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41 results about "Antenna input impedance" patented technology
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The input impedance of a Car Satellite TV Antenna. Definition: the ratio of the input signal voltage to the signal current in the car satellite TV antenna, which is called the input impedance of the satellite TV antenna. The input impedance has the resistance component Rin and the reactance component Xin, namely Zin = Rin + j Xin.
Dynamic real-time calibration for antenna matching in a radio frequency transmitter system
Real-time calibration of a tunable matching network that matches the dynamic impedance of an antenna in a radio frequency transmitter system. The radio frequency transmitter system includes two non-linear equations that may be solved to determine the reflection coefficient of the antenna. The tunable matching network is repeatedly perturbed and the power reflected by the antenna is measured after each perturbation at the same node within the tunable matching network. The power values are used by an optimizer in converging to a solution that provides input impedance of the antenna. The elements of the matching circuit are adjusted to match the input impedance of the antenna.
Owner:MALIKIE INNOVATIONS LTD
Dual-band antenna with an impedance transformer
InactiveUS20050200556A1Easily adjustEasy to adjustSimultaneous aerial operationsAntenna supports/mountingsImpedance transformerFrequency band
A dual-band antenna (1) for communication device includes a first radiating element portion (10) operating at a first frequency band, a second radiating element portion (20) operating at a second frequency band, an L-shaped ground portion (40), a conductive connection (50) interconnecting the first and second radiating element portions (10,20) with the ground portion (40) and a slot (101) served as an impedance transformer and positioned on the ground portion (40). The slot (101) is implemented as a capacitive load that eliminates the inductive part of the input impedance of the antenna, thereby the slot (101) can match the input impedance of the antenna with a feed line.
Owner:HON HAI PRECISION IND CO LTD
Coupled-fed antenna device
InactiveUS20070257842A1Simple designLow costSimultaneous aerial operationsAntenna supports/mountingsElectrical conductorCoupling
A coupled-fed antenna device comprising a substrate, a signal source, a ground plane, a radiation conductor, and a coupling feedline is disclosed. The substrate has at least a first surface and a second surface, and the signal source is disposed on the first surface. The ground plane is electrically grounded and covers at least partial area on the second surface of substrate. The radiation conductor is disposed on the second surface of substrate and connected to the ground plane. The coupling feedline consists of a first feedline connected to the signal source and a second feedline connected to the radiation conductor. The real part of the antenna input impedance may be adjusted by shifting the attachment point between the second feedline and radiation conductor. The first feedline and the second feedline are coupled together by a coupling element. The imaginary part of the antenna input impedance may be adjusted by changing the input impedance of an open stub of the coupling element.
Owner:AIPTEK INTERNATIONAL INC
Test system and method for accurately measuring dielectric constants
ActiveCN103913640AAccurate measurementEasy to processResistance/reactance/impedenceLow-pass filterRadio frequency signal
The invention relates to a test system for accurately measuring dielectric constants. The test system comprises an antenna part, a radio-frequency circuit part and a data processing and displaying part. The antenna part comprises a testing antenna and a scattering sample, the radio-frequency circuit part comprises a radio-frequency signal source and a radio-frequency circuit, and the radio-frequency circuit is composed of a directional coupler, a low noise amplifier, a power divider, a mixer and a low pass filter. The data processing and displaying part is composed of an amplifying circuit and an ARM development board. Electromagnetic parameters of the sample are accurately measured with changes of the input impedance of an antenna and a radiation field. The test system has the advantages that low dielectric constant materials and high dielectric constant materials can be accurately measured, errors are small, the testing system is simple, integration is convenient to achieve, the scattering sample is simple in shape and easy to machine, and sweep testing can be carried out on the scattering sample.
