Showing papers on "Feed line published in 2014"

Enhanced Transmitter for Wireless Power Transmission

Abstract: An enhanced transmitter for wireless power transmission is disclosed. The transmitter may be able to transmit radio frequency (RF) waves or pockets of energy for charging or powering an electronic device. The transmitter may include antenna element arrangements for receiving RF waves from a plurality of wireless sources and process them using a dedicated RF integrated circuit (RFIC) and set of antenna elements for receiving RF input signals from a plurality of wireless power sources. A digital signal processor (DSP) may be used to control reception using the dedicated RFIC and antenna elements of reception and to control transmission of wireless power selecting the transmitting RFICs and configuration of antenna elements to send RF waves or pockets of energy to a wireless receiver. The frequency of RF waves received may be sampled through a down converter array and line addressing devices to send the signals received to a micro-controller including a proprietary algorithm which control switching and processing necessary for faster and enhanced wireless power transmission, thus improving transmission efficiency.

Printed monopole antenna with tapered feed line, feed region and patch for super wideband applications

Abstract: A novel and compact super wideband (SWB) exponentially tapered feed region and patch printed monopole antenna is proposed. This antenna is fed by a 50-Ω triangular tapered feed line. The antenna operates over a bandwidth of 2.5-80 GHz with a return loss of 10 dB or more. The dimensions of the proposed antenna are 40 × 30 × 1.6 mm 3 . An exponential curve is employed in the feed region and a triangular tapered feed line is used. The ground plane feed gap is optimised to 1.3 mm. The proposed tapered monopole antenna has demonstrated an ultra-large bandwidth with satisfactory radiation properties. Two particular antennas are examined, one with a rectangular feed line and another with a triangular tapered feed line. The performance of the antenna in frequency domain is investigated, and a good agreement is achieved between the simulation and experimental results. In addition, the time domain characteristics of the proposed antenna are evaluated experimentally. This antenna can be used in ultra-wideband or SWB applications.

System, Method and Apparatus for Improving Accuracy of RF Transmission Models for Selected Portions of an RF Transmission Path

Abstract: Systems and methods for determining an RF transmission line model for an RF transmission system includes generating a baseline RF transmission line model characterizing the RF transmission system. A plasma RF voltage, RF current, RF power and/or a corresponding RF induced DC bias voltage is calculated from the baseline RF transmission line model. An end module including the electrostatic chuck, a plasma and an RF return path is added to the baseline RF transmission line model to create one or more revised RF transmission line models. A revised plasma RF voltage, a revised plasma RF current, a revised plasma RF power and/or a corresponding revised RF induced DC bias voltage is calculated from each of the revised baseline RF transmission line models. The revised RF transmission line models are scored to identify a best fitting revised RF transmission line model as a complete RF transmission line model.

Electrically Large Zero-Phase-Shift Line Grid-Array UHF Near-Field RFID Reader Antenna

Abstract: A grid-array antenna using a zero-phase-shift (ZPS) line is proposed to enlarge the interrogation zone of a reader antenna for near-field ultra-high-frequency (UHF) radio frequency identification (RFID) system The proposed grid-array antenna is composed of a number of grid cells and a double-sided parallel-strip line feeding network Each grid cell, namely segmented loop constructed by the ZPS line, has uniform and single-direction flowing current along the line By configuration of the cells sharing a common side with its adjacent grid cells which carry reverse-direction flowing current, a grid-array antenna is formed to generate a strong and uniform magnetic-field distribution over a large interrogation zone even when the perimeter of the interrogation zone reaches up to 3λ (where λ is the operating wavelength in free space) or larger As an example, a grid-array antenna with 1 × 2 segmented ZPS line loop cells implemented onto a piece of FR4 printed board (PCB) is designed and prototyped The results show that the grid-array antenna achieves the impedance matching over the frequency range from 790 to 1040 MHz and produces strong and uniform magnetic-field distribution over an interrogation zone of 308 mm × 150 mm

Circular Polarized Antennas

Abstract: An apparatus comprising at least one antenna for transmission and/or reception of circularly polarized electromagnetic radiation. The antenna includes a radiating element and a single feed line. The single feed line is coupled between the radiating element and a circuit that drives the antenna. The radiating element has a non-symmetrical outer perimeter shape. The radiating element may include an aperture. The antenna may further include a ground element and a supplemental ground feed structure, the supplemental ground feed structure located between the radiating element and the ground element.

