Twitter Weekly Updates for 2010-04-29
Posted on | April 29, 2010 | No Comments
- Going wireless with your health care. Remote monitoring devices aim to prevent chronic-disease complications http://ow.ly/1yGBf #
- Mobile health platform wins $150,000 in prizes http://ow.ly/1CRna #
- Broadband plan calls for 100Mb/s Internet access across United States http://ow.ly/1yGCT #
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Antenna efficiency
Posted on | April 29, 2010 | No Comments
The efficiency of an antenna relates the power transited from M2M module to the antenna and the power radiated or dissipated within the antenna. A high efficiency antenna has most of the power present at the antenna’s input radiated away. A low efficiency antenna has most of the power absorbed as losses within the antenna. Even when the M2M module transmits the power and supports perfect 50 Ohm impedance the loss in the coaxial cable can be already high. Think about that 3 dB is already 50%. With a good embedded antenna on reasonable ground plane, the antenna efficiency of an M2M system can be much better, because no coaxial cable or very short coaxial cable will be used.
Broadband plan calls for 100Mb/s Internet access across United States
Posted on | April 29, 2010 | No Comments
Broadband plan calls for 100Mb/s Internet access across United States http://ow.ly/1yGCT
PTRCB Over-the-Air Test
Posted on | April 28, 2010 | No Comments
PTRCB Over-the-Air Test ( TRP, TIS and RSE )
For cellular applications such as 2G or 3G basic RF performance is measured in terms of the product being able to transmit and receive reliably on a network. The scientific way to measure performance is in an anechoic chamber. The measurements numbers used are outlined here;
TRP – Total Radiated Power
This defines how much power is being radiated from the device and is measured in dBm. The higher this number, the better the device is able to transmit.
TIS – Total Isotropic Sensitivity
This defines how low a signal the device can receive and demodulate. The lower this number (with a minus figure) the better the device can operate in weak signal environments.
RSE – Radiated Spurious emissions
In practice this is the most difficult test for cellular products to pass. These are radio waves output by the device which are above the power limit set by regulatory authorities to avoid interference. When a test confirms a radiated spurious emission over the limit either the device or the antenna must be modified to get it below the limit and thus pass certification. Otherwise the device cannot be sold in that country.
Different operators, especially in the USA (such as AT&T, Sprint etc) have specific numbers for TRP and TIS that the device must reach to be accepted on their networks. Other operators do not specifically set any requirements. No matter if it is mandatory or not, it is our experience that the wireless products with the best TRP and TIS values succeed in the market. Passing RSE is mandatory for any operator whom requires PTCRB or type approvals. A design that has optimized TRP/TIS will usually pass RSE on the first attempt.
Wireless products are regulated in each country by slightly different standards.
Credit: Taoglas
2. Performance
The Basic concepts – TRP, TIS and RSE
For cellular applications such as GSM or CDMA basic RF performance is measured in terms of the product being able to transmit and receive reliably on a network. The scientific way to measure performance is in an anechoic chamber.
The measurements numbers used are outlined here;
TRP – Total Radiated Power
This defines how much power is being radiated from the device and is measured in dBm. The higher this number, the better the device is able to transmit.
TIS – Total Isotropic Sensitivity
This defines how low a signal the device can receive and demodulate. The lower this number (with a minus figure) the better the device can operate in weak signal environments.
RSE – Radiated Spurious emissions.
In practice this is the most difficult test for cellular products to pass from Taoglas’ experience. These are radio waves output by the device which are above the power limit set by regulatory authorities to avoid interference. When a test confirms a radiated spurious emission over the limit either the device or the antenna must be modified to get it below the limit and thus pass certification. Otherwise the device cannot be sold in that country.
Different operators, especially in the USA (such as AT&T, Sprint etc) have specific numbers for TRP and TIS that the device must reach to be accepted on their networks. Other operators do not specifically set any requirements. No matter if it is mandatory or not, it is our experience that the wireless products with the best TRP and TIS values succeed in the market. Passing RSE is mandatory for any operator whom requires PTCRB or type approvals. A design that has optimized TRP/TIS will usually pass RSE on the first attempt.