Owner:NANJING UNIV OF INFORMATION SCI & TECH
Near field communications reader
ActiveUS20130112747A1Low antenna input impedanceImprove performanceNear-field transmissionSimultaneous aerial operationsCapacitanceAudio power amplifier
The present application relates to a near field communications (NFC) reader which includes an amplifier that drives an antenna. Capacitors of fixed value are connected in series between differential outputs of the amplifier and inputs of the antenna and form a series resonant circuit with the impedance of the antenna. Variable capacitances are provided in series with the fixed value capacitors, and the capacitance of these variable capacitances can be adjusted to compensate for manufacturing tolerances in the fixed value capacitors which cause a frequency offset between a desired resonant frequency of the series resonant circuit its actual resonant frequency, and to compensate for changes in the input impedance of the antenna that occur as the distance between the antenna of the reader and an antenna of an NFC tag changes.
Owner:QUALCOMM TECH INT
Radio frequency transmitting circuit, bidirectional coupler and directional coupler
ActiveCN105743519AAdjust input impedanceSimple structureTransmitters monitoringBidirectional couplingImpedance matching
Owner:RDA MICROELECTRONICS SHANGHAICO LTD
Dynamic real-time calibration for antenna matching in a radio frequency transmitter system
Real-time calibration of a tunable matching network that matches the dynamic impedance of an antenna in a radio frequency transmitter system. The radio frequency transmitter system includes two non-linear equations that may be solved to determine the reflection coefficient of the antenna. The tunable matching network is repeatedly perturbed and the power reflected by the antenna is measured after each perturbation at the same node within the tunable matching network. The power values are used by an optimizer in converging to a solution that provides input impedance of the antenna. The elements of the matching circuit are adjusted to match the input impedance of the antenna.
Owner:MALIKIE INNOVATIONS LTD
Multi-band antenna apparatus disposed on a three-dimensional substrate, and associated methodology, for a radio device
ActiveUS20090051615A1Efficient transductionStable and relatively wide resonant frequency band characteristic and radiation patternSimultaneous aerial operationsAntenna supports/mountingsMulti bandDielectric
Antenna apparatus, and an associated methodology, for a multi-frequency-band-capable radio device, such as a quad-band mobile station. The antenna apparatus is formed from a three-dimensional rectilinear non-conductive dielectric antenna substrate, such as cube. An elongated radiation element is disposed over multiple surfaces of the antenna substrate. A T-shaped impedance matching element located at the end of the radiation element permits the antenna input impedance to be matched to a communications device. The length of the radiation element is selected to be substantially equal to a quarter wavelength of the lowest frequency band at which the antenna operates.
Owner:MALIKIE INNOVATIONS LTD
Multi-band antenna apparatus disposed on a three-dimensional substrate, and associated methodology, for a radio device
ActiveUS7714795B2Efficient transductionStable and relatively wide resonant frequency band characteristic and radiation patternSimultaneous aerial operationsAntenna supports/mountingsDielectricMulti band
Antenna apparatus, and an associated methodology, for a multi-frequency-band-capable radio device, such as a quad-band mobile station. The antenna apparatus is formed from a three-dimensional rectilinear non-conductive dielectric antenna substrate, such as cube. An elongated radiation element is disposed over multiple surfaces of the antenna substrate. A T-shaped impedance matching element located at the end of the radiation element permits the antenna input impedance to be matched to a communications device. The length of the radiation element is selected to be substantially equal to a quarter wavelength of the lowest frequency band at which the antenna operates.
Owner:MALIKIE INNOVATIONS LTD
Reduced size dielectric loaded spiral antenna
InactiveUS6975281B2Small sizeLower input impedanceSimultaneous aerial operationsAntenna supports/mountingsDielectric substrateReduced size
A spiral antenna having a pair of antenna arms mounted on a dielectric substrate. A balun is included to connect the antenna which has an impedance of 100 ohms to a 50 ohm cable. Unique features of the spiral antenna design provide for size reduction at a given lowest required frequency of operation. The spiral antenna has dielectric material layers positioned on both side of the antenna's metal arms. In addition, the antenna input impedance is reduced from the normal 100 ohm input impedance to approximately 50 ohms due the dielectric material.