Design of Filtering Microstrip Antenna Using Filter Synthesis Approach

Abstract: Design, simulation, and measurement of a compact flltering microstrip antenna is presented. A feed line, two hairpin resonators, and a rectangular patch are integrated to form the flltering antenna. The elements together function as a third order bandpass fllter with Chebyshev equal ripple response of 0.043dB at midband frequency of 2.0GHz. The rectangular patch acts not only as a radiating element, but also as the last resonator of the bandpass fllter. The proposed flltering antenna exhibits good out-of- band gain suppression, ∞at in-band gain response, good selectivity at the band edges, and well-shaped radiation pattern.

Double-frequency coupled antenna with metal frame

Abstract: A double-frequency coupled antenna with a metal frame comprises the metal frame, a printed circuit board (PCB) arranged in the metal frame, and an antenna unit, wherein the metal frame comprises a closed loop metal frame formed by a first frame, a second frame, a third frame and a fourth frame, the PCB comprises a circuit area and a clearance area, the antenna unit comprises a feed line and a coupling line, the feed line is connected with a feed source, the coupling line is electrically connected with the fourth metal frame, and two ends of the fourth frame are connected with a ground of the PCB to form a closed-loop radiation loop According to the double-frequency coupled antenna with the metal frame, the metal frame is designed as a part of an antenna irradiator, and projection areas of the PCB of the antenna are reduced; the metal frame does not need slotting, by means of a coupled feeding manner, current of the antenna in the whole radiation loop can be more evenly distributed, and the problem that finger touch affects properties of the antenna of mobile terminals is solved; by means of a slotting manner, the requirement of the antenna for PCB clearance environments is reduced, and thus, the antenna is applicable to more complicated mobile phone environments

Passive repeater for wireless communications

Abstract: Some embodiments provide a relatively small antenna apparatus that acts as a passive repeater. The antenna apparatus can be designed to facilitate radio frequency (RF) signal gain for a collection or range of frequencies. In some embodiments, the antenna apparatus is placed near a device with a wireless receiver and/or transmitter, where the antenna apparatus causes increased RF signal intensity at the device by coupling RF signals from a proximate area of higher RF signal intensity into the area around the device. Accordingly, in some instances, an embodiment of the antenna apparatus can be used to increase the RF signal intensity in a null spot or dead spot by coupling RF signal energy from an area proximate to the null spot that has higher RF signal intensity.

Design and Implementation of an Active Array Antenna With Remote Controllable Radiation Patterns for Mobile Communications

Abstract: This paper presents an active array antenna for wideband code division multiple access (WCDMA) base station application with remote controllable radiation patterns. The proposed array consists of eight antenna elements and each element is integrated with a phase controllable radio frequency (RF) transceiver. The radiation pattern of the active array antenna or phased array antenna is consequently remote controllable. Meanwhile, due to the RF transceivers are directly connected to the antenna elements without any passive feed network, the feed line loss is greatly reduced and the efficiency is significantly improved. The local oscillator (LO) phase shifting technique based on a hybrid direct digital synthesizer (DDS)-phase-locked loop (PLL) approach is adopted to achieve high phase resolution. Consequently, a 360° phase shifting range with 0.35° tuning step can be achieved, which results in a 0.1° beam-steering resolution. To verify the proposed active array antenna, a prototype is developed and measured. The experiment data are in good agreement with the simulated results.

