84 results about "Antenna spacing" patented technology

A sensor system having a sharply defined zone of active sensing comprising a compound antenna system comprising an antenna structure disposed in relation to a shield structure and spaced from the shield structure, the shield structure having an open aperture in front of the antenna structure in the direction of a lobe of sensitivity of the antenna structure. In various embodiments, the shield structure may be layered on the inside between the antenna and the shield structure with an RF absorbing material. The aperture may be formed in part by adjustable panels and the antenna spacing from the aperture may be adjustable by adjusting an antenna mounting position within the shield. The compound antenna system may be coupled to a receiver having a threshold response based on the compound antenna system response characteristic.

The invention is directed to a method and system for equalizing the signal losses over cable runs in a Distributed Antenna System (DAS). In a DAS, two or more antennae are connected to the system by cable runs that can vary widely in length. As a result, the signal loss over a given cable run can also vary widely which can impact the design and deployment of the DAS and reduce antenna spacing. In addition, for a broadband DAS that supports many frequency bands or ranges using a common antenna unit, the signal losses vary with respect to frequency further making it difficult to equalize the cable losses. According to one embodiment of the invention, the method and system provide for measuring and adjusting the signal losses of each cable run to be a predefined value. According to another embodiment of the invention, the DAS can include a hybrid passive-active antenna unit for use in a DAS which includes a frequency multiplexer that separates the signal into frequency bands or ranges that are connected to an antenna element associated with a particular frequency band or range. Where a single frequency band needs to be amplified (or attenuated), a single band amplification block (SBAB) can be inserted in the connection between the frequency multiplexer and the antenna element to amplify (or attenuate) the desired frequency band. Where more than one frequency band need to be amplified (or attenuated), a multiband amplification block (MBAB) can be inserted in the connection between the frequency multiplexer and the appropriate antenna element to amplify (or attenuate) the desired frequency bands.

An integrated MIMO antenna system is described wherein multiple antennas are fabricated on a single substrate. Antenna spacing and alignment is enhanced and controlled to a finer degree than with conventional discrete antenna fabrication techniques. Rotation of one or multiple antennas in relation to the other antennas in the system can be performed to within the accuracy of current photo-etching techniques. Metalized traces can be designed and etched on the single substrate and positioned between antenna elements to enhance inter-element isolation. The integrated MIMO antenna system can be fabricated on flexible printed circuit (FPC) material, or can be fabricated on rigid metallized substrate such as common FR4 materials. Portions of one or multiple antenna elements can be photo-etched on opposite sides of the substrate to provide an additional degree of freedom in terms of antenna placement, spacing, and rotation angle.

The present disclosure relates to a method to determine a formation property of a subsurface formation. A downhole logging tool having two or more tri-axial antennas is provided and used to obtain azimuthally sensitive data. Borehole correction is performed on the obtained data and a ZD-inversion is performed on the borehole corrected data for all antenna spacing groups. A formation indicator flag is determined and, depending on the determined formation indicator flag, a 1D-axial inversion and / or a 1D-radial inversion is performed over selected zones, or neither is performed. The best ZD-inversion results are selected and the 1D-axial inversion results and / or the 1D-radial inversion results, if any, are combined with the selected best ZD- inversion results to form a composite inversion result. The formation property of the subsurface formation is determined using the composite inversion result.

A method includes broadcasting, at a transmitter, messages comprising antenna configuration, antenna spacing and a number of antenna of the transmitter and reference signals; generating, at a receiver, a codebook comprising a plurality of antenna beams based on the broadcasted messages; receiving, at the receiver, the broadcasted reference signals; selecting, at the receiver, an antenna beam among the plurality of antenna beams within the codebook in dependence upon a predetermined performance criteria of a data communication system and in dependence upon the broadcasted reference signals; feedbacking to the transmitter, at the receiver, information comprising the antenna beam selected by the receiver; optimizing, at the transmitter, a beamforming process by utilizing the feedback information from the receiver; transmitting, at the transmitter, data signals by utilizing the optimized beamforming process; and receiving and processing, at the receiver, the data signals in dependence upon the selected antenna beams within the codebook.

