WyTec LLC's Patents

U.S. Patent No. 5,875,396 “Multichannel radio frequency transmission system to deliver wideband digital data into independent sectorized service areas” was issued February 23, 1999 and has a priority date of November 13, 1995. The patent covers a one-way and two-way multichannel radio frequency transmission system and method employing a sectorized broadcasting technique is described. The system and method reduces the effective bandwidth of the broadcast signal by multiplexing available channels of signals into a set of formatted independent digital bitstreams--where each of the bitstreams includes all or a portion of the available channels provided by the system program provider. The independent bitstreams are transmitted to transmitting towers using point-to-point transmission methods. The transmitting towers phase modulate and amplify the bitstreams to generate a set of independent modulated signals. Each transmitter tower includes an antenna for broadcasting the modulated signals to a sectorized service area--each sector in the service area receiving a different one of the set of independent modulated signals. The antenna includes a set of individual antenna panels--each panel for broadcasting one of the set of modulated signals. Each subscriber site demodulates, demultiplexes and selects one channel from the received modulated signal. Each transmitting tower broadcasts all of the independent modulated signals at one of a set of operating frequencies such that adjacent transmitting towers broadcast at different operating frequencies. In addition, adjacent antenna panels of a given antenna transmit at opposite transmission polarity. Click here for a .pdf of the patent.

U.S. Patent No. 5,914,620 “Frequency doubling of a quadrature-amplitude modulated signal using a frequency multiplier” was issued June 22, 1999 and has a priority date of April 9, 1997. The patent covers a method and system of frequency multiplying a signal having amplitude modulation using a frequency multiplier operated at a bias voltage that is less than its saturation mode voltage is described. Prior to amplification, the amplitude modulated signal is pre-distorted to compensate for distortion caused by the frequency multiplier. A first pre-distortion phase converts the amplitude modulated signal into a corresponding square root signal to compensate for a first distortion type. A second pre-distortion phase pre-distorts the square root signal to compensate for the distortion caused by biasing the frequency multiplier at a voltage less than the saturation voltage of the multiplier. As a result, a signal that is amplitude modulated can be multiplied by a frequency multiplier. Click here for a .pdf of the patent.

U.S. Patent No. 5,923,229 “Simultaneous polarization and frequency filtering of transmitter and receiver signals in single antenna systems” was issued July 13, 1999 and has a priority date of September 12, 1997. The patent covers an integrated OMT/filter assembly is small, low cost and not easily susceptible to mechanical or environmental damage. The integrated OMT/filter assembly has a body formed at least in part of conductive material, the body including a first port for receiving a transmit signal, a second port for feeding the transmit signal to an antenna and for receiving a receive signal, and a third port for receiving the receive signal. A first waveguide segment joins the first and second ports, and a second waveguide segment joins second and third ports, the first and second waveguide segments having a portion in common. A filter element is disposed within at least one of the first and second waveguide segments. Click here for a .pdf of the patent.

U.S. Patent No. 6,041,219 “Integrated orthogonal mode transducer/filter design for microwave frequency-domain” was issued March 21, 2000 and has a priority date of October 1, 1998. The patent covers a printed circuit board (PCB) transceiver I/O filter design which provides both polarization and isolation filtering includes a receive probe positioned in a first orientation in an opening of the PCB which has a feed waveguide attached to it on a first side of the PCB. Receive signals propagate into the feed waveguide and excite the probe causing the receive probe to couple the received signals to receive circuitry. The transceiver design further includes an enclosed waveguide structure attached to the PCB having a first end positioned over the PCB opening and a second end positioned over a transmit probe which is positioned in a second orientation orthogonal to the receive probe. The transmit probe is excited by transmit circuitry and couples signals into the waveguide structure through the PCB opening and out the feed waveguide. Since the transmit probe is orthogonally oriented with respect to the receive probe, transmit signals emitted by the transmit probe are polarized orthogonally with respect to the receive signals thereby providing polarization isolation of the receive and transmit signals in the feed waveguide and the PCB opening area. The enclosed waveguide can be constructed to have an associated cut-off frequency that is greater than the maximum frequency of the receive signals thereby providing isolation filtering in the enclosed waveguide of signals in the receive signal frequency range. Alternatively, the waveguide structure can be designed as a bandpass filter to provide isolation filtering between receive and transmit signals. Click here for a .pdf of the patent.

U.S. Patent No. 6,243,427 “Multichannel radio frequency transmission system to deliver wideband digital data into independent sectorized service areas” was issued June 5, 2001 and has a priority date of November 13, 1995. The patent covers a one-way and two-way multichannel radio frequency transmission system and method employing a sectorized broadcasting technique is described. The system and method reduces the effective bandwidth of the broadcast signal by multiplexing available channels of signals into a set of formatted independent digital bitstreams – where each of the bitstreams includes all or a portion of the available channels provided by the system program provider. The independent bitstreams are transmitted to transmitting towers using point-to-point transmission methods. The transmitting towers phase modulate and amplify the bitstreams to generate a set of independent modulated signals. Each transmitter tower includes an antenna for broadcasting the modulated signals to a sectorized service area each sector in the service area receiving a different one of the set of independent modulated signals. The antenna includes a set of individual antenna panels each panel for broadcasting one of the set of modulated signals. Each subscriber site demodulates, demultiplexes and selects one channel from the received modulated signal. Each transmitting tower broadcasts all of the independent modulated signals at one of a set of operating frequencies such that adjacent transmitting towers broadcast at different operating frequencies. In addition, adjacent antenna panels of a given antenna transmit at opposite transmission polarity. Click here for a .pdf of the patent.