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.

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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’ »