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1806 results about "High isolation" patented technology
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Porous molecular-sieve catalyst for assembling carbide and its preparation
InactiveCN1895777AImprove performanceImprove stabilityMolecular sieve catalystsMolecular sieveActive component
A meso-porous molecular sieve catalyst with carbide features that the carbide particles are assembled in the pores of meso-porous molecular sieve, resulting in high isolation and dispersion of active component particles and in turn high stability and activity.
Owner:BEIJING UNIV OF CHEM TECH
Integrated, closely spaced, high isolation, printed dipoles
ActiveUS20060262026A1Improve antenna isolationReduce electromagnetic couplingSimultaneous aerial operationsRadiating elements structural formsTransceiverNon symmetric
An antenna configuration includes two closely spaced antennas each positioned so as to be orthogonally polarized with respect to the other. The antenna configuration increases antenna isolation and reduces electromagnetic coupling between donor side antenna and repeat side antenna. The antennas include printed dipoles connected to respective transceivers through respective baluns to balance the non-symmetrical portions of the antenna feed paths to reduce unwanted radiation therein. Printed features such as chokes and non-symmetrical and non-parallel structures are preferably included in the ground plane of a multi-layer circuit board to reduce or eliminate circulating ground currents.
Owner:QUALCOMM INC
Low frequency dual-antenna diversity system
ActiveUS20110298669A1Simultaneous aerial operationsAntenna supports/mountingsElectricityDielectric substrate
A dual-antenna diversity antenna system that operates within a low frequency band range is disclosed. Two antennas are folded separately onto a single three dimensional dielectric substrate in a meander pattern configuration. Each antenna has an independent feed port and ground pin. The two antennas are configured within a compact mobile terminal to produce high isolation and low correlation at resonating frequencies within the 700 Megahertz frequency band.
Owner:MALIKIE INNOVATIONS LTD
High-isolation slot antenna array
ActiveCN104124527AImprove isolationReduce radiationPolarised antenna unit combinationsAntenna couplingsMulti inputDielectric substrate
A high-isolation slot antenna array relates to a multi-input multi-output antenna. The antenna is composed of three slot antennas which are arranged together, the radiation polarization directions of every two slot antennas intersect, and each slot antenna is formed by a micro-strip feeder on a dielectric substrate and a metal ground plane. A radiation slit and a plurality of isolation slots are formed in the metal ground plane. The isolation slots are formed in the periphery of the radiation slit, and the isolation slots are parallel to each other. The long side direction of the radiation slit is perpendicular to the long side direction of the isolation slots, and the length of the isolation slots enables the resonance frequency to be lower than the working efficiency of the antennas. An antenna input output port is formed in one end of the micro-strip feeder, a metal short circuit needle is arranged at the tail end of a micro-strip feeder conduction band at the other end of the micro-strip feeder, and the conduction band and the metal ground plane are connected on the edge of the radiation slit through the metal short circuit needle. The antenna can effectively reduce adverse effects of shielding and isolation of the metal ground plane on antenna normal radiation.
Owner:ZHONGTIAN BROADBAND TECH +1
Low frequency diversity antenna system
ActiveUS20110215971A1Simultaneous aerial operationsAntenna supports/mountingsLow frequency bandHigh isolation
A diversity antenna system that operates within a low frequency band ranging from 700 Megahertz is disclosed. A plurality of antennas are folded onto a single printed circuit in a meander pattern configuration. Each antenna has an independent feed port and ground pin. The plurality of antennas are configured within a compact mobile phone space to produce a high isolation and low correlation at resonating frequencies within the 700 Megahertz frequency band.
Owner:BLACKBERRY LTD
Wide-band annular dual polarized radiating element and linear array antenna
ActiveCN101425626AImprove efficiencyImprove isolationSimultaneous aerial operationsIndividually energised antenna arraysBroadbandHigh isolation
The invention discloses a broadband annular dual-polarization radiation unit and a linear array antenna applying the radiation unit. The radiation unit is used to be installed on a metal reflecting board to form a communication antenna and comprises the following parts: two pairs of orthogonal polarization dipoles used for transmitting or receiving communication signals, and balancers corresponding to the dipoles for performing balanced feeding to each dipole; each dipole comprises two unit arms which are symmetrically and fixedly arranged on the balancer, and show symmetrical lines with the balancers. One end of each unit arm is fixedly arranged on the balancer, and the other end of each unit arm is provided with a vertically downward loaded line and evenly provided with tuning branches with the size of the cross section being different from that of the cross section of the unit arm. The broadband annular dual-polarization radiation unit has the advantages of wide bandwidth, high efficiency, high isolation, high cross polarization discrimination, and small discreteness of the beam width with the variation of frequency, and the like, can be used as a separate antenna, and more used as an array group unit of the array antenna.