Coupled‐sectorial‐loop antenna with circular sectors for super wideband applications

Abstract: A coupled-sectorial-loop antenna (CSLA) with circular sectors is presented for super wideband (SWB) applications Conventional CSLA consists of two parallel sectorial loop antennas connected along an axis of symmetry and triangular sectors are used The average input impedance of the conventional CSLA is over 100 Ω, and a half of the CSLA above a ground plane is used to match with a 50-Ω feed line In the proposed antenna, circular sectors are used instead of triangular sectors to directly match with the 50-Ω feed line, and the full structure of the CSLA is used A prototype of the proposed antenna is fabricated on an FR4 substrate, and its performance is compared to the conventional CSLA The experimental results show that the frequency band for a voltage standing wave ratio < 215 is 10–194 GHz (1804%), which satisfies the requirement of the SWB antenna © 2014 Wiley Periodicals, Inc Microwave Opt Technol Lett 56:1683–1689, 2014

Substrate-integrated coaxial-cavity filter with tunable center frequency and reconfigurable bandwidth

Abstract: This paper presents a substrate-integrated coaxial-cavity bandpass filter with both continuous center frequency tuning and continuous bandwidth (BW) tuning. A surface mount varactor connects the center conductors of the coaxial resonators. Tuning this varactor's capacitance changes the inter-resonator coupling between the resonators and tunes the BW. Another surface mount varactor on the coplanar waveguide feed line adjusts the external coupling at different BWs. Lumped varactors are also used to capacitively load the coaxial transmission line to tune the center frequency. Measured results show a BW range of 20-100 MHz from 0.8 GHz to 1.13 GHz and a BW range of 34-40 MHz from 0.55 GHz to 1.13 GHz with return loss better than 10 dB. Peak insertion loss of 1.07 dB is measured at 1.13 GHz with 100 MHz BW. Due to dispersive inter-resonator coupling, a transmission zero occurs above the passband that sharpens skirt selectivity. Fabrication is compatible with standard PCB technology with single-layer surface-mount lumped elements as tuners.

Dual Band Rectangular and Circular Slot Loaded Microstrip Antenna for WLAN/GPS/WiMax Applications

Abstract: In the present work the rectangular micro strip antenna is loaded by triple rectangular slot and dual circular slot. This slot loaded antenna provides dual frequency band. In first frequency band (1.29-1.67GHz) the bandwidth of antenna is 25.675% and in second frequency band (2.02-2.92GHz) the bandwidth of antenna is 36.437.Since the micro strip antenna suffers from narrow bandwidth hence the present work provide an alternative solution to increase the bandwidth. The proposed slot loaded Micro strip antenna is fed by 50? Micro strip feed line. The proposed antenna is simulated by IE3D Zealand simulation software based on method of moments.

Electronic device case with antenna

Abstract: A case for a mobile electronic device is provided. The case includes a shell, a case antenna, a transmission line, and a near-field coupling device. The shell encases at least a portion of the mobile electronic device. The case antenna is attached to the shell. The transmission line is also attached to the shell and electrically interconnects to the case antenna. The near-field coupling device has a feed port electrically interconnected to the transmission line and is configured to near-field couple to a native antenna of the mobile electronic device to capture an electromagnetic signal generated by the native antenna of the mobile electronic device. The near-field coupling device is also configured to conduct the captured electromagnetic signal from the feed port of the near-field coupling device to the case antenna through the transmission line.

Band-notched uwb monopole antenna design with novel feed for taper rectangular radiating patch

Abstract: In this paper, a novel dual notch bands Ultra Wide-Band (UWB) antenna for WLAN and WiMAX applications is presented. The antenna contains a taper rectangular monopole antenna with new feed line which is designed and modifled for 2{12GHz. To achieve notch band at WLAN frequencies, difierent methods are compared such as L-shape slots for one notch or dual rings in notch designing. On the other hand, the novel F-shape feed line is designed to achieve dual notch band characteristic. The efiects of stubs parameters at notch frequencies are presented. The beneflt of this novel feed line is designing multi-band and reconflgurable antenna by changing stub line parameters. The simulated results of prototype antenna are obtained with HFSS and CST. Total size of the antenna is 60mm£60mm£1:6mm. It is fabricated on FR-4 low cost substrate and fed by 50› microstrip line.

