A repeater and associated method of use includes at least one antenna element for communicating in one direction and at least one antenna element for communicating in another direction. A radio frequency uplink path and a radio frequency downlink path are coupled between the antennas. At least one of the radio frequency uplink path or the radio frequency downlink path includes an adaptive cancellation circuit. The adaptive cancellation circuit is configured to generate a cancellation signal without requiring an injected signal. The cancellation signal, when added to a radio frequency signal in the respective uplink and downlink paths, substantially reduces feedback signals present in the radio frequency signal.

Repeaters for wireless communication systems

The present invention provides a satellite broadcast receiving and distribution system that will permit for the transmission of vertical and horizontal or left-hand circular and right-hand circular polarization signals simultaneously via a single coaxial cable. The system of the present invention will accommodate two different polarity commands from two or more different sources at the same time. This satellite broadcast receiving and distribution system of the present invention will provide for the signals received from the satellite to be converted to standard frequencies so as to permit for signals to travel via existing wiring which the present day amplifiers can transport in buildings, high-rises, hospitals, and the like so that satellite broadcasting can be viewed by numerous individuals by way of a single satellite antenna.

Satellite broadcast receiving and distribution system

An antenna element having a vertically stacked structure and a phased array antenna that includes a plurality of antenna elements sharing a common conductive ground plane are described. The phased array antenna also includes a common conductive shell electrically coupled to the common conductive ground plane and extending away there from to encompass the antenna elements. The common conductive shell and the common conductive ground plane together define a common cavity having a common aperture. The phased array antenna also includes a common dielectric superstrate layer disposed over the common cavity at a predetermined distance from the antenna elements and a beam steering system coupled to the antenna elements and configured for steering an energy beam produced by the phased array antenna.

Phased array antenna

A television distribution system includes a frequency agile satellite transponder down converter operating in the satellite block converted frequency range, typically 950-1450 MHz, along with an IF stage incorporating bandpass filtering and a frquency agile up converter. This arrangement allows a head-end configuration with optimum selection of transponders from one or more satellites and with both vertical and horizontal polarities. The transponders are converted to an available slot allowing twelve slots to accommodate transponders of preference. The block may then be distributed to multiple subscribers in apartment complexes, condominiums and subdivisions.

Method and system for receiving and distributing satellite transmitted television signals

A system for redistributing a broadband audio-visual-data signal to a multiplicity of receiver units within a multiple dwelling unit (MDU) includes a main receiving antenna that receives a broadband video/audio/data signal having a number of individual program multiplex signals therein and a transmodulator device that transmodulates the individual program multiplex signals associated with the broadband signal from a first modulation scheme to a second modulation scheme to reduce the bandwidth of the broadband signal The transmodulated signals are broadcast over a cable network, along with terrestrial signals, to individual receiver units at the MDU The receiver units demodulate the transmodulated and/or terrestrial signals and provide user-specified channels to television sets for display

Transmodulated broadcast delivery system for use in multiple dwelling units

Apparatus for receiving super high frequency signals having an outdoor unit which includes a converter for converting super high frequency signals received by an antenna to ultra high frequency signals, a local oscillator for generating a local signal supplied to the converter a switch for switching the frequency of the local signal, and a detecting circuit for detecting an operating voltage supplied to the outdoor unit and the value of which is changed according to a band range of the super high frequency signals, the output of the detecting circuit controlling the switch, an indoor unit which includes a demodulator demodulating the ultra high frequency signals, and a circuit generating the operating voltage; and a coaxial cable supplying the ultra high frequency signals from the outdoor unit to the indoor unit and also supplying the operating voltage from the indoor unit to the outdoor unit.

Super high frequency receiver

A suspended line feed type planar antenna is arranged with a number of antenna elements formed on a film-shaped substrate, and the film-shaped substrate is sandwiched between a plastic radome and a plastic rear cover, a conductive surface is plated on the rear surface of the plastic radome at its portion except the portions opposing the antenna elements and/or a conductive surface is plated on the whole front surface of the rear cover. The conductive surfaces and the antenna elements constitute resonance type printed path radiators, whereby the planar antenna of the invention can be simplified in construction and reduced in cost, thickness and weight, and the planar antenna of the invention can be increased in productivity and reliability.

Microwave antenna structure with intergral radome and rear cover

An antenna apparatus has a first wire-like antenna element formed into a rectangular planar loop and a second antenna element which comprises two L-shaped plates electrically connected to the loop and mounted to a rectangular planar base member. The loop is hinged to the planar base member along long sides of the respective rectangles so that the angle between the planes of the loop and base member is adjustable. The base member pivots about an axis on a mount which can be secured to a television receiver.

Adjustable loop and dipole antenna

Impedance adjusting elements for a microstrip circuit of the kind employing a signal transmission line connected to an active circuit element and impedance matching elements, such as parallel-connected open-ended stubs, are formed of one or more wire elements arranged in proximity to the transmission line and the open-ended stub and connected at one end to the ground plane on the side of the substrate opposite the transmission line, wherein the free end of the wire elements can be freely moved, thereby adjusting the spacing of the wire elements from the respective signal path and open-ended stub and adjusting the angle of intersection of the wire elements and the respective signal path and open-ended stub, so that the effective impedances of the circuit can be controlled.

Impedance adjusting element for a microstrip circuit

PURPOSE:To simplify the switching of polarized waves, by picking up each of orthogonal polarized component, respectively and outputting either one of left or right rotary circular polarized wave electromagnetic waves through the change of one polarized component to the phase of another polarized component relatively by pi/2. CONSTITUTION:A circular polarized wave is inputted from one end of a circular waveguide 6, and polarized wave components E1 and E2 orthogonal to the inputted circular polarized waze are picked up from an output pickup section at the end. The polarized wave component E1 is directly inputted to a synthesizer 8 from the waveguide 6 and other polarized component E2 is applied to a + or -pi/2 phase modulator 7 and the phase is changed and applied to the synthesizer 8 by +pi/2 or -pi/2 with a control signal corresponding to the direction of polarized plane. The polarized components E1 and E2 from the waveguide 6 are applied to a Y-shaped directional coupling circuit 17 via a pi/2 phase shifter 16 with a microstrip line mounted on the insulation plate and applied to the circuit 17 via pi/2 phase modulator in which the polarized component E2 can be on/off controlled with an electrode 22 with microstrip lines 18 and 20 to simply switch the direction of the circular polarized electromagnetic waves.

Shinobu Tsurumaru

Papers

Super high frequency receiver

Microwave antenna structure with intergral radome and rear cover

Adjustable loop and dipole antenna

Impedance adjusting element for a microstrip circuit

Receiver for circular polarized electromagnetic wave