Owner:THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE NAVY
Device and method for the improved directional estimation and decoding by means of secondary radar signals
ActiveCN101960327AGood estimateMulti-channel direction-finding systems using radio wavesRadio wave reradiation/reflectionBandpass filteringRadar systems
1. A device and a method for the improved directional estimation and decoding by means of secondary radar signals. 2.1 Radio-based positioning systems on the basis of secondary radar signals are known. For this purpose special receiver systems are utilized for estimating the direction, and special receiver systems are utilized for decoding secondary radar signals. In particular, a secondary radar system is absent, which, among others, takes into consideration any shortcomings of the hardware used, such as coupled antenna elements, different low-end impedances, deviating distances between the antenna elements, manufacturing and installation tolerances, and the like. 2.2 The device for directional estimation and / or decoding secondary radar signals according to the invention comprises the following: - at least one array A comprising M antenna elements AE - an amplifier LNA and bandpass filter F 1 combination connected to a plug-in connector S of the respective antenna element AE, at the filter output of said combination a first linear amplifier V 1 being connected for amplifying the band-limited signal, - a mixer M connected to the first linear amplifier V l for the frequency conversion into a ZF region, - a second linear amplifier V2 and bandpass filter F2 combination connected to the mixer output for amplifying and limiting the bandwidth of the signal in the ZF region, - a first analog-to-digital converter AD1 connected to the second bandpass filter F2 for scanning and quantifying the filter output signal. 2.3 The invention is within the field of secondary radar systems.
Owner:IAD GESELLSCHAFT FUER INFORMATIK AUTOMATISIERUNG & DATENVERARBEITUNG MBH
Sleeve monopole antenna with spatially variable dielectric loading
ActiveUS20180138599A1Improving Impedance MatchingLess energyWaveguide mouthsSimultaneous aerial operationsDielectricImpedance transformer
A dielectric loaded sleeve monopole antenna has a dielectric loading within the sleeve enables stable impedance in a dynamic operating environment. The use of a dielectric filling in the sleeve portion of the antenna enables tight control of the input impedance over frequency establishing stable broadband operation in challenging operating environments. The effective dielectric constant inside the sleeve of the antenna is designed to exhibit spatial variability. As a result, the sleeve essentially acts as an impedance transformer enhancing control over the input impedance to the antenna. The spatial variability in the dielectric filling may be realized as arrangements of single or multiple dielectric materials machined to synthesize the desired effective dielectric properties.
Owner:AMPHENOL ANTENNA SOLUTIONS
Reduced size dielectric loaded spiral antenna
InactiveUS20050243013A1Reduce antenna sizeSmall sizeSimultaneous aerial operationsAntenna supports/mountingsDielectric substrateReduced size
A spiral antenna having a pair of antenna arms mounted on a dielectric substrate. A balun is included to connect the antenna which has an impedance of 100 ohms to a 50 ohm cable. Unique features of the spiral antenna design provide for size reduction at a given lowest required frequency of operation. The spiral antenna has dielectric material layers positioned on both side of the antenna's metal arms. In addition, the antenna input impedance is reduced from the normal 100 ohm input impedance to approximately 50 ohms due the dielectric material.
Owner:THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE NAVY
Antenna impedance matching method and device
A impedance matching method for antenna sets upper and lower metal plates at the feed part antenna with printing circuit board to form a capacity and to utilize the pure reactance property of the capacity to eliminate the reactance part of antenna input impedance as well as the change the size of capatitance of capacity by adjusting the relative areas of upper and lower metal plates or by changing material of the printing circuit board for realizing the regulation of impetance matching so that the impedance matching can be easily achieved although the input reactance of antenna has been changed. The device for this method is the capacity formed by the conductive material and the media loaded in between. The capacity is connected with the feed part of antenna in electricity.
