705results about "Helical antennas" patented technology

An F-inverted compact antenna for ultra-low volume Wireless Sensor Networks is developed with a volume of 0.024λ×0.06λ×0.076λ, ground plane included, where λ is a resonating frequency of the antenna. The radiation efficiency attained is 48.53% and the peak gain is −1.38 dB. The antenna is easily scaled to higher operating frequencies up to 2500 MHz bands with comparable performance. The antenna successfully transmits and receives signals with tolerable errors. It includes a standard PCB board with dielectric block thereon and helically contoured antenna wound from a copper wire attached to the dielectric block and oriented with the helix axis parallel to the PCB. The antenna demonstrates omnidirectional radiation patterns and is highly integratable with WSN, specifically in Smart Dust sensors. The antenna balances the trade offs between performance and overall size and may be manufactured with the use of milling technique and laser cutters.

A device useful for oral drug delivery device consisting of: (a) a capsule, tablet or pill designed to disperse in the gastrointestinal system; (b) an RFID tag positioned in the capsule, tablet or pill, the RFID tag comprising an antenna; (c) an object selected from the group consisting of a magnet, a ferromagnetic object, a ferrite object and an electromagnetic shielding object positioned within, over or adjacent the antenna of the RFID tag to alter the antenna characteristics of the RFID tag so that if the RFID tag is interrogated before the capsule, tablet or pill disperses in the gastrointestinal system, the response of the RFID tag is sufficiently altered or attenuated to determine that the capsule, tablet or pill has not dispersed in the gastrointestinal system and so that if the RFID tag is interrogated after the capsule, tablet or pill has dispersed in the gastrointestinal system, the object separates from the RFID tag so that the response of the RFID tag is sufficiently detectable to determine that the capsule, tablet or pill has dispersed in the gastrointestinal system. Alternatively, a switch can be used to signal ingestion of the device, and change the response of the device. In another embodiment, the instant invention is a device useful for oral drug delivery, consisting of: (a) a capsule, tablet or pill designed to disperse in the gastrointestinal system; (b) a first non-anti-collision RFID tag positioned in the capsule; (c) a second non-anti-collision RFID tag positioned in the capsule, so that if the RFID tags are interrogated by an RFID reader before the capsule, tablet or pill disperses in the gastrointestinal system, the response of the RFID tags collide and so that after the dispersible material of the capsule has dispersed in the gastrointestinal system thereby allowing the first and second non-anti-collision tags to separate from each other, then the response of the RFID tags is sufficiently different from each other to determine that the capsule has dispersed in the gastrointestinal system

In an embodiment, an antenna for a medical device, e.g., an implantable medical device (IMD), comprises an electrically conductive wire that spirals to form a three-dimensional shape of a rectangular cuboid. In another embodiment, the antenna comprises an electrically conductive wire that spirals to form a three-dimensional shape of an elliptical cylinder, an oval cylinder, an elongated pentagonal prism, an elongated hexagonal prism, or some other shape where the longitudinal diameter of the antenna is greater than the lateral diameter of the antenna. The antennas are sized to fit within a portion of a header of the medical device. Such antennas are designed to provide increased antenna gain and antenna bandwidth.

The present invention provides systems and methods for the evaluation of the urethra and periurethral tissues using an MRI coil adapted for insertion into the male, female or pediatric urethra. The MRI coil may be in electrical communication with an interface circuit made up of a tuning-matching circuit, a decoupling circuit and a balun circuit. The interface circuit may also be in electrical communication with a MRI machine. In certain practices, the present invention provides methods for the diagnosis and treatment of conditions involving the urethra and periurethral tissues, including disorders of the female pelvic floor, conditions of the prostate and anomalies of the pediatric pelvis.

A circular-polarization dipole helical antenna is used for electronic device and satellite terminal and includes a base, and an antenna conductor arranged on surface of the base. The antenna conductor includes a plurality of metal conductors with high Q value and anti-oxidation property and continuously and helically coated on surface of the base. The base is made of low loss and high dielectric constant material. An unbalance-to-balance circuit module connects two signal-feeding ends to the base with phase difference of 180 degree. The problems of narrow bandwidth, low efficiency, complicated structure and precise manufacture can be solved.