Owner:COMBA TELECOM TECH (GUANGZHOU) CO LTD +1
Aligned duplex antennae with high isolation
InactiveUS20070057860A1Improve isolationReduce signal lossRadiating element housingsIndependent non-interacting antenna combinationsEngineeringHigh isolation
Integrating dual antennae into a single rigid assembly guarantees parallel alignment between the antennae and provides higher isolation with lower insertion loss than duplexing methods can achieve through a single antenna. The resulting higher performance at lower cost can benefit two-way communication systems using time division duplexing, frequency division duplexing, or polarization division duplexing; or combinations of these methods.
Owner:RADIOLINK NETWORKS
Shielded through-via
InactiveUS20070222021A1Minimize the effect of parasitic capacitanceImprove isolationSemiconductor/solid-state device detailsPrinted circuit aspectsParasitic capacitanceEngineering
A shielded through-via that reduces the effect of parasitic capacitance between the through-via and surrounding wafer while providing high isolation from neighboring signals. A shield electrode is formed in the insulating region and spaced apart from the through-via. A coupling element couples at least the time-varying portion of the signal carried on the through-via to the shield electrode. This reduces the effect of any parasitic capacitance between the through-via and the shield electrode, hence the surrounding wafer.
Owner:TELEDYNE SCI & IMAGING
Antenna switch
InactiveUS20050079829A1Configuration of antenna complicatedReduced insertion lossRadio transmissionWaveguide type devicesEngineeringHigh isolation
An antenna switch having a simple configuration and realizing high isolation between transmitting and receiving is provided. The antenna switch has a first switch connected between a transmitting terminal 31 and an antenna terminal 4, a transmission circuit 9 whose one end is connected to the antenna terminal and which shifts a phase of a transmitting signal by 90 degrees at use frequency, a second switch 6 whose one end is connected to the other end of the transmission circuit 9 and whose other end is grounded, and a plurality of third switches 7, 8 connected between the other end of the transmission circuit 9 and the plurality of receiving terminals 32, 33.
Owner:RENESAS TECH CORP
High-isolation semi-groove slot antenna array
ActiveCN104134871AImprove isolationReduce volumeAntenna arraysRadiating elements structural formsConduction bandHigh isolation
The invention discloses a high-isolation semi-groove slot antenna array, and relates to a multiple-input-multiple-output antenna. The antenna array consists of three semi-groove slot antennas which are placed together and are pairwise orthogonal in radiating polarization directions, wherein each semi-groove slot antenna consists of a microstrip feeder line on a medium substrate, and a metal ground surface; a radiating semi-groove slot and a plurality of isolation slots are formed in each metal ground surface; the radiating semi-groove slots are rectangular; one end of each radiating semi-groove slot is short-circuit; the other end of each radiating semi-groove slot is open-circuit; the isolation slots around the radiating semi-groove slots are mutually parallel; long side directions of the radiating semi-groove slots are perpendicular to long side directions of the isolation slots; the resonant frequency of the isolation slot is lower than the working frequency of the antennas; one end of each microstrip feeder line is an input-output port of each antenna; and metal short-circuit pins are arranged at the tail ends of microstrip feeder line conduction bands at the other ends of the microstrip feeder lines, and connect the conduction bands and the metal ground surfaces on the edges of the radiating semi-groove slots. The antenna array can effectively reduce adverse effects of the metal ground surfaces on shielding and isolation of normal radiation of the antennas.