Wireless products are regulated in each country by slightly different standards.
Mobile health platform wins $150,000 in prizes
Posted on | April 28, 2010 | No Comments
Mobile health platform wins $150,000 in prizes http://ow.ly/1CRna
Going wireless with your health care
Posted on | April 28, 2010 | No Comments
Going wireless with your health care. Remote monitoring devices aim to prevent chronic-disease complications http://ow.ly/1yGBf
PTCRB approval
Posted on | April 27, 2010 | No Comments
GSM and 3G M2M applications supporting North American 2G/3G networks require PTCRB approval (PTCRB Type Certification Review Board) in order to be accepted by the network operators in US and Canada. PTCRB approval ensures a M2M device is compliant with the appropriate technological standards, regulatory requirements and certain operator requirements (e.g. Over-the-Air performance test).
The PTCRB approval includes:
- Conformance Testing for 2G/2.5G Technologies
- Conformance Testing for 3G Technologies
- TTY and SIM/USIM Testing
- Application Enabler (AE): MMS, PoC, VT
- TRP & TIS Measurements (Over-the-Air Performance Tests)
- Radiated Spurious Emissions Testing
- Specific Absorption Rate (SAR)
- FCC & IC Testing and Approval
The listed 2G and 3G modules at website are PTCRB pre approved. Anyhow the Over-the-Air Performance is interfered by the antenna and ground plane you will use for your M2M application.
Embedded GSM antenna
Posted on | April 26, 2010 | No Comments
Embedded GSM antenna based on flexible PCB
A flexible PCB gives you an ultra flat shape and the freedom to glue the embedded GSM antenna inside your box, even it has a rounded shape. This embedded GSM antenna is ideal for use with cellular modules with Assisted GPS functionality on board where only one antenna connection is available. The antenna has been designed in a flexible material with a rectangular form -factor and cable connection for an easy installation. The embedded GSM antenna works on different plastics and thickness.
Technical data of this embedded GSM antenna
- Supported band: GSM 850,900,1800,1900, UMTS 2100
- Frequency (MHz): 824~960 1710~2170
- Impedance: 50 Ω
- Dimensions (mm): Ultra small 70 x 20 x 0.1
- Ground plane used (mm): 106 x 45
- Gain: 1.5 dbi ~ 3 dbi
- Band, frequency, antenna efficiency
- GSM 850/900 , 824 ~ 960 MHz, 52~55%
- GSM 1800, 1710 ~ 1850 MHz, 60%
- GSM 1900, 1850 ~ 1990 MHz, 62%
- UMTS 2100, 1920 ~ 2170 MHz, 65%
- GPS 1575.42 MHz 50%
Twitter Weekly Updates for 2010-04-22
Posted on | April 22, 2010 | No Comments
- http://tr.im/VQWk #
- Wireless ZigBee technology soon might expand its role in homes to control smart meters, TVs and other devices http://ow.ly/1yGs6 #
- Philips suggests dedicated mHealth spectrum http://ow.ly/1vStW #
- M2M module with 22×22x3 mm only http://ow.ly/1zCaB #
- 3G module with embedded GPS http://ow.ly/1zDix #
- ZigBee Health Care Profile for download http://ow.ly/1yJTN #
- MedAlirti SMS Text Solution With Imagery and Video to Improve Communication in Healthcare http://ow.ly/1yJWd #
- Cornwall Mainstreams Telehealth Solutions http://ow.ly/1yGuf #
- FCC mobile network plan could revolutionize health care http://ow.ly/1yGw4 #
- Daily Herald | Technologies that let patients consult doctors online spreading rapidly http://ow.ly/1yGx8 #
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Daily Herald | Technologies that let patients consult doctors online spreading rapidly
Posted on | April 22, 2010 | No Comments
Daily Herald | Technologies that let patients consult doctors online spreading rapidly http://ow.ly/1yGx8