The present invention relates to an electromagnetic wave transmission/reception source for a multireflector antenna of the Cassegrain type comprising longitudinal-radiation means operating in a first frequency band and an array of n radiating elements of the travelling-wave type operating in a second frequency band with the n radiating elements arranged symmetrically around the longitudinal-radiation means, the array and the longitudinal-radiation means having an approximately common phase centre, the array of n radiating elements being excited by a waveguide of polygonal cross section. The invention applies especially in satellite communication systems operating in the C-, Ku- or Ka-bands.

An antenna device includes a substrate, and a radiating element disposed on the substrate. The radiating element has two spiral arms unfurling in an Archimedean progression and terminating in a logarithmic progression. The substrate is formed from a dielectric material and includes multiple perforations for providing passage of coolant through the substrate. The radiating element is disposed on a front surface of the substrate, and an enclosure is formed on a rear surface of the substrate to provide a reflective cavity for reflecting radiation to the front surface of the substrate. The enclosure includes a hexagonal perimeter formed by a wall. The antenna device may be used as an element in a planar phased array.

The present invention relates to systems, methods, and devices for consumers using RFID-tagged items for multichannel shopping using smartphones, tablets, and indoor navigation, preservation of consumer's privacy related to RFID-tagged items that they leave a retail store with, and automatically reading and locating retail inventory without directly using store labor. Robots and aerial mobile automated RFID reading devices are disclosed.

A helical antenna has a helix supported by a helix support. The helix support includes at least one piece of flexible sheet having its two surfaces covered with a layer antistatic material. The flexible sheet is curlable into a revolution surface configuration to form a revolution surface-shaped support section for at least partially supporting a portion of the helix component there around. A grounding mechanism electrically grounds the external sheet surface to the helix and the two sheet surfaces to one another when in the revolution surface configuration while a locking mechanism locks the flexible sheet in the revolution surface configuration. The combination of the helix and the flexible support renders the antenna structurally relatively rigid in all directions.

A helical antenna having a central axis defined between a base end and a distal end comprises a helical conductor wound about the central axis and having a feed line disposed at the base end and along the central axis, and may also include an elongated dielectric core about which the electrical conductor is wound.

The invention provides an apparatus and a corresponding method for controlling radiation characteristics of a transmitter of a wireless device. The wireless device includes a transmitting portion that includes one or more antennas that are characterized by one or more radiation patterns. The wireless device further comprises a sensor system for determining an orientation of the transmitting portion and a control system that is operatively coupled to the sensor system and configured to control the supply of power to each antenna depending on the orientation of the transmitting portion.

The present invention relates to systems, methods, and devices for using RFID-tagged items for omnichannel shopping and automatically reading and locating those items. Robots for automated RFID reading are disclosed. The present invention discloses Webrooming 2.0 (WR2.0) which will offer shoppers new views and tools. WR2.0 offers shoppers a bird's eye view of equivalent items in local retail stores. WR2.0 tools empower shoppers with preemptive purchasing power: the ability to redirect their online purchases from any online web store to a local retail store.

Aspects of a method and apparatus for an integrated antenna are provided. In an exemplary embodiment of the invention, a substrate may comprise one or more metal traces thereon and/or embedded therein. The substrate may be sufficiently flexible to be bent or molded into a shape that corresponds to the outer dimensions of a battery. When the substrate is bent into the shape corresponding to the outer dimensions of the battery, the one or more metal traces may form an antenna. A ferromagnetic laminate may be affixed to a first side of the substrate, and a dielectric laminate may be affixed to a second side of the substrate. The substrate may be wrapped around a battery and the battery and substrate may be integrated into a smartcard or other wireless communication device.

A dielectrically-loaded loop antenna with a cylindrical dielectric core, a feeder structure passing axially through the core, a sleeve balun encircling one end portion of the core and helical antenna elements extending from a feed connection with the feeder structure at the other end of the core to the rim of the balun. The antenna elements are arranged as a pair of laterally opposed groups of conductive elongate helical elements each having at least first and second conductive elements of different electrical lengths to form a plurality of looped conductive paths. By forming at least one of the conductive elements in each group as a conductive strip with one or both edges meandered, such that the edges of the strip are non-parallel and have different electrical lengths, additional modes of resonance arc created, yielding an improvement in bandwidth.

A device for directing energy to a target volume of tissue includes a helical antenna assembly that includes a helical antenna radiating section having a helical antenna element. The helical antenna assembly is capable of operating in at least one of a first mode of operation for directing energy to a first portion of the target volume of tissue and a second mode of operation for directing energy to a second portion of the target volume of tissue.