Owner:ZHONGTIAN BROADBAND TECH +1
Dual-polarized vibrator unit, antenna and multi-frequency antenna array
ActiveCN105896071AAchieve resonanceImprove front-to-back ratioParticular array feeding systemsRadiating elements structural formsDielectric substrateDipole antenna
The invention provides a dual-polarized vibrator unit, an antenna and a multi-frequency antenna array. The dual-polarized vibrator unit includes a radiator and a balun support portion for feeding of the radiator. The radiator includes a dielectric substrate, two pairs of dipole antenna arms being disposed on an upper surface of the dielectric substrate and in orthogonal arrangement of plus or minus 45 degrees, and at least one coupling metal strap disposed on a lower surface of the dielectric substrate. Current induction is generated between the dipole antenna arms and the coupling metal strap so that a current path is formed on the coupling metal strap. The vibrator unit and the antenna thereof in the invention can achieve the ultra-broadband, high gain, high efficiency, high cross polarization ratio and high front-ratio, high isolation, low profile and low coupling and is simple and beautiful in structure, easy in engineering realization and suitable for mass production, the production cost is reduced, and the electrical performance index meets the base station antenna industry standard.
Owner:SHANGHAI AMPHENOL AIRWAVE COMM ELECTRONICS CO LTD
Antenna device and electronic device
ActiveCN107039766AGuaranteed Closed Radiation PathsHigh Isolation FeaturesSimultaneous aerial operationsAntenna supports/mountingsCarrier signalHigh isolation
The present invention discloses an antenna device and an electronic device. The antenna device comprises a metal housing with a slit structure, wherein the metal housing is divided into an antenna arm portion and a main area portion; the antenna arm portion comprises a first fracture and a second fracture, and the antenna arm portion is at least divided by the first fracture and the second fracture into: a first antenna arm located between the first fracture and the second fracture, the first antenna arm being separating from the main area portion, a second antenna arm located at the first side of the first antenna arm, the first end and the second end of the second antenna arm being connected with the main area portion, a first matching circuit, one end of the first matching circuit being connected with the first antenna arm through a first metal connection piece, the other end of the first matching circuit being earthed at least through a first feed source; and a second matching circuit, one end of the second matching circuit being connected with the second antenna arm through a second metal connection piece, and the other end thereof being earthed through a second feed source. The antenna device and the electronic device is low in contour and high isolation, satisfy carrier aggregation, and facilitate improving antenna radiation efficiency and partial space multi-antenna design.
Owner:VIVO MOBILE COMM CO LTD
Device and methods for high isolation and interference suppression switch-filter
ActiveUS20060281418A1Shorter electrical couplingSmall footprintMagnetic/electric field screeningFixed capacitorsRadio equipmentOut of band rejection
Systems and methods are provided for a stacked die configuration of a high isolation switch and a rejection filter where transmit and receive signals are desired to have a high out-of-band rejection and a low loss band-pass region. In some aspects of the invention the high isolation switch is a double pole double throw switch modified to operate as a high isolation single pole double throw (SPDT) switch. In some aspects of the invention the high isolation switch is a conventional high isolation SPDT switch. The switch is mounted on a low profile rejection filter having metallization on a portion of an outer surface of the rejection filter. The metallization on the outer surface of the rejection filter provides an AC ground layer in close proximity to the switch that provides a short coupling path between the switch and the AC ground. The resulting switch-filter component also results in a smaller footprint than if the two devices were mounted individually and / or adjacently. The switch-filter component has applications in devices requiring high isolation between transmit and receive paths, for example use within a front-end module (FEM) of a single antenna, multi-radio device.
Owner:SIGE SEMICON
Fiber-optic matrix switch using phased array acousto-optic device
InactiveUS6922498B2Reduce coupling strengthEffective interactionCoupling light guidesNon-linear opticsFiberFiber array
A high-speed high-isolation fiber-optic matrix switch using only one acousto-optic device with phased array transducers is disclosed. Previously disclosed fiber-optic switches either required spatially separated more than one acousto-optic devices making them complex, hard to align and expensive or could not achieve high-isolation and low-insertion loss performance. A simple structure of 2×2 fiber-optic matrix switch with one phased array transducer as disclosed here is expected to make acousto-optic based fiber-optic switches more attractive than similar MEMs based switches. Use of shared lens instead of individual lenses at the input and output fiber array is expected to further reduce complexity and cost of the acousto-optic based fiber-optic switches.