Owner:FOXCONN (KUNSHAN) COMPUTER CONNECTOR CO LTD +1
Sleeve monopole antenna with spatially variable dielectric loading
InactiveUS20180261923A1Improving Impedance MatchingMoreAntenna supports/mountingsIndoor communication adaptationDielectricMulti band
A dielectric loaded sleeve monopole antenna has a dielectric loading within the sleeve enables stable impedance in a dynamic operating environment. The use of a dielectric filling in the sleeve portion of the antenna enables tight control of the input impedance over frequency establishing stable broadband operation in challenging operating environments. The effective dielectric constant inside the sleeve of the antenna is designed to exhibit spatial variability. As a result, the sleeve essentially acts as an impedance transformer enhancing control over the input impedance to the antenna. The spatial variability in the dielectric filling may be realized as arrangements of single or multiple dielectric materials machined to synthesize the desired effective dielectric properties. The antenna may also include the addition of filtering elements inserted into the sleeve to reduce interference for multi-band wireless communication systems.
Owner:AMPHENOL ANTENNA SOLUTIONS
Method for measuring antenna impedance on ultrahigh frequency radio frequency identification electronic tag
ActiveCN104297566AHigh measurement accuracyEasy to operateResistance/reactance/impedenceAntenna impedanceMeasurement device
The invention discloses a method for measuring antenna impedance on an ultrahigh frequency radio frequency identification electronic tag. The method mainly solves the problem of influence on measurement precision caused by precision of an impedance measurement device. The method comprises the implement steps of first, calibrating a vector network analyzer for measurement through an electronic calibration part; second, connecting the port of the vector network analyzer with a single-end SMA connector of a difference balun clamp through a measurement line; third, sequentially measuring input impedance values of the difference end of the difference balun clamp under the states of short circuit, open circuit and connection with 50-ohm resistance; fourth, measuring the input impedance value of the single-end SMA connector under the state that the difference end of the difference balun clamp is connected with a balancing antenna to be measured; fifth, performing calculation according to the above four measured parameters to obtain the input impedance of the radio frequency identification balancing antenna. By means of the method, the influence on the measurement result caused by precision of the measurement device is avoided. The method has the advantages of being simple and quick in operation and high in measurement precision and can be suitable for measuring the input impedance of the balancing antenna on the ultrahigh frequency radio frequency identification electronic tag in a large-batch mode.
Owner:XIDIAN UNIV
A wideband phased array antenna element and a radiation method thereof
ActiveCN109167162AHigh bandwidthSmall sizeRadiating elements structural formsLoop antennasImpedance matchingRadio frequency
The invention relates to a broadband phased array antenna unit and a radiation method thereof. The external radio frequency signal is fed into the broadband phased array antenna unit through a feedingcoaxial connector, and the fed external radio frequency signal forms two different current distributions on the cooperation of a ring radiator and a ring radiator, a matching branch and an additionalresonant branch respectively; the external radio frequency signal is fed into the broadband phased array antenna unit through a feeding coaxial connector. The current on the annular radiator resonates at high frequencies of the operating frequency, The loop radiator, the matching branch and the additional resonant branch form the resonant current at the low frequency, the two resonant points effectively increase the bandwidth of the antenna element, and the electromagnetic waves generated by the two resonant points are radiated into the free space by the wideband phased array antenna element;the loop radiator, the matching branch and the additional resonant branch form the resonant current at the low frequency. The impedance matching of wideband phased array antenna elements is realizedby changing the input impedance of wideband phased array antenna with matching branch and loop radiator. The invention can be widely applied to phased array antennas of mobile platforms such as satellite-borne, airborne, missile-borne and ground-based terminals.
Owner:XIAN INSTITUE OF SPACE RADIO TECH
Planar inverted F shaped antenna, and method for adjusting input impedance
InactiveCN1917283AReduce certification feesReduce complexityRadiating elements structural formsCoaxial cableAntenna impedance
The antenna unit includes antenna prepared from sheet metal, shell body, and coaxial cable. The antenna includes radiation sect, grounding sect, and impedance matching sect with impedance matching space. The coaxial cable includes inner core connected to the radiation sect, and braid conductor connected to the grounding sect. The antenna unit also includes metal foil located inside the impedance matching space. The metal foil connected to the impedance matching sect is in use for adjusting input impedance. The method for adjusting input impedance includes steps: (1) selecting antenna and shell utilized inside notebook computer; (2) sticking metal foil to certain area inside shell; thus, after antenna is assembled to shell, the said area is corresponding to the impedance matching space; (3) assembling antenna to shell to make metal foil contact to the impedance matching sect. Advantages are: without need of change dies for antenna, and reducing cost for authenticating antenna.
