Showing papers on "Feed line published in 2006"

Sonar sensor array signal distribution system and method

Abstract: A system and method for signal distribution within a sensor array uses a coaxial transmission line. Taps are affixed to the outer conductor of the coaxial transmission line and include field coupling portions extending into the internal field region of the coaxial transmission line. Electromagnetic energy propagating within the transmission line can be extracted to power the sensors. Sensor signals can be modulated onto radio frequency signals and propagated along the transmission line to distribute the sensor signals.

The Power Line Transmission Characteristics for an OFDM Signal

Abstract: In this paper, we measured what influence the sinusoidal transmission characteristics of the electric power line with various forms gave to the transmission characteristic of OFDM (Orthogonal Frequency Division Multiplexing) signal through PLC (power line communication system) modem. The electric power line transmission line with various forms in a real environment is classified into two basic elements, which are an outlet type branch and a switch type branch. Next, PHY rate (Physical rate) is measured for each basic element connected with the PLC modem. At this time, the transmission characteristics of the electric power line are simulated from measured data. OFDM sending and receiving systems are composed on the computer, and the PHY rate is simulated. By comparing with measured and calculated values, it is revealed that PHY rate of PLC modem is most affected in the case of the power line transmission characteristics having broad band and high level attenuation and is not affected in the case of that having narrow band group delay variation.

Antenna apparatus for portable terminal

Abstract: An antenna apparatus for a portable terminal having a main board is provided. The antenna apparatus includes a main antenna that electrically connects to a feed line of the main board. A metal frame is constructed as part of a case frame forming an exterior of the portable terminal. The metal frame is divided into first and second parts that are separated. The first part electrically connects to the main antenna or to the main board feed line, and is designed to radiate. The second part electrically connects to a ground surface of the main board. The metal frame enhances overall antenna performance rather than causing degradation through interference.

RFID conveyor system

Abstract: A conveyor system for processing items on which radio frequency identification tags are disposed includes a frame and a conveyor that is disposed moveably on the frame and that conveys items through a path of travel, each item having at least one respective radio frequency identification tag disposed thereon. A first antenna is disposed proximate the path of travel so that the first antenna radiates radio frequency signals into a first area that is proximate the conveyor and through which the items pass and receives responses to the radio frequency signals from the respective radio frequency identification tags. A second antenna is proximate the first antenna and the path of travel so that the second antenna radiates radio frequency signals into the first area. At least one radio frequency receiver receives signals from the first antenna corresponding to the responses received by the antennas from the respective radio frequency identification tags and outputs first signals corresponding to the responses. A processor receives the first signals and is programmed to associate a first signal with a first item when the processor receives the first signal while at least a portion of the first item is within a predetermined second area that includes at least part of the first area. The second antenna radiates radio frequency signals that interfere with reception of and response to the radio frequency signals from the first antenna by a respective radio frequency identification tag in the presence of radio frequency signals from the first antenna and the second antenna. The second antenna is disposed with respect to the first antenna and the conveyor so that the second antenna radiates radio frequency signals into a third area that is proximate to but generally excludes the second area.

94-GHz Planar Dielectric Rod Antenna With Substrate Integrated Image Guide (SIIG) Feeding

Abstract: A planar derivative of dielectric rod antenna is demonstrated in the 94-GHz range. It is directly fed by substrate integrated image guide (SIIG), a low-loss dielectric waveguide in planar form. Compact integrated fabrication of the antenna and the feed line on a single substrate thus becomes feasible at low cost. Simulation and measurement results of an experimental prototype are presented. The antenna provides attractive attributes such as medium gain, high radiation efficiency, broad bandwidth, and almost frequency-independent main lobe direction

On-line detecting and positioning device for local discharging of electrical insulated combined electrical appliance, and positioning method thereof

Abstract: This invention relates to gas insulation combination electric apparatus partial discharge online detecting and position equipment and its position method. It belongs to electric equipment insulation detecting technique field. This invention includes sensor array consisted by microtrip patch antenna, two groups multiple intelligence selecting switch; two amplify filter, high speed digital collector, computer and control module. The array in this invention is made up by the microtrip patch antennas fixed at GIS basin type insulator, its antenna is made up by rectangular metal patch, medium board, metal platter, coaxial probe type feed line and antenna shielding case. This invention is computer program control, it can online, actual time, quickly, actually poison of GIS inner discharging. This invention can be widely used to electric generator plant booster station and electric network GIS electric substation, it can auto detecting GIS inner partial discharge, and actually poison of partial discharging defect, also it can interconnection run with electric substation and electric generator plant auto monitoring system.

