1155 results about "Standing wave ratio" patented technology

A system for transmitting power without wires or with no more than one connection, wherein communication is provided between an unlimited number of electronic devices, or to connect these devices to an unlimited number networks that are located externally to the system to thereby enable high speed voice and data communications over a single resonant connection At least one transmitter and one receiver are utilized, which may have the same or different configurations, such that an induced oscillating electπc current, which occurs at the resonant frequency of a transmitter, induces a standing wave The standing wave is tuned and “tapped” by a receiver having a coil or set of plates and receivers that are tuned to oscillate at the same frequency or one of its harmonics and, thus, absorb an electrical current and / or signals at the receiver

A high frequency coaxial cable having a foil (7a) between the cable insulator (5) and cable braid (7b), is terminated to a coaxial connector (40) in a manner that allows fast and easy cable preparation and results in a termination with minimal axial electric field lines that cause a high insertion loss and a high VSWR (voltage standing wave ratio). A bore (46) at the rear portion of the connector outer conductor, receives the cable insulator with foil around the cable insulator. The bore has a front part (54) that forms an interference fit around the foil, to avoid an axially-extending gap which might contain axially-extending field lines. The front of cable insulator and foil are flush and both abut the insulation (25) of the connector.

The invention discloses a circular polarized antenna with a wide wave beam width and a small size. The antenna comprises a square paster; two notch grooves of an open circuit of a terminal are arranged on the square paster, wherein the two notch grooves are mutually orthogonal; the paster is fixed on a square grounding reflecting surface by a coaxial line. And four short-circuit columns of the open circuit of the terminal are arranged on the reflecting surface, so that the size of the reflecting surface is reduced. According to the invention, a signal feeding technology is utilized to excite the two orthogonal notch grooves to work in a circular polarization mode. According to the invention, an impedance bandwidth reaches 19%, wherein a standing-wave ratio is less than 2; and a 3d axial ratio bandwidth reaches 3.8%. In an axial ratio bandwidth, a 3d B wave beam width reaches a value by adding 101.4 degrees with 1.4 degrees or subtracting the 1.4 degrees from the 101.4 degrees as well as a gain reaches a value by adding 5.76dBi with 0.18dBi or subtracting the 0.18dBi from the 5.76dBi. The circular polarized antenna has advantages of compact antenna dimension, light weight, low cost and easy manufacture. Especially, the circular polarized antenna has advantages of good impedance bandwidth, wide radiation wave beam, and high gain. Therefore, the circular polarized antenna can be widely applied to satellite communication and traffic navigation.

A method for adjusting a beam pattern in a beam pattern adjusting apparatus in a communication system supporting a Beam Division Multiple Access (BDMA) scheme is provided. The method includes determining whether a Voltage Standing Wave Ratio (VSWR) value for each antenna included in an antenna array included in the beam pattern adjusting apparatus is greater than or equal to a threshold VSWR value, if it is determined that an antenna of the antenna array has a VSWR value that is greater than or equal to the threshold VSWR, detecting whether each of the antenna elements is operable, and if it is determined that at least one of the antennas is inoperable, adjusting a beam pattern of at least one of the antennas that is operable.

An apparatus and method manage impedance values in a radio in a wireless network. The apparatus includes a tunable matching network (TMN) positioned on a path between a transceiver and an antenna. The TMN includes a plurality of immittance elements. A voltage standing wave ratio (VSWR) detector is configured to detect a ratio of a signal passing the VSWR detector and a signal reflected from the TMN. A control circuit is configured to identify an operating setting for the radio, set a number of the immittance elements based on the operating setting, monitor the ratio detected by the VSWR detector, and modify a setting of at least one of the immittance elements based on the ratio detected.

A protection method may prevent a load-mismatch-induced failure in solid-state power amplifiers. In an RF power amplifier, the load voltage standing-wave ratio results in very high voltage peaks at the collector of the final stage and may eventually lead to permanent failure of the power transistor due to avalanche breakdown. The method avoids breakdown by attenuating the input power to the final stage during overvoltage conditions, thus limiting the output collector swing. This is accomplished by a feedback control system, which detects the peak voltage at the output collector node and clamps its value to a given threshold by varying the circuit gain. Indeed, the control loop is unlocked in the nominal condition and it acts when an output mismatching condition is detected. A control circuit also allows a supply-independent collector-clamping threshold to be accurately set.