Owner:FOXCONN (KUNSHAN) COMPUTER CONNECTOR CO LTD +1
Multi-band antenna and mobile terminal
InactiveCN105655713AMeet the needs of various combinationsWide working frequency bandSimultaneous aerial operationsMulti bandAntenna input impedance
The invention provides a multi-band antenna and a mobile terminal. The multi-band antenna comprises an antenna body, matching circuits and a frequency demultiplexer, wherein each matching circuit comprises multiple matching subcircuits, one end of each matching subcircuit is connected with a ground wire feeding point or a signal feeding point of the antenna body, the other end of each matching subcircuit is respectively connected with input interfaces for corresponding frequency bands of the frequency demultiplexer, and the matching circuit is used for modulating antenna input impedance of the antenna body during operation in a corresponding frequency band; and the frequency demultiplexer is used for separating signals which are received or transmitted by the antenna body and at different frequencies. The multi-band antenna provided by the embodiments of the invention has the advantages that the frequency demultiplexer is arranged in the multi-band antenna and separates the signals which are received or transmitted by the antenna and at different frequencies, so that the signals at different frequencies pass through different matching circuits, the input impedance of the antenna is modulated, the antenna works in different frequency bands at the same time, and requirements of CA on multiple frequency bands and multiple combinations are met.
Owner:GUANGDONG OPPO MOBILE TELECOMM CORP LTD
Sleeve monopole antenna with spatially variable dielectric loading
InactiveUS20180138597A1Improving Impedance MatchingLess energyElongated active element feedMulti bandDielectric
A dielectric loaded sleeve monopole antenna has a dielectric loading within the sleeve enables stable impedance in a dynamic operating environment. The use of a dielectric filling in the sleeve portion of the antenna enables tight control of the input impedance over frequency establishing stable broadband operation in challenging operating environments. The effective dielectric constant inside the sleeve of the antenna is designed to exhibit spatial variability. As a result, the sleeve essentially acts as an impedance transformer enhancing control over the input impedance to the antenna. The spatial variability in the dielectric filling may be realized as arrangements of single or multiple dielectric materials machined to synthesize the desired effective dielectric properties. The antenna may also include the addition of filtering elements inserted into the sleeve to reduce interference for multi-band wireless communication systems.
Owner:AMPHENOL ANTENNA SOLUTIONS
Ultra wide band elliptical monopole cylinder conformal antenna
InactiveCN104701614ALow profileWith ultra-wideband performanceRadiating elements structural formsAntenna earthingsAxial ratioShortest distance
Owner:JINLIN MEDICAL COLLEGE
Method and apparatus for remotely determining antenna input impedance
ActiveUS10309998B2Easy to observeEliminate useTransmitters monitoringReceivers monitoringEngineeringAntenna input impedance
A system for remotely measuring antenna input impedance utilizing an automatic antenna tuner in which, for any tuner, the tuner input impedance may be established by the values of the components in the circuit at the time that the SWR is at a minimum, with these values being automatically available in terms of the components that are switched in to achieve low SWR. Once having established the input impedance to the tuner, the complex conjugate of the tuner input impedance yields the antenna input impedance, with antenna input impedance sensed at full power at a position remote from the antenna input.
Owner:JUE MARTIN F
Small-sized multi-frequency broadband deformation sleeve antenna used for mobile communication
PendingCN107302127ASimple structureChanging the Impedance CharacteristicsSimultaneous aerial operationsAntenna supports/mountingsRadiation bandwidthElectrical conductor
Disclose is a small-sized multi-frequency-band deformation sleeve antenna. The sleeve structure of the existing sleeve antenna is simplified into multiple column bodies uniformly arranged on a bottom plate; matching of antenna input impedance is realized by loading metal columns at the bottom; by virtue of such design, the same radiation characteristic as the conventional sleeve antenna is maintained while the processing difficulty of the antenna is greatly lowered; and in addition, the deformation sleeve antenna is also additionally provided with a spiral conductor structure, and corresponding electrical dimensions of the working frequency band of the antenna are provided by the spiral structure, so that the overall physical length of the deformation sleeve antenna is shortened. The invention further provides a high-frequency radiation structure which can be coupled with the deformation sleeve structure; by matching with the deformation sleeve structure, the radiation bandwidth of the antenna can be expanded effectively; and the deformation sleeve antenna provided by the invention is symmetrical in structure, simple and concise, convenient for product processing and realization, and convenient to install, so that the mechanical strength of the antenna body can be effectively improved.