Quasi-circulator for antenna multi-coupler system

Abstract: A multi-coupler system for isolating radio signals in a transceiver, that includes a transmitter and a receiver, to permit simultaneous transmit by the transmitter and receive by the receiver through a single antenna in the exact same or nearby frequency ranges This is done so that in-coming receive signals, transmitted from a remotely located radio, being detected by the receiver is much stronger than the portion of the transmit signal unintentionally coupled over by the co-site (or co-located) transmitter The invention uses a special electronic circuit, termed the quasi-circulator, to couple the antenna to both the co-located receiver and the transmitter The invention can also be used to couple several transceivers to a single antenna The quasi-circulator circuit includes a simulated antenna load with an impedance matched to the antenna impedance The circuit also includes a transformer with its primary side fed asymmetrically by the antenna so that it can pass the desired receive signal with minimum attenuation The transformer's primary is on the other hand fed symmetrically from both sides by equally small portions of the transmit power from the co-site transmitter, but these signals are 180 degrees out of phase and cancel almost completely in the transformer

Design of an internal antenna with wide and multiband characteristic for mobile handset

Abstract: The development of a small electrical antenna plays an important role in the rapidly growing mobile communication market. This paper presents the design of a novel small and wideband planar inverted F-antenna that simultaneously covers the GSM900/GPS/DCS1800/DCS1900/IMT2000/WLAN/DMB service bands. A very wide impedance-bandwidth characteristic was achieved by optimizing both the distance between the feed line and short strip and the width of a short strip. The commercial electromagnetic software CST Microwave Studio is used to design the structure. The maximum gains at the frequencies of 915, 1850, 2025, and 2450 MHz were 1.79, 3.56, 3.65, and 1.67 dBi, respectively. The overall radiation pattern is suitable for mobile application. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 947–950, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21528

Discharge prevention circuit and electronic equipment provided with the discharge prevention circuit

Abstract: A discharge prevention circuit and electronic equipment with the discharge prevention circuit are provided. The discharging prevention circuit includes a first power line, a second power line, a capacitor, a current detector and a switch. The first and second power lines directly or indirectly connect a power feed line to a load. The capacitor and the current detector are directly or indirectly connected in series between the first and second power lines. The switch is disposed in the first or second power line. The current detector detects at least charging current to the capacitor and discharging current from the capacitor. And if the current detector detects discharging current from the capacitor, the switch acts to stop current flow between the capacitor and the power feed line through the switch.

Signal measurement systems and methods

Abstract: An exemplary embodiment of a measurement system for conducting measurements on a device-under-test (DUT) includes a signal transmission line, an impedance controlling tuner including a signal transmission line segment as part of the signal transmission line, and a low-loss, electrically small signal coupling probe coupled to the signal transmission line in a non-contacting relationship for sampling signals propagating along the signal transmission line

Integrated circuit antenna structure

Abstract: An integrated circuit (IC) antenna structure includes a die, a package substrate, an antenna element, a ground plane, and a transmission line. The antenna element is on the die and/or package substrate and has a length in the range of approximately 1¼ millimeters to 2½ millimeters. The ground plane has a surface area larger than a surface area of the antenna element. The transmission line is on the die and/or the package substrate and includes a first line and a second line, wherein at least the first line is electrically coupled to the antenna element.

