64results about How to "Low axle ratio" patented technology

The present invention relates to a vehicle mountable satellite antenna as defined in the claims which is operable while the vehicle is in motion. The satellite antenna of the present invention can be installed on top of (or embedded into) the roof of a vehicle. The antenna is capable of providing high gain and a narrow antenna beam for aiming at a satellite direction and enabling broadband communication to vehicle. The present invention provides a vehicle mounted satellite antenna which has low axial ratio, high efficiency and has low grating lobes gain. The vehicle mounted satellite antenna of the present invention provides two simultaneous polarization states. In one embodiment, the present invention provides a ridged waveguide instead of a conventional rectangular waveguide to alleviate the effects of grating lobes. The ridge waveguide provides a ridged section longitudinally between walls forming the waveguide. A plurality of radiating elements are formed in a radiating surface of the ridged waveguide.

The present invention relates to a vehicle mountable satellite antenna as defined in the claims which is operable while the vehicle is in motion. The satellite antenna of the present invention can be installed on top of (or embedded into) the roof of a vehicle. The antenna is capable of providing high gain and a narrow antenna beam for aiming at a satellite direction and enabling broadband communication to vehicle. The present invention provides a vehicle mounted satellite antenna which has low axial ratio, high efficiency and has low grating lobes gain. The vehicle mounted satellite antenna of the present invention provides two simultaneous polarization states. In one embodiment, the present invention provides a ridged waveguide instead of a conventional rectangular waveguide to alleviate the effects of grating lobes. The ridge waveguide provides a ridged section longitudinally between walls forming the waveguide. A plurality of radiating elements are formed in a radiating surface of the ridged waveguide.

The present invention relates to a vehicle mountable satellite antenna as defined in the claims which is operable while the vehicle is in motion. The satellite antenna of the present invention can be installed on top of (or embedded into) the roof of a vehicle. The antenna is capable of providing high gain and a narrow antenna beam for aiming at a satellite direction and enabling broadband communication to vehicle. The present invention provides a vehicle mounted satellite antenna which has low axial ratio, high efficiency and has low grating lobes gain. The vehicle mounted satellite antenna of the present invention provides two simultaneous polarization states. In one embodiment, an inverted L-shaped waveguide has a first wall extending vertically downward from a top surface. The top surface can include a ridge portion. The top surface includes a plurality of radiating elements for forming a radiating surface.

The present invention relates to a vehicle mountable satellite antenna as defined in the claims which is operable while the vehicle is in motion. The satellite antenna of the present invention can be installed on top of (or embedded into) the roof of a vehicle. The antenna is capable of providing high gain and a narrow antenna beam for aiming at a satellite direction and enabling broadband communication to vehicle. The present invention provides a vehicle mounted satellite antenna which has low axial ratio, high efficiency and has low grating lobes gain. The vehicle mounted satellite antenna of the present invention provides two simultaneous polarization states. In one embodiment, a hybrid mechanic and electronic steering approach provides a more reasonable cost and performance trade-off. The antenna aiming in the elevation direction is achieved via control of an electronic beamforming network. The antenna is mounted on a rotatable platform under mechanical steering and motion control for aiming the antenna in the azimuth direction. Such approach significantly reduces the complexity and increases the reliability of the mechanical design. The antenna height is compatible to the two-dimensional electronic steering phased-array antenna. Additionally, the number of the electronic processing elements required is considerably reduced from that of the conventional two-dimensional electronic steering phased-array antenna, thereby allowing for low cost and large volume commercial production. The present invention provides electronically generated left, right, up, and down beams for focusing the antenna beam toward the satellite while the vehicle is moving. All of the beams are simultaneously available for use in the motion beam tracking. This provides much faster response and less signal degradation.

The present invention relates to a vehicle mountable satellite antenna as defined in the claims which is operable while the vehicle is in motion. The satellite antenna of the present invention can be installed on top of (or embedded into) the roof of a vehicle. The antenna is capable of providing high gain and a narrow antenna beam for aiming at a satellite direction and enabling broadband communication to vehicle. The present invention provides a vehicle mounted satellite antenna which has low axial ratio, high efficiency and has low grating lobes gain. The vehicle mounted satellite antenna of the present invention provides two simultaneous polarization states.