Implantable medical devices having cofire ceramic modules and methods of fabricating the same

Abstract: An implantable medical device (IMD) and methods of fabricating the same are provided. An IMD can include a housing and a cofire ceramic module (CCM) coupled to the housing. The CCM can include an antenna cofire-integrated in the CCM. The antenna can include a plate composed of conductive material, and conductive antenna elements that are annular substrates having perimeters substantially coextensive with the perimeter of the plate. The antenna can also include interconnections. A first set of interconnections can be coupled between the plate and one of the conductive antenna elements, and a second set of interconnections can be coupled between the conductive antenna elements. The antenna can also include a feed line conductively coupled to the plate. In some embodiments, the feed line can be substantially serpentine-shaped to adjust impedance in the CCM.

Design of Asymmetric Slot Antenna with Meandered Narrow Rectangular Slit for Dual Band Applications

Abstract: A compact, coplanar waveguide (CPW) fed asymmetric slot antenna with dual operating bands is proposed. The slot is modifled rectangular in shape and asymmetrically cut in the ground plane. A hexagonal patch fed by a two-step CPW is used to excite the slot. The feed itself is slightly asymmetric (shifted, with unequal ground planes). The asymmetric cuts on the slot together with the feed line asymmetry have helped in obtaining ultra wideband impedance matching. An extra resonance at 2.4GHz for Bluetooth applications is obtained by cutting an additional meandered narrow rectangular shape slit in the ground plane. The prototype of the proposed antenna has been fabricated and tested. The measured 10dB return loss bandwidth of the proposed antenna is 200MHz (2.3{2.5GHz) for the flrst band and 12.1GHz (2.9{15.0GHz) for the second band. The radiation patterns of the proposed antenna are obtained and found to be Omni-directional in H-plane and bi-directional in E-plane. The measured and simulated results are in good agreement.

UWB Monopole Antenna with Triple Band-Notched Characteristic Based on a Pair of Novel Resonators

Abstract: In this paper, a novel microstrip-fed compact antenna with triple band-notched characteristics is presented for ultrawideband (UWB) applications. The antenna consists of a circular radiating patch, a 50› microstrip feed line, a partially slotted ground plane, and a pair of modifled capacitance loaded loop (MCLL) resonators. The novel resonators are symmetrically located in the vicinity of the feed line to achieve triple band-notched characteristics, such as 3.4{3.7GHz for WiMAX, 5.15{5.825GHz for WLAN, 7.25{8.395GHz for X-band satellite communication. The good performance of triple notched bands, stable gain and omnidirectional radiation patterns in the operating bands make the proposed antenna a good candidate for UWB utilization.

A Novel Design of Low Power Rectenna for Wireless Sensor and RFID Applications

Abstract: In this paper, an efficient microstrip rectenna operating on ISM band with high harmonic rejection is presented. By using rotated E-shaped strip in the radiating patch, a new resonance at lower frequencies (2.4 GHz) can be achieved. Also by embedding cutting a rectangular slot with protruded interdigital strip inside the slot in the feed line a frequency band-stop performance can be achieved. The proposed structure has a major advantage in high harmonic rejection. The rectenna with integrated monopole antenna can eliminate the need for an low pass filter placed between the antenna and the diode as well as produce higher output power, with maximum conversion efficiency of 74 % using a 1 K $$\Omega $$ Ω load resistor at a power density of $$0.3\,\hbox {mW/cm}^{2}$$ 0.3 mW/cm 2 .

Novel Compact Filtering Power Divider with Harmonic Suppression

Abstract: This paper presents a novel power divider with flltering responses. By using quarter- wavelength resonators with a novel feeding structure, both power division and bandpass responses are obtained, and compact size is realized. Discriminating coupling is utilized to suppress the third harmonic to obtain wide stopband. The isolation resistor is connected at two ends of the input feed line, and good isolation is obtained. Two transmission zeros are generated at two edges of the passband, resulting in high selectivity. For demonstration, a flltering power divider is implemented. Comparisons of the measured and simulated results are presented to verify the theoretical predications.