A transmitting and receiving antenna VSWRs (voltage standing wave ratio) measuring circuit of a base station in a mobile communication system comprises: transmitting and receiving antennas for transmitting and receiving a radio frequency signal of a predetermined frequency band in a mobile communication system; transmitting antenna VSWR measuring means for variable-attenuating and detecting a transmitting signal received from the transmitting antenna and sending a transmitting signal strength to a measuring controller whereby to measure transmitting power and reflected power; and receiving antenna VSWR measuring means for variable-attenuating and detecting a receiving signal received from the transmitting antenna and sending a receiving signal strength to a measuring controller whereby to measure receiving power and reflected power.

The invention relates to a detection method of standing-wave ratio of a time division duplex communication system, which comprises the following steps: a forward signal is sampled by switching a switch at a time interval of standing-wave ratio measurement; a reverse signal is sampled by switching the switch at the next time interval of standing-wave ratio measurement; the forward and the reverse signals is coupled and delivered to a digital-to-analog converter through a coupling passage, the delivered signal is sampled and quantized by using an AD sampler and processed by means of digital down-conversion to obtain a sampled data of baseband; a reflection coefficient |gamma_AD| is obtained by calculating, the transmission characteristic difference CF_R(Omega 0) between a forward detection channel and a reverse detection channel is obtained at the current frequency after table lookup process; and the standing-wave ratio VSWR is calculated based on the reflection coefficient |gamma_AD| and the transmission characteristic difference CF_R(Omega 0). Therefore, the invention realizes the multiplexing of a normal reception channel and the reverse and the forward standing-wave ratio channels, enables the normal reception channel to be used in standing-wave ratio detection, and ensures the equivalency of front / reverse power samplings by measuring the front and the reverse powers of the pilot frequency.

The invention discloses a broadband low cross-polarization printed dipole antenna with a parasitic element. The antenna has the advantages of broad frequency band, low cross-polarization, stable directional diagram, small size and simple structure. The antenna adopts a double-layer printed dipole way, and meanwhile, rectangular patches are uploaded on the upper end and at two sides of a dipole arm. The broadband low cross-polarization printed dipole antenna has the basic structure as follows: a metal earth plate, two layers of dielectric slabs, strip line feeding balun, a double-layer printed dipole arm, a rectangular patch arranged on the upper end of the dipole arm, rectangular patches arranged at two sides of the dipole arm and an SMA (Small A Type) joint. The greatest innovation of the broadband low cross-polarization printed dipole antenna is that the ultra broadband character and stable directional diagram character are obtained through uploading the parasitic elements in the manner of the rectangular patches on the upper end and at two sides of the double-layer printed dipole arm, 75% of bandwidth can be achieved under the condition that the standing-wave ratio is smaller than 1.5, and meanwhile, the broadband low cross-polarization printed dipole antenna has a stable directional diagram in the bandwidth, low cross-polarization and grain up to 6.1-9.3dBi. The size of the antenna is reasonably changed, i.e., other concrete embodiments of the invention can be formed.

Systems and methods are described for detachable antennas. A wireless communications device includes: a cam body defining a rotation axis, the cam body including a retaining zone having a snap-fit receptacle; a signal pin including a first signal pin end and a second signal pin end; an antenna conductively coupled to the first signal pin end; a signal clip with a protrusion, a contact pad with a recess, and a key pin that extends from the signal pin, the key pin having a first key pin end and a second key pin end, and being snap-fit into the snap-fit receptacle. The systems and methods provide advantages in that the detachable antenna is easily replaced without tools.

According to a reception passive intermodulation measurement method of the present invention, a device under test is set to the mismatching condition, and a standing wave is generated on a transmission line where the sample is connected. Since the tip of the transmission line is short-circuited using the sample, the sample is positioned at the anti-node of the standing wave, and test signals are applied at a high current density. System noise is calibrated with the tip of the transmission line being open. Since impedance matching is not required and terminators are not employed, a large measurement dynamic range is obtained without being affected by passive intermodulation that is generated in terminators. The sample is very small, and an arbitrary shape can be selected. The property measurement is enabled for a wide range of materials, regardless of a conductive material, an insulating material and a magnetic material.