Owner:张颖松
Transmitting antenna for improving degree of freedom and distance in magnetic resonance wireless power transmission
PendingCN113285533AImprove transmission efficiencySmall change in input impedanceBatteries circuit arrangementsRadiating elements structural formsMagnetic resonant couplingReceiver coil
The invention discloses a transmitting antenna for improving the degree of freedom and distance in magnetic resonance wireless power transmission. The transmitting antenna comprises an exciting coil and a transmitting resonance coil, the exciting coil is a planar multi-turn coil; the transmitting resonance coil is formed by connecting two planar multi-turn coils in series; and the exciting coil is used for feeding in electromagnetic energy and coupling the electromagnetic energy to the transmitting resonance coil, and the transmitting resonance coil couples the electromagnetic energy to the receiving coil through magnetic resonance. The transmission efficiency of the transmitting antenna is kept stable at different charging distances and high-distance inclination angles; and the transmitting antenna is of a broadband matching structure, when receiving is carried out at different positions in a transmitting antenna field, the input impedance change of the transmitting antenna is very small, and matching between the output impedance of the power amplifier and the input impedance of the transmitting antenna is ensured.
Owner:CHENGDU SPROUTING TECH CO LTD
Directional antenna with slide tuning unit
InactiveCN102881984AGood electricalImprove mechanical propertiesRadiating elements structural formsAntenna earthingsDirectional antennaEngineering
The invention discloses a directional antenna with a slide tuning unit. The directional antenna comprises a metal reflection floor (1) and a metal plate radiation unit (2) arranged on the metal reflection floor (1); the metal reflection floor (1) is a rectangular metal plate of which one end is turned into a right-angle side; one end of the metal plate radiation unit (2) is partially turned into a right-angle side, and the other end of the metal plate radiation unit (2) is provided with two symmetrical sloping sides; and on the turned bottom edge of the metal reflection floor, a sliding metal tuning unit (3) is arranged on lateral front of the metal radiation unit of the antenna, and by regulating the position of the metal tuning unit (3), an aim of widening the frequency band to tune input impedence property of the antenna is fulfilled. The antenna performance is convenient to tune, and the wide bandwidth can be effectively acquired; and the directional antenna is simple in structure, convenient to implement and low in cost and has high electrical and mechanical properties.
Owner:深圳市三极天线技术有限公司
A test system and method for accurately measuring dielectric constant
ActiveCN103913640BAccurate measurementEasy to processResistance/reactance/impedenceLow-pass filterRadio frequency signal
The invention relates to a test system for accurately measuring dielectric constants. The test system comprises an antenna part, a radio-frequency circuit part and a data processing and displaying part. The antenna part comprises a testing antenna and a scattering sample, the radio-frequency circuit part comprises a radio-frequency signal source and a radio-frequency circuit, and the radio-frequency circuit is composed of a directional coupler, a low noise amplifier, a power divider, a mixer and a low pass filter. The data processing and displaying part is composed of an amplifying circuit and an ARM development board. Electromagnetic parameters of the sample are accurately measured with changes of the input impedance of an antenna and a radiation field. The test system has the advantages that low dielectric constant materials and high dielectric constant materials can be accurately measured, errors are small, the testing system is simple, integration is convenient to achieve, the scattering sample is simple in shape and easy to machine, and sweep testing can be carried out on the scattering sample.