Dual‐band circularly polarized aperture‐coupled stack antenna with fractal patch for WLAN and WiMAX applications

Abstract: This article presents a novel circular polarized (CP) aperture coupled stack antenna for wireless local area network and worldwide interoperability for microwave access dual-band systems. The compact stack antenna consisted of square fractal patch, aperture couple, feed line and the perturbation. The square patch is constructed with the complementary Minkowski-island-based fractal geometry. By way of adjusting the relevant parameters, we can obtain the dual-band responses at 3.5 and 5.25 GHz respectively. The CP of each band are presented. The measured 10 dB return loss impedance bandwidth are 270 MHz (7.5%) for 3.5 GHz band and 450 MHz (8.6%) for 5.25 GHz band. The 3 dB axial ratio bandwidths for each bands are 1.4 and 0.76%, the polarization of radiation patterns are both left-hand CP, and the antenna power gain are 2.84–3.1 and 0.16–2.2, dBic respectively. The proposed antenna is successfully simulated and measured with frequency responses, radiation patterns and current distributions. © 2013 Wiley Periodicals, Inc. Int J RF and Microwave CAE 24:130–138, 2014.

RF antenna assembly with feed structure having dielectric tube and related methods

Abstract: An RF antenna assembly may be positioned within a wellbore in a subterranean formation for hydrocarbon resource recovery. The RF antenna assembly includes first and second tubular conductors and a feed structure therebetween defining a dipole antenna to be positioned within the wellbore, and an RF transmission line extending within one of the tubular conductors. The feed structure includes a dielectric tube, a first connector coupling the RF transmission line to the first tubular conductor, and a second connector coupling the RF transmission line to the second tubular conductor.

Antenna structure with proximity sensor

Abstract: An antenna structure includes a dielectric layer, on one side thereof a patterned conductive layer, a proximity sensor and a capacitor are provided. The patterned conductive layer includes a first and a second conductive layer that together form a coupled-fed antenna and respectively have a first and a second feed terminal connected to a signal feed line and a ground signal line. The proximity sensor includes a peripheral circuit connected to the second feed terminal, and a capacitance to digital circuit. The capacitor is connected between the ground signal line and the second feed terminal. By integrating the coupled-fed antenna and the proximity sensor on one circuit substrate, a part of the antenna can be used as the proximity sensor's capacitor electrode to reduce the volume and manufacturing cost of the antenna, and the proximity sensor is not interfered by other parts of the antenna and thereby has increased sensitivity.

Apparatus and method for antenna matching

Abstract: A method and apparatus are for performing antenna matching and include determining a cable connection state of a cable connector, generating a cable detection signal that indicates the cable connection state, and modifying impedance transform of a tunable matching circuit in response to the cable detection signal. The cable detection signal indicates one of a presence and an absence of a cable connector. The tunable matching circuit couples a transceiver and an antenna. The tunable matching circuit couples the selected impedance transform between the transceiver and the antenna. The apparatus is a radio communication device that includes a transceiver, a processing system, an antenna, a tunable matching circuit, an input/output section, a cable connector, and a sensor.

Triple band-notched ultra-wideband antenna using a pair of novel symmetrical resonators

Abstract: In this study, a novel microstrip-fed planar antenna with triple notched bands is presented for various ultra-wideband (UWB) applications. The antenna comprises a circular radiating patch, a 50 Ω microstrip feed line, a partially slotted ground plane, and a couple of modified capacitance loaded loop (MCLL) resonators. The novel MCLL resonators are symmetrically located near the feed line to achieve the triple band-notched characteristics, such as 3.4–3.7 GHz for WiMAX, 5.15–5.825 GHz for wireless local area network and 7.25–8.395 GHz for X-band satellite communication. The good performance of triple notched bands, stable gain and omnidirectional radiation patterns in the operating bands make the proposed antenna a good candidate for UWB utilisation.

Broadband circularly-polarized square slot antenna fed by coplanar waveguide

Abstract: A novel circularly polarized slot antenna fed by coplanar waveguide (CPW) is presented in this paper. The proposed antenna consists of a square slot cut on the ground and a CPW feed line with a stepped impedance transformer. Two stubs are embedded in the CPW feed line to excite circular polarized wave while a slit is cut on the ground to enhance the impendence bandwidth. The measured impendence bandwidth ranges from 4.4 GHz to 7.9 GHz, with the AR bandwidth from 4.5 GHz to 7.5 GHz, which cover wlan (5.15~5.25,5.725~5.825), wimax (5.25~5.85) and Chinese Dedicated Short Range Communications (DSRC) for Electronic Toll Collection (ETC) systems.