The invention discloses a broadband dual polarized antenna unit, which comprises a radiator and a balanced feeding device, wherein the radiator consists of four radiation fins which are symmetric in pairs and are orthogonally distributed; the balanced feeding device consists of an excitation core wire and a balanced balun; the balanced balun is simultaneously formed into a support of each radiation fin; a symmetric radiation array is as long as a half of wavelength and is as wide as a quarter of the wavelength; each radiation fin further comprises a supporting area and a radiation area which are mutually adjacent; the two short sides and long sides of the radiation area and the two waists of the supporting area form a continuous curve; the ratio of the waist length of the supporting area to the length of the short side of the radiation area to the length of the long side of the radiation area is 1:1:2; and the two waists of each of the two adjacent radiation fins are arranged in parallel and are at an interval less than 0.1 wavelengths. The dual polarized antenna unit is a radiation oscillator which is relatively wider than the broadband and has good indexes, such as a standing-wave ratio and the like in a relatively wider bandwidth.

PCT No. PCT / JP96 / 00179 Sec. 371 Date Jul. 23, 1997 Sec. 102(e) Date Jul. 23, 1997 PCT Filed Jan. 31, 1996 PCT Pub. No. WO96 / 24177 PCT Pub. Date Aug. 8, 1996An insulator for high frequency connectors which comprises a thermoplastic norbornene resin and has a voltage and standing wave ratio of 1.89 or less even in the high frequency band of 2-3 GHz, and a high frequency connector using the insulator.

The invention provides a back-fed millimeter wave broadband double ridged horn antenna, belongs to the technical field of microwave and millimeter wave signal processing, and relates to a millimeter wave broadband horn antenna. The back-fed millimeter wave broadband double ridged horn antenna comprises a coaxial line excitation part, a ridge waveguide part and a double ridged horn part, wherein the coaxial line excitation part is formed by orderly connecting a coaxial line, a mode converting part and an impedance matching part; the mode converting part is formed by connecting a shielding panel line provided with a ridge and a coaxial line on the ridge side; the impedance matching part is stepped gradient double ridged waveguide; the ridge waveguide part is standard double ridged waveguide; and two ridges of the double ridged horn part are extended from two ridges of the ridge waveguide part to a mouth of a horn. The antenna adopts a back-fed structure, electromagnetic waves are fed in from the back of the ridge waveguide parallel to the ridge waveguide transmission direction, the coaxial line and the waveguide are positioned in the same axes, and a small voltage standing wave ratio can be obtained; and through mode conversion and impedance matching, the antenna can have satisfactory characteristics in a broadband range between 18 and 40GHz, and is characterized by wide frequency band, compact structure and good performance.

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.

The invention relates to a standing wave detecting system and a standing wave detecting system method for a radio frequency remote system, which fully use a hardware module of a DPD processing subsystem in the radio frequency remote system and count an average power by adopting a base band power statistic module, so that the precision of the standing wave detection is improved and the cost of the standing wave detection is reduced. The standing wave detecting system comprises a switch, a forward power feedback link, a backward power reading link, and a radio frequency feedback link, an analogue digital converter, a digital down-conversion module, the base band power statistic module and a monitoring subsystem, which are connected sequentially. The switch is connected with the forward power feedback link, the backward power reading link, and the radio frequency feedback link respectively; the base band power statistic module is used for performing statistic on the forward power feedback link and the backward power reading link and then computing the average power under the control of the monitoring subsystem; and the monitoring subsystem is used for computing a standing-wave ratio according to the average power.

The device includes testing circuit for antenna connection and comparator circuit for antenna inspection. The said testing circuit for antenna connection is in use for connecting to output port of the antenna in system of antenna and feed line, as well as picking up signal of testing antenna connection, and converting states of open circuit / short circuit of system of antenna and feed line into relevant output electrical signal in different numerical values. The comparator circuit for antenna inspection is in use for comparing the signal of testing antenna connection from the testing circuit with a given comparison threshold. When signal level of testing antenna connection is higher than the given threshold, high electrical level is output and alarm signal is sent out. The invention solves partially issues of complexity of antenna standing wave ratio detection method and poor real time of back power detection method. The invention also lowers cost and complexity.

An apparatus for measuring a voltage standing wave ratio of a base station. The apparatus comprises: a unit for measuring the voltage standing wave ratio of a transmitting terminal by coupling an input signal from the base station, and by comparing the difference of the coupled signal and a signal reflected from a transmitting antenna; and another unit for measuring the voltage standing wave ratio of a receiving terminal by comparing an input signal from a base-station test unit with the signal reflected from a receiving terminal.

This invention provides one standing wave ratio test method, which comprises the following steps: a, executing front power test and back test through switch on transmission line to get transmission line front power P and back power P; b, using current feedback channel gains to adjust P and P to get antenna front power and back power; c, using P and P to compute standing wave ratio VSWR. This invention also provides one stand wave ratio test device.