Ultra Low Profile Dipole Antenna with a Simplified Feeding Structure and a Parasitic Element

Abstract: This study is devoted to a half-wave dipole with a conductor plane at a distance much smaller than a quarter wavelength which we designate as an ultra low profile dipole (ULPD) antenna in this paper. The concerns of ULPD antenna are the feeding method and the impedance matching, because the input impedance usually tends to be lowered by the existence of a metallic structure in its proximity. In this paper, we propose a ULPD antenna with an excellent impedance matching and a coaxial feed built within the antenna structure so that the external matching and a balun are not required. A coaxial cable is used as a feed line and extended to be a half of a half wavelength dipole. The other half is made up of a parasitic element, which is connected to the outer conductor of the coaxial radiator. To make a matching, the outer conductor of the coaxial radiator is stripped off at a suitable length, and the total length of a dipole is considered for its resonance at a desired frequency of 2 GHz. The experiment has been conducted. The results show the return loss of -27 dB and the maximum gain of 9 dBi in the normal direction to the conductor plane. The computational results are also obtained, which agree well with the experimental results.

Printed circuit notch antenna

Abstract: The embodiments contemplate a printed circuit board of at least two layers for providing remote wireless communication between a wireless device and a unit, as well as methods of creating an omni-directional radiation pattern for transmitting/receiving information using a notch antenna formed in the printed circuit board having radio frequency circuitry. The notch antenna, with a closed and opened end, may be etched or embedded into a ground plane conductor on a first layer of the board. A transmission line positioned on the bottom surface of a second layer of the board crosses under the portion of the board containing the notch antenna. A first and second intermediate layer electrically connected between the first layer and the second layer may serve as return ground planes for the transmission line. A capacitive circuit, positioned in series with the transmission line and across the notch antenna, functions to reduce and/or eliminate inductance of the transmission line.

RF impairments in multiple antenna OFDM : influence and mitigation

Abstract: RF Impairments in Multiple Antenna OFDM Inftuence and I\tlitigation The application of multiple-autemm techniques in combination with frequency divi;üon multiplexing ( OFDI\I) thc possibility to rcalise high data rate wircless c:ommunication systems. lts high speetral awl to turn the ad verse dü,;persiveness of tlw wireless c:hanncl into an advantage are the main reasous mnltiple-input multiple-output (:\Hf..f()) OFDM was selected a;:; thc basis for various next-gcncration ::VIany research ernerge. however, ou thc path to an dficicnt and effec:tivc implementaüon of this kind of systcms. to thc high scnsitivity to S)'nchronisatiou and non-idealitics (RF) front-ends. Thercfore. the aim of thc work presentcel in this thesis Îf' to rnvve the concept of throughput wideband l'viiMO tnmsmissions, to reven! thc sensitivity of .\II.lviO OFDM to thc non-idealities in thc ana.logue front-<·ud and to design digital ,.;ynchronisatiou and mitigation approaches to rednee this impairment susceptibility. To that end, a design of a f..Ill\IO OFDI\I system for wirclcss local-area-uctworks is proposcel in the first part of this thesis. It is shown how this design ean be made backwarel compatible with currently systems basedon the popular IEEE 802.11 standard. Differcut synchronisatiou algorithms are proposcel and evaluat<:d for such systems. Fnrt hcrmore, the implcrncntation of a test systcrn \Vith thrcc transmitter and thrcc n:ceiver (RX) brauch(cS, applying tbc proposcel synchronisation algorithms, is trcated. Results frmn throughput mcasnrements with this system are in the thesis and serve <1S proof of concept for widchand MI.\IO transrnissions. lt can be concludcd from these rcsults that. on avcragc. a doubling of the throughput, compared to that of the singlc-antenna counterpart. is achieved with tbc system. The secortd part of the thesis focusses on the performance and mitigation approaches for, threc major RF front-end impairrnents in multiple-antenna OFDf..I systemc;: IQ imbalanee and nonlinearitîes. For that purpose, behaviournl models for these impcrfections are developed and reviewed. Using these mudels the influence of the impairrnents on the received and systern performance is

Design of patch antenna with switchable circular polarization using a branched feed circuit