Elongated capacitively coupled plasma source for high temperature low pressure environments

Abstract: A modular plasma source assembly for use with a processing chamber is described. The assembly includes an RF hot electrode with an end dielectric and a sliding ground connection positioned adjacent the sides of the electrode. A seal foil connects the sliding ground connection to the housing to provide a grounded sliding ground connection separated from the hot electrode by the end dielectric. A coaxial feed line passes through a conduit into the RF hot electrode isolated from the processing environment so that the coaxial RF feed line is at atmospheric pressure while the plasma processing region is at reduced pressure.

Apparatus and assembling method of a dual polarized agile cylindrical antenna array with reconfigurable radial waveguides

Abstract: Embodiments are provided for an agile antenna that beamsteers radio frequency (RF) signals by selectively activating/de-activating tunable elements on radial-waveguides using direct current (DC) switches. The agile antenna device comprises a first radial waveguide structure encased in a first frame, a first line feed connected to the first waveguide structure, a second encased radial waveguide structure similar and coupled to the first waveguide structure. The two waveguide structures include the tunable elements controlled by the DC switches. A second line feed is connected to the second waveguide structure. The two line feeds provide the RF signal to the antenna. The antenna device also includes a plurality of radiating elements positioned between the first radial waveguide structure and the second radial waveguide structure, and distributed radially around a circumference of the first radial waveguide structure and a circumference of the second radial waveguide structure.

A Dual-Band-Notched Antenna for UWB Communication Systems Using Two Different Shaped Slots

Abstract: A compact planar ultra-wideband (UWB) monopole antenna with controllable dual-band-notched characteristics is presented in this paper. U-shaped inverted slot and vertical up C-shaped slot are embedded in the feed line and in the radiating patch, for rejecting WiMAX and WLAN frequency bands, respectively. Moreover, the bandwidth of each rejected band can be independently shifted by adjusting the dimensions of the corresponding band-notched structure. The proposed antenna with two rejected bands characteristics is successfully simulated, prototyped, and measured. The measured results show that the proposed antenna operates until upper 10.6 GHz for voltage standing wave ratio (VSWR) less than 2 and exhibits bands rejection of 3.20–4.1 GHz (24.66%) and 5.20–5.96 GHz (13.62%) frequency band. Furthermore, the proposed antenna shows good radiation characteristics, stable peak gain, and provides more than 80% radiation efficiency, on the entire UWB frequency range except in the notched frequency bands, which prospects the employment in the UWB communication systems.

Dual-mode radio system having a full-duplex mode and a half-duplex mode

Abstract: Embodiments of a dual-mode radio system are disclosed. In one embodiment, the radio system includes a first radio unit including a transmitter, a receiver, an antenna, and switching circuitry adapted to couple either an output of the transmitter of the first radio unit or an input of the receiver of the first radio unit to the antenna of the first radio unit. In addition, the radio system includes a second radio unit including an antenna and either a transmitter having an output coupled to the antenna of the second radio unit, a receiver having an input coupled to the antenna of the second radio unit, or both a transmitter having an output selectively coupled to the antenna of the second radio unit and a receiver having an input selectively coupled to the antenna of the second radio unit. The radio system has both a full-duplex mode and a half-duplex mode.

Hearing assistance device with balanced feed-line for antenna

Abstract: A hearing assistance device, such as a hearing aid, includes an antenna connected to a communication circuit through a feed-line for wireless communication. The antenna and the feed-line are configured and placed such that capacitance between their conductors is approximately minimized. In one embodiment, the feed-line includes feed-line conductors each including a major portion approximately perpendicular to an antenna conductor. In another embodiment, the feed-line includes a feed-line conductor crossing the antenna conductor, and at least one of the antenna conductor and the feed-line conductor includes a notch in the crossing area to reduce the crossing area.