The invention is directed to a method and system for equalizing the signal losses over cable runs in a Distributed Antenna System (DAS). In a DAS, two or more antennae are connected to the system by cable runs that can vary widely in length. As a result, the signal loss over a given cable run can also vary widely which can impact the design and deployment of the DAS and reduce antenna spacing. In addition, for a broadband DAS that supports many frequency bands or ranges using a common antenna unit, the signal losses vary with respect to frequency further making it difficult to equalize the cable losses. According to one embodiment of the invention, the method and system provide for measuring and adjusting the signal losses of each cable run to be a predefined value. According to another embodiment of the invention, the DAS can include a hybrid passive-active antenna unit which includes a frequency multiplexer that separates the signal into frequency bands or ranges that are connected to an antenna element associated with a particular frequency band or range. Where a single frequency band needs to be amplified (or attenuated), a single band amplification block (SBAB) can be inserted in the connection between the frequency multiplexer and the antenna element to amplify (or attenuate) the desired frequency band. Where more than one frequency band need to be amplified (or attenuated), a multiband amplification block (MBAB) can be inserted in the connection between the frequency multiplexer and the appropriate antenna element to amplify (or attenuate) the desired frequency bands.

In a MIMO communication system that includes a transmitter and a receiver and forms line-of-sight orthogonal channels between the transmitter-side transmitting antenna and the receiver-side receiving antenna, the MIMO communication system is provided between the transmitting antenna and the receiving antenna with an optimum antenna-to-antenna spacing shortening unit to shorten an optimum antenna-to-antenna spacing by changing the phase rotation of a carrier wave used for directly opposed waves between opposed antennas, and the phase rotation of a carrier wave used for intersecting waves between oblique antennas in such a manner that the amount by which one of the phase rotations changes is different from that by which the other phase rotation changes.

A millimeter-wave antenna device and a millimeter-wave antenna array device thereof are characterized in that bump portions on coaxial cable connector bases protrude into through holes of a millimeter-wave substrate to effectuate fixation thereof and ensure that the millimeter-wave substrate is tightly coupled to the coaxial cable connector bases to not only ensure the precision of the position of a feed impedance unit of a microstrip antenna structure but also ensure that, when fixed to an antenna back panel frame, a triangular configuration is effectuated such that larger antenna spacing (i.e., 8.5˜12 mm) is achieved while meeting the functional requirement of an antenna beam scan, that is, an allowance of ±30 degrees approximately, thereby circumventing a problem, i.e., the spacing between antenna units is too small to enable an external emitting / receiving module to function.

A compensated resistivity logging while drilling tool (100,12) having axially asymmetrically spaced transmitters (T1,T2,T3) is configured to provide compensated resistivity measurements. In one exemplary embodiment, the tool (100,120) includes first and second compensating transmitters (CT1,CT2), preferably deployed axially symmetrically between first and second spaced receivers (R1,R2). The tool (100,120) further includes a plurality of transmitters(T1,T2,T3) deployed axially asymmetrically with respect to the receivers (R1,R2), e.g., on one axial side of the receivers (R1,R2). The compensating transmitters (CT1,CT2) are configured to acquire a borehole compensation that may be subtracted from conventional phase and attenuation measurements.

An integrated MIMO antenna system is described wherein multiple antennas are fabricated on a single substrate. Antenna spacing and alignment is enhanced and controlled to a finer degree than with conventional discrete antenna fabrication techniques. Rotation of one or multiple antennas in relation to the other antennas in the system can be performed to within the accuracy of current photo-etching techniques. Metalized traces can be designed and etched on the single substrate and positioned between antenna elements to enhance inter-element isolation. The integrated MIMO antenna system can be fabricated on flexible printed circuit (FPC) material, or can be fabricated on rigid metallized substrate such as common FR4 materials. Portions of one or multiple antenna elements can be photo-etched on opposite sides of the substrate to provide an additional degree of freedom in terms of antenna placement, spacing, and rotation angle.