Owner:MVM ELECTRONICS
Shielded through-via
InactiveUS7589390B2Minimize the effect of parasitic capacitanceImprove isolationSemiconductor/solid-state device detailsPrinted circuit aspectsParasitic capacitanceEngineering
Owner:TELEDYNE SCI & IMAGING
Co-channel full-duplex system based on MPPSK modulation
ActiveCN103957182AEasy to implementLow costPhase-modulated carrier systemsTransmitter/receiver shaping networksBandpass filteringSelf interference
The invention discloses a co-channel full-duplex system based on MPPSK modulation. After the system isolates receiving and sending signals at the radio-frequency head normally, cancellation conducted on leakage self-interference signals is finished on a digital baseband; the cancellation method is conducted after conducting shock filter on MPPSK receiving and sending aliasing signals, extracting and multiplying by coherent carrier, band-pass filtering and digitizing, the result of initial channels of all self-interference channels between the output end of a modulator and a receiver ADC is estimated before formal communication, self-interference offset signals are rebuilt by the adoption of the estimated result, further residual errors are filtered out with the combination of methods of coding rate filtering and double matched filtering of a method of shock filtering-multiplying by the coherent carrier-band-pass filtering-coherent demodulation, and MPPSK receiving signals are demodulated reliably. The co-channel full-duplex system based on MPPSK modulation is free of radio-frequency self-interference cancellation, has low requirements for the dynamic range and sampling rate of the ADC, has high isolation degree for the self-interference signals, and is simple in structure, low in complexity, high in spectrum efficiency and good in demodulation performance.
Owner:苏州东奇信息科技股份有限公司
Tunable add/drop optical filter
InactiveUSRE37044E1Improve isolationMultiplex system selection arrangementsWavelength-division multiplex systemsGratingLow voltage
In all-optical networks, optical switching and routing become the most important issues for interconnecting the transport network layers. This invention describes a novel tunable optical add / drop filter for the all-optical wavelength-division-multiplexing (WDM) network applications. This filter can add or drop part of the high transmission capacity signals of a WDM link. It can be used to decentralized access point in the access network or as small core network node to realizing branching points in the network topology. It works in both wavelength and space domains. It has the advantages of: 1) High throughput and low voltage operation; 2) Wide tuning range and therefore, high channel capacity; 3) High isolation and high directivity between input and output ports; 4) Compact device packaging is possible as compares to the conventional grating and mechanical switching type of add / drop filter; 5) Multiple ports add / drop tunable filters can be realized with this invention to interconnect multiple WDM networks. This novel add / drop filter can be used in various WDM topologies. It enhances the performance of the conventional tunable filter by re-routing the rejected wavelengths back to network, which not only save the precious optical energy, but also cut down the return loss of the device.
Owner:EZCONN
Antenna array and communication method used for full duplex communication
In order to solve the disadvantages of the existing full duplex communication, the invention provides an antenna array and a communication method used for the full duplex communication. The antenna array comprises a first sub array with a plurality of first antenna elements and a second sub array with a plurality of second antenna elements. At the same time, one in the two sub arrays is used for sending a signal, the other one is used for receiving a signal, and thus the full duplex communication is carried out, wherein the first sub array and the second sub array are separated, and the polarization direction of the first antenna elements of the first sub array is orthogonal to the polarization direction of the second antenna elements of the second sub array. The antenna array has a high isolation degree between full duplex receiving and sending, and the self interference of full duplex receiving and sending is reduced.
Owner:ALCATEL LUCENT SHANGHAI BELL CO LTD
Narrow reactive edge treatments and method for fabrication
InactiveUS6933895B2Improve isolationNone is suitable for purposeSimultaneous aerial operationsAntenna supports/mountingsUltrasound attenuationManufacturing technology
An electromagnetic bandgap material is electrically attached to an edge, and enables high isolation between antennas due to the attenuation of surface waves. The disclosed embodiments further provide narrow reactive edge treatments in the form of artificial magnetic conductors (AMCs) whose physical width is less than 1 / 10 of a free space wavelength for the frequency of surface currents intended to be suppressed. These embodiments still further provide several AMCs suitable for this purpose, along with several exemplary manufacturing techniques for the AMCs.
Owner:E TENNA CORP
High-isolation transmit/receive switch on CMOS for millimeter-wave applications
A CMOS monolithic transmit / receive switch comprises a single pole double throw switch (SPDT) module operable to selectively connect an antenna port to either a transmit port or to a receive port. A transmit matching network comprising a first transmission line matches the impedance of the transmit port of the SPDT module to a transmit impedance, and a first shunt transistor is operable to selectively ground a transmitter end of the first transmission line. A receive matching network comprising a second transmission line matches the impedance of the receive port of the SPDT module to a receive impedance, and a second shunt transistor is operable to selectively ground a receiver end of the second transmission line.