A compact, agile polarization diversity, multiband antenna with integrated electronics for satellite communications antenna systems is disclosed. The antenna includes a feed assembly having integrated microwave electronics that are mechanically and electromagnetically coupled thereto in a distributed arrangement so that diverse polarization senses having a low axial ratio and electronic switching control is provided. The microwave electronics include a distributed transmitter that can include high-band and low-band transceivers. The high-band and low-band transceivers can include high-band and low-band transmitter and receiver pairs, respectively. The antenna presented enables the mechanical rotation of the orientation of the high-band transceiver for skew alignment while the low-band transceiver remains stationary relative to the antenna assembly. The low-band transmitter and receiver pair can include planar interfaces electromagnetically coupled to the feed assembly between a main reflector and subreflector via OMTs. The highly compact antenna system presented offers polarization performance previously achievable by only larger devices.

An antenna for receiving and / or transmitting circularly and / or linearly polarized RF signals includes a radiation element, a ground plane, a dielectric substrate, and a feed line. The radiation element is disposed on a pane of glass. The radiation element defines a slot having a first leg and a second leg forming the shape of a cross for generating the circular and / or linear polarization. The cross-shaped slot includes a center point. The ground plane is disposed substantially parallel to and spaced from the radiation element. The dielectric substrate is sandwiched between the radiation element and the ground plane. The feed line extends within the dielectric substrate and is electromagnetically coupled with the radiation element and the ground plane. The feed line terminates at a distal end short of the center point of the slot. That is, the feed line does not cross the center point. The antenna is compact in size and generally conformal to the pane of glass.

The invention discloses an anti-multipath-interference broadband low-axial-ratio global-navigation-satellite-system (GNSS) antenna comprising four rectangular radiating units, corresponding four triangular matching connection units, four via holes, a microstrip line power divider phase-shift network, a feed via hole, a dielectric substrate, a circular plate type floor, four via hole round units, a feed via hole round unit, and a metal cylinder. The four rectangular radiating units and the four triangular matching connection units form a centric symmetric structure and are arranged right above the dielectric substrate. The four via holes pass through the dielectric substrate to realize communication between the triangular matching connection units and the port of the microstrip line power divider phase-shift network. The microstrip line power divider phase-shift network is arranged at the back of the dielectric substrate. The feed via hole is used for connecting the microstrip line power divider phase-shift network with a conductor arranged inside a coaxial feeder. The circular plate type floor is arranged at the front side of the dielectric substrate and the edge of the circular plate type floor is connected with the metal cylinder. The anti-multipath-interference broadband low-axial-ratio GNSS antenna disclosed by the invention has characteristics of good anti-multipath-interference performance, broadband, low axial ration, wide beam, and small size and the like.

The invention relates to an antenna field, and discloses a polarization tracking device. The polarization tracking device comprises a first rotary structure and a second rotary structure; the first rotary structure comprises a first linear polarization layer and at least three circularly polarized layers; the first linear polarization layer is coaxially arranged beneath at least three circularly polarized layers, the grid direction of every circularly polarized layer is the same; the first linear polarization layer is a plane wire grating polarizer, the included angle between the grid direction of the plane wire grating polarizer and the grid direction of every circularly polarized layer is 45 degrees; the second rotating structure comprises a second linear polarization layer and an antenna radiation port; the second linear polarization layer is arranged at the upper part of the antenna radiation port at the gamma g / 2 space; the first rotating structure is coaxially arranged at the upper part of the second rotating structure, and relatively rotated by the same axial core. The polarization tracking device is simple in structure, low in loss, and able to accurately track the satellite polarization direction.

The invention relates to a multifrequency patch antenna device, comprising a patch antenna, a printed circuit board (PCB), a shielding case and a low-noise amplifying circuit, wherein the patch antenna further consists of a patch antenna, a multi-frequency band feed network, a multi-frequency band feed probe and at least four feedback points; the at least four feedback points form at least two groups of feed points; one end of each of the at least two feed points is connected with the patch antenna, and the other end thereof respectively passes through the PCB via the multi-frequency band feed probe to be connected with the multi-frequency band feed network; and a shielding case is connected with the PCB. The invention improves the stability of antenna phase center, lowers axial ratio, and enables the matching to be much simpler and the antenna to become more compact. The device in the invention can receive multipath carrier at the same time, thus eliminating interference on an ionized layer and improving measurement precision.