The elements of a phased array antenna are driven by different frequencies, rather than the same frequency, to realize a scanning beam. The scan rate of the beam may be set arbitrarily high according to the frequencies used to drive the phased array, without expensive phase modulators. In particular, each successive element of the phased array antenna is driven with a frequency that is offset from the frequency used to drive the previous element in direct proportion to the spacing between antenna elements. Thus, for a straight line implementation of a phased array antenna with an antenna spacing offset of λ / 2, the frequency offset between adjacent antenna elements is constant. For implementations of phased array antennas with another linear or a non-linear spatial relationship between antenna elements, the frequency offset between adjacent antenna elements is determined based on a linear or non-linear spatial relationship of the antenna.

The invention provides a positioning system and method based on single base station soft position information, and the system comprises a positioning base station which is used for receiving positioning data transmitted by a user terminal, and generating a positioning result based on the positioning data; the user terminal is used for sending positioning data to the positioning base station and receiving a positioning result; the positioning base station comprises an antenna array, a clock synchronization module, a measurement module, a soft position information extraction module, a communication module and a positioning module, and the user terminal comprises a wireless measurement module, a communication module and an inertial measurement unit. The soft position information extraction module is used for extracting soft position information from the measurement information related to the position of the user; and the positioning module is used for estimating the user position according to the soft position information and inertial data of the user terminal. According to the positioning system and the positioning method provided by the invention, the problem of phase ambiguity caused by the fact that the array antenna spacing is greater than the half-wavelength in single base station positioning can be effectively solved, so that the positioning precision can be remarkably improved by increasing the antenna array aperture.

A radar system and a method to configure the radar system involve one or more transmit antennas to transmit a radio frequency signal, and one or more receive antennas to receive reflected energy based on the radio frequency signal transmitted by the one or more transmit antennas. The one or more transmit antennas and the one or more receive antennas are arranged in an array. A processor jointly determines a spacing among the one or more transmit antennas and the one or more receive antennas arranged in the array and a mapping between data obtained by the one or more receive antennas and an angle of arrival of one or more targets detected in the data. Joint determination refers to both determination of the spacing being in consideration of the mapping and determination of the mapping being in consideration of the spacing.

The invention provides an antenna detection distance automatic test device which comprises a first horizontal translation device, a second horizontal translation device, a vertical moving device, a third horizontal translation device, a tag attitude adjusting device and a computer. A control board of each drive motor is connected with the computer. The computer is provided with a motor control module which is used for controlling the work of each drive motor, and a calculation module which is used for determining the position of a tag connecting component or a tag on the tag connecting component and the distance with an antenna according to the work of each drive motor. According to the invention, the test device can automatically control antenna and tag movement, antenna spacing, the height of the tag from the ground, the tag detection direction, and the position of the tag from the antenna; the computer can automatically calculate the height of the tag from the ground, the tag detection direction, and the position of the tag from the antenna; the test device can automatically carry out an antenna detection distance test; the antenna detection distance test is simple and easy; and the accuracy is improved.

A wireless communication system supporting improved performance in a sparse multi-path environment is provided that uses spatially reconfigurable arrays. The system includes a first device and a second device. The first device includes a plurality of antennas and a processor operably coupled to the plurality of antennas. The plurality of antennas are adapted to transmit a first signal toward a the second device and to receive a second signal from the second device. The processor is configured to determine an antenna spacing between the plurality of antennas based on an estimated number of spatial degrees of freedom and an estimated operating signal-to-noise ratio. The second device includes a receiver adapted to receive the first signal from the first device, a transmitter adapted to transmit the second signal toward the first device, and a processor. The processor estimates the number of spatial degrees of freedom and the operating signal-to-noise ratio from the received first signal.