Abstract: A reconfigurable circularly polarized antenna is presented. The proposed antenna consists of a microstrip feed line, a ground plane with two slots, and a radiation patch. Bifurcating the microstrip feed line into two branches allows the polarization to be switched by opening and shorting the termination of the line using an anti-parallel diode pair. The design of the proposed feed structure for polarization-diversity operation is discussed, and switching between right- and left-handed circular polarization (CP) is demonstrated with cross-polarization discrimination of greater than 30 dB. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1–4, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21246

Low loss electrical delay line

Abstract: A delay line system able to reduce the microwave loss by reducing the effective dielectric loss and dielectric constant of the system including a signal line, dielectric system with opened trench or slot filled up with the air or lower dielectric loss material, a ground plane, and a system of switches if the line is to be variable. The delay line proposed in this invention could be made of any type of signal line configuration, for example: micro-strip line, strip line, or coplanar line. The signal line can also be made as single ended or differential pairs of any configurations. The delay line systems based on the fundamental techniques provided in this invention can be used for on-chip devices where the delay line is laid on the oxide or dielectric material, or in a traditional PCB implementation such as FR4.

Beam adjusting device

Abstract: The present invention relates to a device for adjusting the beam direction of a beam radiated from a stationary array of antenna elements, wherein at least two antenna element feed points are coupled to a common signal source via a feed line structure having a source connection terminal to be connected to said source and at least two feed connection terminals to be connected to said antenna element feed points, said feed line structure being at a distance from and in parallel to a fixed ground plane on at least one side of said feed line structure, wherein a movable element is located adjacent to said feed line structure so as to change the signal phase of signal components being transferred between said source connection terminal and the respective feed connection terminals, said movable element being movable for effecting a controlled phase shift of said signal components so as to adjust said beam direction. The device is provided with detection means for detecting the absolute position of the movable element.

Open-ended two-strip meander line antenna, RFID tag using the antenna, and antenna impedance matching method thereof

Abstract: An open-ended two-strip meander line antenna, an RFID tag using the same and an antenna impedance matching method thereof are provided. The antenna includes: a radiating strip line for deciding a resonant frequency of the antenna; and a feeding strip line for providing a radio frequency (RF) signal to an element connected to the antenna, wherein ends of the radiating strip line and the feeding strip line are open.

Adapter unit e.g., for connection of motor vehicle radio, has screened antenna cable connected to modulation unit with antenna signal output for connection to antenna signal input of motor vehicle radio

Abstract: An adapter unit for connecting an audio signal output of an electronic device (9) to a car radio (6). The adapter unit has a screened antenna cable connected to the modulation unit (8) and with an antenna signal output (5) for connection to an antenna signal input of the car radio, to demodulate the high frequency carrier with the modulated audio signal as an RF signal in the car radio.

Inductively coupled feed structure and matching circuit for RFID device

Abstract: A feed structure (18) and matching circuit (20) for inductively coupling an antenna (16) with an IC (22) in an RFED tag (10). The tag (10) includes first and second feed structures (26, 28) coupled with the antenna (16), a first transmission line (30) coupling the feed structures (26, 28), and a matching circuit (20) including a second transmission line (32) having a portion that is substantially parallel to and spaced apart from the first transmission line (30) such that the first and second transmission lines (30,32) inductively couple. Where two or more antenna elements (56, 57) are used, the elements (56, 57) are sufficiently loosely coupled by inductive coupling that they can operate at nearly the same frequency without forming a single resonant antenna. Thus, for example, different elements can operate at approximately 905 MHz and approximately 925 MHz, respectively, to effectively cover the FCC range of 900-930 MHz.

Frequency hopping RF transceiver with programmable antenna and methods for use therewith

Abstract: A (radio frequency) RF transmission system includes an RF transmitter that generates an RF signal at a sequence of selected carrier frequencies. A frequency hop module, coupled to the RF transmitter generates the sequence of selected carrier frequencies. A programmable antenna is tuned to each of the sequence of selected carrier frequencies to transmit the RF signal via an antenna current.

Method and device for detecting connection state of antenna and feed line

Abstract: 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.

