TechBlog

Antennas serve as transducers between electromagnetic waves traveling in free space and guided electromagnetic signals in circuits. As such, they play a critical role in the performance of wireless communication systems. With the proliferation of mobile wireless services that deliver voice and/or data in smaller and smaller devices, the task to design an antenna for a portable unit that meets not only operational requirements but also aesthetic and packaging restrictions is becoming more and more challenging. As result, engineers rely on a combination of theory, simulation, and experimental investigation to arrive at a design that meets all the demands of a particular application.

Basic Antenna Parameters

The basic parameters of antenna are impedence, mismatch and ohmic efficiency, radiation pattern and polarization, directivity, gain and equivalent isotropically radiated power, and effective height and aperture. In addition, celebrated Friis equation is and equations for the signal to noise ratio (SNR) of an antenna and source-field relationships are also important.For a more detailed treatment of the material pointed out here, the reader is referred to “A HANDBOOK OF ANTENNA IN WIRELESS COMMUNICATION” OF CRC Press by Lal Chand Godara.

Continue reading ‘Future Antennas Will be Flat’ »

The all new LandMark20 MEMS IMU is a silicon low noise digital Inertial Measurement Unit (IMU) that provides internally temperature compensated RS485 output of delta velocity and delta theta.
Features:

• Low Noise Silicon MEMS Digital IMU
• Low Gyro Noise 0.028º/sec/?Hz
• Fully Temperature Compensated Bias and Scale Factor
• Compensated G-Sensitivity and Misalignment
• In Run Gyro Bias 6° to 60°/hour typical
• Low Power < 1/2 watt typical
• Light Weight 113 grams
• Small Size < 67.5cm3/4.1in3
• Low Voltage +3.0 to 4.2V (single sided power)
• Bandwidth 100 Hz (user selectable)
• RS485 Output 200 Hz (user selectable)
• Bandwidth Filtering Capability
• Vibration Isolation
• Precision Alignment
• 3 Internal Temp. Sensors
• Self Test
• Shock Resistant
• Long Life
• Export Classification: Commerce ECCN7A994 Pending

The LandMark20 IMU is ideal for applications requiring improved performance MEMS gyros, but also needing ultra low power consumption, small size, light weight and no inherent wear out modes for long life. The signature feature of the LandMark20 IMU is the improved gyro performance. The low noise gyros enable precision measurement and improved in-run and bias over temperature. The IMU’s performance is optimized with fully temperature compensated bias and scale factor and compensated misalighnment and g-sensitivity. The rate outputs are free from bias steps and linear outputs are without acceleration hysteresis. The unit is highly durable and can withstand environmental vibration and shock typically associated with commerical aircraft requirements.

Continue reading ‘Silicon Low Noise Digital Inertial Measurement Unit Landmark 20 IMU’ »

From Tesla and Marconi’s electric coils and arcs to the youngster’s model car that speeds or stops at the nudge of the controls, we’ve had a fascination with wireless control and communication.

And with the explosion over the last 25 years of wireless from cell phones to Internet, interest in industrial uses has grown. This could easily afflict anyone from refinery or public works managers to manufacturing techs with equipment monitoring and control needs.

Regardless of the potential, early attempts to adapt wireless technology to industrial applications met with limited success.

Continue reading ‘Industrial Wireless Modems Come of Age’ »

Continue reading ‘WIRELESS ALARM MONITORING and CONTROL’ »

SWR has selected The Technology Partnership (TTP) to join the ‘Future Radio’ project which will trial innovative new visual interactive radio services in Germany. The ‘Future Radio’ project will start its first trial in Stuttgart this summer. SWR and TTP will present the aims of the ‘Future Radio’ project to broadcasters and operators at CeBIT in Hannover, 4^th - 9^th March 2008.

Under the ‘Future Radio’ project SWR and TTP will work to define an open service delivery specification that enables new visual, interactive and download services on any digital radio receiver. These services will enable mobile phone users to listen to digital radio and to view, navigate and store visual content, such as images, slides, weather information, music tracks and podcasts which are broadcast in association with radio stations.

TTP’s nanoDABTM accessory, the world’s first Bluetooth headset accessory with built-in DAB digital radio, and mobile phone software will provide the test platform for the trial. nanoDABTM was publicly unveiled at Mobile World Congress in Barcelona a few weeks ago where it received excellent feedback from both broadcasters and mobile operators.

Continue reading ‘Digital Radio Project To Enable Multimedia-DAB On Mobile Phone’ »

The Nintendo Wii’s use of a MEMS-enabled motion controller and the Apple iPhone’s use of accelerometers to change the display from horizontal to vertical are examples of how MEMS are creating new ways for people to interact with electronic devices. They illustrate the continued expansion of MEMS technology from its beginnings in the automotive and industrial markets to applications that include energy harvesting, wireless communications, “smart homes,” and biomedical.

Big numbersAccording to the analyst group Yole Développement, the market was worth $5.8 billion in 2006 and will grow to $10.7 billion by 2011. The leading MEMS application, inkjet heads, is followed closely by sensors for airbag deployment and tire inflation monitoring. Texas Instruments (TI) makes Digital Light Processing (DLP) MEMS for computer displays as well as for digital projection. Wicht Technologie Consulting says that TI was the top MEMS manufacturer in 2006, with $905 million in revenues. TI has reportedly shipped more than 10 million DLP sub-systems since 1996.

While MEMS technology is about more than high-volume production, others have been similarly successful with mass production. ST Microelectronics’ 3-axis accelerometer is the enabling force within Nintendo’s Wii, and Analog Devices says it has shipped more than 250 million MEMS accelerometers for automotive, consumer, and industrial applications.

Continue reading ‘MEMS is moving. Here’s where.’ »

Motion suit eliminates need for multiple camerasAt the 2008 Consumer Electronics Show here in Las Vegas, Xsens Technologies B.V. yesterday demonstrated a motion capture suit that eliminates the need for multiple cameras and optical markers.

Known as the Moven motion capture system, the new suit incorporates three Analog Devices gyroscopic sensors, three accelerometers, three magnetometers and an Analog Devices Blackfin digital signal processor (DSP). All of the sensors reside in a small module that measures approximately 2 inches x 1 inch and fits under a motion suit. One suit incorporates 16 of the sensors modules. Using the company’s software, motions are captured and displayed on a PC screen.

“We’re adding software algorithms to handle data from the sensors and apply it to a biomechanical model of a human being,” says Gerben Groothuis, director of marketing and sales for Xsens.

Continue reading ‘Motion Suit Could Simplify Biomechanics Studies’ »