paper, a vehicle lock control method and a device thereof, vehicle lock equipment and a storage medium are provided, and the method comprises the steps: controlling a network mode of the vehicle lock to be switched from a GSM mode to an NBIOT mode when determining that the first switching time is up, and when it is determined that the second switching time was up, controlling the network mode for the VANET, so that vehicle lock communicates with the server based on the GSM Mode.
Abstract: The embodiment of the invention provides a vehicle lock control method and a device thereof, vehicle lock equipment and a storage medium, and the method comprises the steps: controlling a network modeof a vehicle lock to be switched from a GSM mode to an NBIOT mode when determining that first switching time is up so as to enable the vehicle lock to communicate with a server based on the NBIOT mode; and when it is determined that the second switching time is up, controlling the network mode of the vehicle lock to be switched from the NBIOT mode to the GSM mode so that the vehicle lock communicates with the server based on the GSM mode. The problems that in the prior art, power consumption is large, GSM signals are weak, and vehicles cannot be accurately monitored are solved.
Patent•
19 Mar 2002
TL;DR: In this article, a bias voltage setting circuit is used to set an optimum bias voltage for the GSM 900 frequency band to a first stage amplifier and a second stage amplifier, and the transmission signal is amplified by the two amplifiers.
Abstract: When a signal of GSM 900 frequency band is transmitted, a bias voltage setting circuit sets an optimum bias voltage for the GSM 900 frequency band to a first stage amplifier and a second stage amplifier. The transmission signal is amplified by the two amplifiers. A signal that is output from the second stage amplifier is supplied to a low-pass filter. The low-pass filter attenuates unnecessary radiation waves from the transmission signal. A GSM 900 frequency band amplifier amplifies the output signal of the low-pass filter and outputs the amplified signal. When a signal of DCS 1800 frequency band is transmitted, the bias voltage setting circuit sets an optimum bias voltage fro the DCS 1800 frequency band to the first stage amplifier and the second stage amplifier. A DCS 1800 frequency band amplifier amplifies an output signal of the second stage amplifier, and outputs the amplified signal.
01 Oct 2012
TL;DR: In this article, an automated electric field measurement system is presented, associated with a statistical analysis of the results obtained from a survey in the GSM 900, GSM 1800 and 3G downlink frequency bandwidths for different time frames.
Abstract: Measuring the electric field due to wireless communication systems is an important part for determining the electromagnetic pollution of the environment and consequently human exposure to these fields. Many difficulties need to be considered when performing these tests. An automated electric field measurement system is presented in this paper, associated with a statistical analysis of the results obtained from a survey in the GSM 900, GSM 1800 and 3G downlink frequency bandwidths for different time frames. Instantaneous measurements were taken at 1 second intervals and the minimum, maximum, average, standard deviation and the cumulative density were calculated.
TL;DR: A novel internal chip antenna with low profile for GSM/DCS/PCS band mobile phone is presented and computed results and experiment results for the proposed design are presented.
Abstract: A novel internal chip antenna with low profile for GSM/DCS/PCS band mobile phone is presented. The size of the antenna is 13.5 × 5.8 × 3.4 mm3. The minimization of the antenna is realized by using meander line and spiral line pattern printed on FR-4 with dielectric constant 4.4. The meander line is designed on bottom and top surface connected with via, which assures the GSM frequency in small size. Wide-bandwidth of the upper band is realized by overlapping high order resonances of both meander line and spiral line. The details of the computed results and experiment results for the proposed design are presented.