Transmission line transistor attenuator

Abstract: An attenuator has an input adapted to receive a signal to be attenuated, and an output adapted to output an attenuated signal, and a shunt transmission line transistor having a gate transmission line adapted to receive an attenuator control voltage, a source configured as a source transmission line, and a drain configured as a drain transmission line. One of the source transmission line and drain transmission line is connected to ground and the signal to be attenuated passes through the other of the source transmission line and drain transmission line.

Multiple-layer patch antenna

Abstract: A patch antenna for receiving and/or transmitting circularly polarized RF signals includes a first radiating layer and a second radiating layer disposed substantially parallel to each other. Each radiating layer defines a pair of perturbation features. A ground plane layer is disposed underneath the radiating layers. The antenna also includes a feed line layer implemented as a coplanar wave guide and disposed between the radiating layers. The feed line layer allows for connection of a single transmission line to the antenna and for electromagnetically connecting the radiating layers to the transmission line. Dielectric layers separate the radiating layers, feed line layer, and ground plane layer.

High gain steerable phased-array antenna

Abstract: A high gain, phased array antenna includes a conducting sheet having a number of one or more slots defined therein. For each slot, an electrical microstrip feed line is electronically coupled with a corresponding slot to form a magnetically-coupled LC resonance element. A main feed line couples with the one or more microstrip feed lines. At least one slot and/or microstrip feed line includes at least one segment with greater width than other segments.

Cellular base station subsystem

Abstract: A method of operating a cellular base station subsystem such as a smart bias tee. The method comprising: modulating a first control data signal to generate a first modulated carrier signal; multiplexing said first modulated carrier signal with a first RF antenna signal onto a feed line; demultiplexing a second RF antenna signal and a second modulated carrier signal from said feed line; demodulating the second modulated carrier signal to generate a second control data signal; analyzing at least one of said signals to generate diagnostic data; and outputting said diagnostic data. The subsystem also has an addressable memory adapted to provide data on request from said subsystem.

Substrate type dipole antenna having stable radiation pattern

Abstract: A Ultra WideBand (UWB) substrate type dipole antenna is provided which has a stable radiation pattern. The UWB substrate type dipole antenna includes a dielectric substrate, a first radiator formed on a side of the dielectric substrate, a signal line transmitting an energy from a coaxial cable to the first radiator, and a plurality of second radiators formed at a predetermined distance from the first radiator and the signal line, and respectively having therein a plurality of slits of a predetermined configuration. Because there is no leakage of electric current to an outer part of an external conductor of the coaxial cable, even when the connection of the connector and the coaxial cable to the antenna, distortion of the radiation pattern of the antenna is prevented. As a result, the same radiation pattern and the direction of maximum radiation may be obtained before and after connection with the connector and the coaxial cable.

Use of low-cost patch antennas in modern wireless technology

Abstract: In this article, an overview of a special type of antenna called patch antennas is presented. Patch antennas are used in several wireless applications like global positioning system (GPS) receivers and radar systems. A patch antenna is constructed by having a conductive patch on a dielectric substrate above a conductive ground plane. A patch antenna can be constructed and integrated on a PCB or within a chip along with other circuit components. The excitation of the patch is via a feed line. This feed will supply the patch with the electrical signal to be converted to an electromagnetic wave. Several feed types exist based on the patch type and application. This article gives an overview of the construction of this type of antenna, its major characteristics, and design parameters along with the technologies in which it is being used

Feed line for a local coil for magnetic resonance imaging with standing wave barrier integrated into the plug thereof

Abstract: Feed line for at least one local coil in a magnetic resonance tomography apparatus, comprising at least one coil plug as well as at least one standing wave barrier for suppression of unwanted radio-frequency currents on a conductor cable of the feed line, with the standing wave barrier integrated into the coil plug.

Antenna compensation system and method in a communications device

Abstract: A communications device is provided The communications device includes an antenna port, transmitter circuitry configured to broadcast a radio frequency (RF) output signal across the antenna port, and a controller configured to adjust a signal level of the RF output signal in accordance with antenna compensation information The antenna port, the transmitter circuitry, and the controller are at least partially integrated on the same integrated circuit