Owner:ADVANCED MICRO DEVICES INC +1
High power shunt switch with high isolation and ease of assembly
ActiveUS7439610B2Semiconductor/solid-state device detailsSolid-state devicesEngineeringHigh isolation
Owner:MACOM TECH SOLUTIONS HLDG INC
Low-profile dual-polarization dipole base station antenna loaded with AMC reflecting plate
InactiveCN106785405AEasy to expandImprove isolationRadiating elements structural formsAntennas earthing switches associationCoaxial lineHigh isolation
The invention discloses a low-profile dual-polarization dipole base station antenna loaded with an AMC reflecting plate. The antenna comprises a dual-polarization planar dipole antenna, four plastic support columns and the AMC reflecting plate. The dual-polarization planar dipole antenna comprises coupling microstrip lines, an upper dielectric plate, a radiating structure and coaxial lines from top to bottom in sequence; the AMC reflecting plate comprises a rectangular patch, a lower dielectric plate, an air dielectric, metal support columns and a metal plate which are periodically arranged from top to bottom in sequence, the coupling microstrip lines and the radiating structure are located on the upper side and the lower side of the upper dielectric plate in the same placing direction, and + / -45-degree dual-polarization is achieved in a coaxial line feeding mode. The dual-polarization planar dipole antenna is fixed to the AMC reflecting plate through the plastic support columns. Accordingly, the AMC reflecting plate is adopted for replacing an original metal reflecting plate, the antenna profile height is lowered to 0.132 lambda 2.2 GHz from 0.264 lambda 2.2 GHz, and meanwhile the advantages of being wide in frequency band, high in isolation, low in cross polarization, low in cost and the like are reserved. The application requirement of the current communication industry is met, and the low-profile dual-polarization dipole base station antenna conforms to the development trend of miniaturization of current base station antennae and has practical reference value.
Owner:CHONGQING UNIV OF POSTS & TELECOMM
High-different frequency isolation broadband double-frequency base station antenna array
ActiveCN107134639AReduce volumeRealize regulationParticular array feeding systemsSimultaneous aerial operationsCapacitanceBase station antenna array
Owner:SOUTH CHINA UNIV OF TECH +1
Semiconductor switching circuit for switching the paths of a high frequency signal in a mobile communications unit
InactiveUS7221207B2Reduce in quantitySimple circuit configurationMultiple-port networksElectronic switchingShunt DeviceCommunication unit
Owner:COLLABO INNOVATIONS INC
High isolation KVM switch
InactiveUS20050044266A1Good electrical isolationHigh level of electrical isolationMultiplex system selection arrangementsDigital computer detailsDisplay deviceEngineering
A switching system between channels from connected computers, the system comprising a signal path for each channel extending from each connected computer to a user's input and display devices, each signal path being substantially shielded and comprising a filter, a series switch connected to a resistor, and at least one shunt switch connected to a ground; and a channel selector switch receiving all of the signal paths; wherein the user selects a channel and a corresponding signal from the selected channel travels in the corresponding signal path through the filter, the series switch, and the channel selector, and wherein the signals of an unselected channel pass through the filter in the corresponding signal path to the resistor of the series switch, the signal passes through the at least one shunt switch to the ground, and the signal path of the unselected channel terminates at the channel selector.
Owner:DIGITALNET GOVERNMENT SOLUTIONS
Broadband dual-polarized omnidirectional ceiling antenna
InactiveCN102709673AImprove isolationImprove VSWRElectrically conductive connectionsRadiating elements structural formsDielectric plateHigh isolation
The invention discloses a broadband dual-polarized omnidirectional ceiling antenna, which comprises a round bottom plate, an antenna cover, a vertically-polarized antenna and a horizontally-polarized antenna, wherein the bottom plate and the antenna cover are assembled to cover the vertically-polarized antenna and the horizontally-polarized antenna; the vertically-polarized antenna comprises a round vertically-polarized metal plate provided with a through hole at the middle part, a metal support seat fixed in the through hole and having a lead hole, and a radiation oscillator vertically arranged on the metal support seat; the horizontally-polarized antenna is arranged on a round horizontally-polarized dielectric plate; the horizontally-polarized dielectric plate is above the bottom plate; and the vertically-polarized metal plate is above the horizontally-polarized dielectric plate, and a plurality of supporting columns pass through the horizontal dielectric plate and respectively fix and support the vertically-polarized metal plate and the bottom plate. The antenna manufactured according to the invention has strong environment applicability, low standing-wave ratio, high isolation degree, excellent antenna performance and a simple and compact structure.
