This antenna was designed to specifically convert poorly performing Cellular phones into HAC (Hearing Aid Compatibility) compliant. In doing so, it also reduces the absorption of the radiated energy by the user's tissue, particularly by the head and regions near the ear. This little known parameter of a wireless phone is regulated by Government bodies
at a maximum level of 1.6 Watt/kg of tissue. You can find your phone's SAR rating at the bottom of your phone's Specifications Sheet, in your user's manual. Laboratory measurements reveal that the Vortis reduces SAR to less than a tenth (0.01) of the original value (to approx. 0.07 W/kg). This additional energy (that not
absorbed by the user's tissue) is then available to the wireless link.
As a receiving antenna, the Vortis enjoys two special advantages: (1) since it does not rely on the Cellular Phone's printed circuit board for its ability to radiate, as most cell phone antennas do (especially at the low band), the noise generated by internal circuitry, particularly from processor and digital circuits, is substantially isolated. Furthermore, (2) the antenna's null region includes the core of the handset (where most digital circuits generally lie), realizing an effective shield from internally generated noise. The rejection of this noise, allows the handset's receiver to "see" weaker signals, providing the user greater reach/range. Users of the Vortis normally report substantial improvement (fewer dropped calls), particularly in fringe areas.
Below are some crude but instructive "Engineering" videos of the Vortis. The sensor seen in the videos is a "Rectenna", an antenna with a built-in detector (rectifier). The noise is produced by the ON-OFF keying or duty of the cellular phone. This type of noise is characteristic of GSM and TDMA protocol handsets. CDMA phones transmit and receive continuously and do not generate noise to this degree. The rectenna sensor is connected to an audio amplifier and speaker, which the camera recorded. Another video shows how simple it is to install a Vortis antenna on a V557 handset. Videos are in Apple Quicktime MOV video format.
Hear the Vortis in action.
Hearing Aid users should recognize the noise all too well. Non-hearing aid users: the noise intensity is a measure of RF energy detected by the sensor.
Hear the V557 rectified noise (without a Vortis).
Hearing Aid users should recognize the noise all too well. Non-hearing aid users: the noise intensity is a measure of RF energy detected by the sensor.
How to install Vortis on your V557/V551 cellular phone.
TECHNICAL SPECIFICATIONS
- Frequency range: US Cellular Bands (800 & 1900 MHz)
- Coverage: Figure-8 with better than 10 dB Null in the direction of user GRAPH
- Polarization: Linear, Vertical
- Peak Gain: -1 dBil (800 MHz transmit) and +2 dBil (1900 MHz transmit)- - improved Noise Figure/sensitivity (receive bands)
- Nominal Impedance: 50 ohm (RF), Short Circuit (DC)
- Input Power: 1 Watt CW, 2 Watts Peak
- VSWR: under 3.0 (transmit bands)
- Connector: built in to mate with Motorola V500 series mobile/cellular phones
- Mounting: Mounts directly to back of handset
- Operating Temperatures: -40C to +85C
- Shipping Weight: 0.5 kg / 1 lbs (shipped individually)
NOTES:
- Specifications and prices are subject to change without notice
- US Patent 6844854