The invention relates to a standing wave detection method, a standing wave detection device and a base station. The standing wave detection method comprises the following steps of: transmitting a baseband multi-voice signal; receiving a feedback signal of the baseband multi-voice signal from a feedback channel; acquiring a time domain system transmission function by using the feedback signal and the baseband multi-voice signal; and acquiring a standing wave detection value according to the time domain system transmission function. By taking the baseband multi-voice signal as a transmitting signal used in a test, namely a baseband signal, receiving the feedback signal through the feedback channel and acquiring the time domain system transmission function by using the transmitting signal and the feedback signal, the standing-wave ratio and the cable fault point position are obtained by only increasing a little software algorithm but not increasing the hardware cost, and the standing wave detection and the breakpoint positioning of an antenna port cable are realized. Meanwhile, a plurality of conventional wireless products can realize the function through software update, and maintenance and detection personnel detects and positions faults without carrying heavy and expensive instruments, and performs standing wave detection without detaching cable joints.

The invention discloses a novel broadband printed dipole antenna with a branch wire integrated with a feed balun. The novel broadband printed dipole antenna comprises an SMA (Shape Memory Alloy) joint, a dielectric-slab, a radiating element and a microstrip line feed integrated balun, wherein the radiating element is provided with a slotting seam; dual radiation arms are formed on both sides of the slotting seam; the microstrip line feed integrated balun is provided with a branch wire; the branch wire is equivalent to a series resistor, and is used for improving the matched impedance. According to the novel broadband printed dipole antenna, the VSWR (Voltage Standing Wave Ratio) is less than or equal to 1.5, and the relative bandwidth is up to 58.7 percent (1.65-3.0GHz); compared with other bandwidth extension technologies (such as a parasitic patch increasing technology), the novel broadband printed dipole antenna has the advantages that design is made on the basis of not changing the original size of the antenna, so that the bandwidth of the antenna is improved, other performance of the antenna (such as gain and cross polarization level) is not influenced, and the occupied space is reduced; the novel broadband printed dipole antenna has the advantages of simple structure, convenience, practicability, wide adaptability and the like.

The invention discloses a millimeter wave rectangular-circular transition integrated corrugated horn antenna and a processing method and adopts integrated disposable electroforming for processing. A shell is internally provided with an inner cavity communicating from top to bottom in the shell, and the inner cavity consists of a corrugated inner wall radiation section, a circular waveguide extension section, a rectangular-circular transition waveguide section and a rectangular waveguide extension section from top to bottom, and one end of the port of the rectangular waveguide extension sectionin the shell is assembled with a connection part through sleeve joint. The corrugated horn antenna is electroformed by an inner core with the structure the same as that of the inner cavity, the integrated structure is adopted instead of various independent parts, the discontinuity of inner section change and deteriorated smoothness of a transition part caused by the processing dimension difference of all components, assembly and positioning error and other reasons are avoided, voltage standing wave ratio is reduced and antenna performance is improved, and compared with the traditional discrete part scheme, the scheme also reduces the requirement on processing accuracy properly. In the invention, the antenna performance, production technology complexity and time cost are all improved.

The invention discloses a base station antenna that is applied to an international mobile telecommunication-advanced (IMT-Advanced) system of a fourth generation wireless mobile communication system. The antenna unit employs a mode of multi-layer microstrip paster antenna and a basic structure of the antenna comprises a metal reflecting plate, a microstrip feeding layer, two radiating layers and a plurality of nylon insulating columns. The greatest innovation of the invention lies in an ultrabroad band characteristic of the antenna; a novel arrowhead coupling feeding groove and a double-layer radiation patch are employed; and a bandwidth can reach 49.5% on the condition that a standing-wave ratio is less than 1.5. On the basis of a reasonable design of a reflecting plate, a half-power lobe width of the antenna is a value caused by adding 6 degrees to 65 degrees or by subtracting 6 degrees from 65 degrees in a whole working frequency band range; and a convergence degree of a wave beam of the antenna has a good performance. According to the invention, a corner feeding mode is employed to carry out feeding and a dual polarization with plus / minus 45 degrees is realized on the condition that it is avoided that a radiation patch is rotated by 45 degrees, so that it is beneficial to reduce a whole length of an antenna array after arrangement of the array. On the basis of the basic structure that is based on the technical scheme of the invention, other concrete embodiments of the invention can be constructed only by reasonably changing a size of a radiation patch, a shape of a slotted floor and spaces between all layers.