Owner:COMBA TELECOM SYST CHINA LTD +1
Compact multi-beam antenna array with high and low frequencies of filtering oscillators in interlacing arrangement
PendingCN106410396AWith filtering characteristicsReduce mutual couplingParticular array feeding systemsRadiating elements structural formsCouplingArray element
The invention discloses a compact multi-beam antenna array with high and low frequencies of filtering oscillators in interlacing arrangement. The antenna array comprises first and second subarrays arranged on a substrate, the first and second subarrays work in first and second frequency ranges respectively and are arranged in an interlacing manner, array elements of one subarray are distributed in spaces among array elements of the other subarray dispersely, the first subarray is formed by a first filtering antenna unit of at least one applied-loss-free circuit, and the second subarray is formed by a second filtering antenna unit of at least one applied-loss-free circuit. The whole array is formed by interlacing arrangement of oscillators in two frequency ranges, and compared with a design in which the high-frequency oscillators and low-frequency oscillators are arranged separately, the size can be reduced; and compared with design of interlacing oscillator array without a filtering characteristic, mutual coupling between the oscillators is lower, and a high isolation performance can be maintained.
Owner:SOUTH CHINA UNIV OF TECH
Antenna duplexer
ActiveUS20120188026A1Improve featuresLow insertion lossImpedence networksTransmissionUltrasound attenuationResonance
An antenna duplexer includes first and second filters connected to an antenna terminal. The first filter has a passband of a low frequency band. The second filter has a passband of a high frequency band. The second filter is a ladder-type filter including series-arm resonators and parallel-arm resonators. At least one parallel-arm resonator out of the parallel-arm resonators has a main resonance and an auxiliary resonance. Attenuation poles caused by the main resonance and the auxiliary resonance are within the low frequency band. This antenna duplexer has a high attenuation characteristic and a high isolation characteristic while maintaining a low insertion loss.
Owner:SKYWORKS PANASONIC FILTER SOLUTIONS JAPAN
Multiple antenna array with high isolation
ActiveUS7385563B2Improve isolationAntenna couplingsAntenna feed intermediatesSoftware engineeringGround plane
A high-isolation multiple in, multiple out (MIMO) antenna array includes, in one configuration, a ground plane, and a plurality of antenna transmitting / receiving elements arranged near the periphery of the ground plane, wherein each of the antenna transmitting / receiving elements is resonant at a frequency f. Also, the array includes an isolation antenna element located on the ground plane, between the plurality of antenna transmitting / receiving elements. The isolation antenna element is also resonant at the same frequency f. The plurality of antenna transmitting / receiving elements and the resonant isolation antenna element are arranged on the ground plane arranged so as to achieve substantially greater than 15 dB isolation of the antenna transmitting / receiving elements. In some configurations, at least about 30 dB of isolation of the antenna transmitting / receiving elements can be achieved.
Owner:TYCO ELECTRONICS LOGISTICS AG (CH)
High isolation multiband MIMO antenna system
InactiveUS20120139793A1Increase diversityMaximize throughputSimultaneous aerial operationsRadiating elements structural formsMulti bandMimo antenna
The high isolation multiband MIMO antenna system is a multi-band dual and quad antenna for multiple-input-multiple-output (MIMO) antenna systems. Element and ground plane geometries that can cover a wide range of frequency bands (780 MHz-5850 MHz) are based on the varying some simple geometrical lengths and widths of the elements and ground planes. The MIMO antenna systems can be used for next generation cellular and wireless MIMO communication systems. Several isolation enhancement schemes increase the isolation between adjacent antenna elements. Any combination of the isolation and MIMO antenna system geometries can be created to support different wireless system standards. The novel MIMO antenna systems are disposed within a dielectric substrate area of 50×100 mm2.
Owner:KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS
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