We Can

We Can….
MEI can improve your low-power wireless product or communications system in a number of ways. It is not unusual to double or even triple your link’s range by implementation of such improvements.
  • MEI can improve your existing antennas or design new, more efficient ones
  • MEI can tailor radiated/received signal polarization to better the quality of the wireless connection
  • MEI can enhance your receiver’s sensitivity and signal detection probability through IF (Intermediate Frequency) or post-IF signal processing
  • MEI can greatly reduce your receiver’s false detection rate
  • MEI can make adaptive antennas that cooperatively work with your receiver to maximize your radio link’s capabilities at all times
  • As a last resort, MEI can re-design a portion or all of your transmitter/receiver RF (Radio Frequency) electronics to further improve your wireless product or communications system.
  • If a component of your radio link is powered by batteries, MEI can extend the life of the batteries while retaining your present range, or sometimes, even by extending the system’s range.
  • If you are not sure of the performance of your link, MEI can evaluate it for you and provide a professional test report with hard data.

If you manufacture wireless products (Cordless/Cellular/PCS/CT-2 Telephones, Portable Radios/Radio MODEMs, etc.) and are dissatisfied with your product’s radiative characteristics, we can significantly improve your wireless product’s electromagnetic performance. We can measure, identify and cure undesired antenna pattern perturbations caused by interactions with the various subsystems comprising your product (Printed Circuit Boards, cables, hook-up wires, batteries, etc.), and/or by an improper antenna design.

As an illustration of how an antenna’s pattern can be perturbed by other subsystems, below is a 3D view of a typical vertically polarized antenna (normally has omnidirectional azimuthal coverage) attached to a portable computer with a wireless MODEM. The antenna is mounted on the top left corner, and the 3D view is from the top, looking down on the keyboard. Note the large gain variation around the device.

Antenna's Pattern

Antenna's Pattern

Transmitter:

  • Power output: 1 Watt into 50 ohms
  • Data Rate: 1 or 2 Mbit/second
  • Modulation: 2 or 4 level FSK, Analog FM
  • Bandwidth: 1 MHz
  • Frequency Agile Control: Crystal Controlled PLL Synthesizer
  • Fast Tuning: Continuous from 2.2 GHz to 3.0 GHz, designed for frequency hopping Spread Spectrum operation
  • Monitoring outputs: Buffered and filtered Forward and Reverse Power and several test points
  • Construction: Single Sided Surface Mount parts
Chart

Representative output signal spectrum when modulated with an oscillatory 2-FSK data stream

Receiver:

  • Sensitivity: -92 dBm using 2 level FSK
  • Stability: Unconditionally Stable
  • Input Noise figure: Less than 1.5 dB from 50 ohm source antenna
  • System Noise figure: Less than 6 dB from 50 ohm source antenna
  • IP3: +5 dBm
  • First IF: UHF with 4 pole filter
  • Second IF: HF with 8 pole 1 MHz wide filter and group delay equalizer
  • First LO: Agile PLL Synthesizer with continuous coverage from 2.2 GHz to 3.0 GHz
  • Second LO: Multiplied Crystal
  • First IF Image Rejection Ratio: more than 80 dB
  • Second IF Image Rejection Ratio: more than 60 dB
  • Adjacent Channel Rejection Ratio: more than 66 dB
  • Second Adjacent Channel Rejection Ratio: more than 80 dB
  • Outputs: Buffered and filtered FM Demodulator and RSSI and several test points
  • Construction: Single Sided Surface Mount parts

Modem

NOTE: In the picture above, the resolution was deliberately reduced to protect some of MEI’s Intellectual Property. Please note that the technologies used in the above device are Patent pending.

MODEM and Transceiver Controller:

  • Firmware controlled data rate, modulation levels, shape and filtering
  • Firmware controlled transmitter and receiver frequencies
  • Several A/D and D/A converters to send and receive analog info from the transceiver and monitor all test points
  • Construction: Double Sided Surface Mount parts

Modem 2

NOTE: In the picture above, the resolution was deliberately reduced to protect some of MEI’s Intellectual Property. Please note that the technologies used in the above device are Patent pending.

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