Owner:NANJING UNIV OF INFORMATION SCI & TECH
Full frequency band ultra wide band antenna circuit model
The invention discloses a full frequency band ultra wide band antenna circuit model. The full frequency band ultra wide band antenna circuit model includes N A type basic model units and M B type basic model units, which are connected in series. The total number K (K=N+M) of the basic model units is equal to the number of frequency domain impacts of an antenna radio frequency impedance parameter real part in a test frequency band; the number N of the A type basic model units is equal to the number of capacitive type polynomials in a polynomial acquired from vector fitting of Z parameters of all the frequency bands after the frequency band is divided; and the number M of the B type basic model units is equal to the number of inductance type polynomials in a polynomial acquired from vector fitting of a Z parameter (radio frequency impedance parameter) real part of all the frequency bands after the frequency band is divided. The full frequency band ultra wide band antenna circuit model can achieve high-precision simulation of antenna input impedance characteristics in a full frequency band ultra wide band condition. The invention also discloses a method for using measurement radio frequency impedance parameter to extract component parameter values of the full frequency band ultra wide band antenna model on the basis of the vector fitting method.
Owner:SOUTHEAST UNIV
Method and apparatus for remotely determining antenna input impedance
ActiveUS20180031621A1Easy to observeEliminate useTransmitters monitoringReceivers monitoringAntenna input impedanceAntenna tuner
A system for remotely measuring antenna input impedance utilizing an automatic antenna tuner in which for any tuner, the tuner input impedance may be established by the values of the components in the circuit at the time that the SWR is at a minimum, with these values being automatically available in terms of the components that are switched in to achieve low SWR. Once having established the input impedance to the tuner, the complex conjugate of the tuner input impedance yields the antenna input impedance, with antenna input impedance sensed at full power at a position remote from the antenna input.
Owner:JUE MARTIN F
Cavity-backed drum-shaped slot broadband antenna based on a substrate integrated waveguide
PendingCN113612028AImplement extensionsHigh frequencySlot antennasInterference (communication)Cavity resonance
The invention discloses a cavity-backed drum-shaped slot broadband antenna based on a substrate integrated waveguide, and belongs to the technical field of wireless communication. The antenna comprises two main parts, namely a substrate integrated waveguide cavity and a feed structure, a drum-shaped gap is etched on the metal surface of the cavity, and a group of circular metal through holes are embedded in the cavity. By adopting the drum-shaped special gap and a group of interference through holes, the antenna simultaneously excites three cavity resonance modes in a substrate integrated waveguide cavity, so that the input impedance bandwidth of the antenna is expanded, the relative bandwidth reaches 22.9%, and the maximum gain in a working frequency band (8.9-11.19 GHz) is 6.48 dBi. In order to enable the antenna to be applied in a planar circuit structure, the antenna adopts a single-layer Rogers RT / Duroid 5880 substrate structure. The antenna has the characteristics of broadband, low manufacturing cost, easiness in integration with a planar circuit and the like, and is suitable for a broadband wireless communication environment.
Owner:CHINA JILIANG UNIV
A radio frequency transmitting circuit, bidirectional coupler and directional coupler
The invention discloses a radio frequency transmitting circuit, comprising a radio frequency transmitter, an antenna switch and an antenna. A bidirectional coupler and an antenna tuner are arranged between the antenna switch and the antenna. The bidirectional coupler comprises a directional coupler and a switch, and forward or reverse transmission power is detected by switching the switch. The directional coupler is provided with a plurality of connected coupling lines, which are respectively located at any one or more positions of the upper side, the lower side, the outer side and the inner side of a main signal line. The bidirectional coupler is both used for detecting the transmitting power and is used for detecting the reflected power and outputting a detection value to the radio frequency transmitter. The radio frequency transmitter is both used for calibrating the transmitting power and is used for adjusting the input impedance of the antenna to realize the impedance matching of the antenna. The invention further discloses a bidirectional coupler, which has the advantages of simple structure, small volume, low cost, and easy integration with the manufacturing process of integrated circuits. The invention further discloses a directional coupler, which has high coupling degree and low insertion loss.
Owner:RDA MICROELECTRONICS SHANGHAICO LTD
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