A dielectric spacer for use during microwave ablation of tissue is disclosed. The dielectric spacer includes a housing having a predetermined thickness and a skin-contacting bottom surface. The housing is configured to be filled with a dielectric material having a predetermined dielectric permittivity. The housing is further configured to be placed on the tissue in proximity with at least one microwave antenna assembly, wherein the thickness and the dielectric permittivity are configured to shift a maximum voltage standing wave ratio of the at least one microwave antenna assembly.

This invention discloses a realization device and a method for base station antenna stationary-wave ratio alarm, in which, a digital signal process module samples the inverse power detecting signals, processes the sampled digitalized information and outputs the stationary-ratio alarm signals by calibrating the antenna aperture stationary-ratio and detecting the inverse power, which is only necessary to test the reverse signal power to realize the antenna stationary-wave ratio alarm.

The invention discloses an antenna switchover method and a terminal. The terminal comprises a plurality of antennas, a voltage standing wave ratio detector, a voltage standing wave ratio analyzer and a switchover device, wherein the antennas comprise at least one main antenna and are connected with the voltage standing wave ratio detector, the voltage standing wave ratio detector is connected with the voltage standing wave ratio analyzer, and the voltage standing wave ratio analyzer is connected with the switchover device. The antenna switchover method comprises the steps that the voltage standing wave ratio detector detects the voltage standing wave ratio state of each antenna, the voltage standing wave ratio analyzer judges the performance of each antenna according to the voltage standing wave ratio state of each antenna to find out the antenna with the best performance, and the switchover device switches a work antenna to the antenna with the best performance, and data transmission is carried out by utilizing the antenna with the best performance.

The invention discloses a position detection method and device for a fault of a cable. The method includes: transmitting swept-frequency signals, obtaining reflection coefficients at a group of frequencies through calculation; obtaining a relation between the reflection coefficients and positions of the cable or a relation between standing-wave ratios and the positions of the cable through calculation according to the reflection coefficients corresponding to the group of frequencies; comparing the reflection coefficients or the standing-wave ratios with preset threshold values and if one specific reflection coefficient or one specific standing-wave ratio is larger than a corresponding threshold value, a position of the cable, corresponding to the reflection coefficient or the standing-wave ratio is a fault point of the cable. The position detection method and device for the fault of the cable does not require adding of a hardware device or location of the fault through an instrument carried by detecting personnel and a breakpoint or a fault position of a cable between a device and an antenna feeder can be detected only through a soft procedure so that cost is reduced greatly, fault-diagnosing efficiency is improved and self-diagnosing function of the device is realized.

The invention relates to a method for rapidly tuning impedance matching of an antenna tuner. An initial impedance value of matching turning is provided through impedance detection; an optimized threshold value of a matching network is provided through standing-wave ratio detection, and the matching conditions of a circuit are balanced; the matching network is an n-type matching network, a front n capacitor C1 and an inductor L are formed through binary cell arrays, and a fixed value is adopted to a back n capacitor C2; a binary cell array circuit is characterized by 1 being formed by connecting a plurality of branches in parallel, wherein each branch is formed by connecting a switch and a capacitor C in series; 2 being formed by connecting branches in series, wherein each branch is formed by connecting a switch and an inductor L. The method includes the steps of detecting the initial impedance, judging whether the capacitor C2 is connected or not, conducting impedance detection again, calculating the value of the inductor L and the value of the capacitor C1, and judging increased or decreased stepping magnitude according to the impedance deviation degree and the turning frequency band. The method has the advantages of being capable of achieving rapid matching of the input impedance of an antenna, fast in adjusting speed, simple in operation and capable of ensuring the turning speed .

The invention provides an aperiodic array antenna design method. The method comprises the steps as follows: establishing an element model group of aperiodic array antenna, wherein the element model group comprises at least two antenna element models, and the distances between each antenna element model and other antenna element models adjacent to the antenna element model are different, and the directional diagram and the active voltage standing wave ratio of the antenna element model can meet design demands; establishing an initial aperiodic array antenna model, wherein the initial aperiodic array antenna model comprises at least three antenna elements; conducting the comprehensive optimization on the initial aperiodic array antenna model according to the optimization algorithm, updating the aperiodic array antenna model according to the result of optimization, updating antenna elements by using the antenna element models, and carrying out full wave analysis and process on the initial aperiodic array antenna model in sequence; when the error between a directional diagram obtained according to the optimization algorithm and a directional diagram obtained according to full wave analysis during once circular treating process is not larger than a preset threshold value, the design result of the aperiodic array antenna is obtained.