359 results about "Spiral antenna" patented technology

An apparatus and method using a front internal dual band television antenna or a pair of internal dual band antennas for a portable entertainment module having a housing and a display screen. A front spiral antenna is embedded in the housing around the periphery of the display screen and is tuned to compensate for the influence nearby components. A rear logo-periodic antenna is located inside the rear of the housing and is modified to have various environmental openings to fit around existing components, vents and structures in the housing. Any pair of different antenna architectures could be used.

An electrically small dual-band planar tunable UHF / L-Band antenna. In one example, the dual-band antenna includes a combination of a semi-spiral antenna for the UHF frequencies and a microstrip patch antenna for the L-band frequencies.

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.

A semiconductor package comprises a package board and a plurality of semiconductor chips sequentially stacked on the package board. Each of the semiconductor chips comprises a semiconductor substrate and an open loop-shaped chip line formed on the semiconductor substrate. The open loop-shaped chip line has first and second end portions. The first and second end portions of the open loop-shaped chip lines are electrically connected to each other by connectors, and the connectors and the open loop-shaped chip lines constitute a spiral antenna.

Described herein is a device for glaucoma treatment and monitoring that comprises a combination of an intraocular pressure (IOP) sensor and a glaucoma drainage device. The device comprises an IOP sensor and an inductive antenna mounted within a porous biocompatible material that forms the drainage path. The IOP sensor is mounted in a footplate portion of the device and is mountable in the anterior chamber of an eye. The footplate portion is connected to a body portion that houses the spiral antenna by a neck portion which retains the footplate portion in a suitable position within the anterior chamber. Due to its size, the footplate portion housing the IOP sensor can readily be inserted into the anterior chamber with the body portion housing the spiral antenna located outside of the anterior chamber in a sub-scleral space to disperse the aqueous humour.

An antenna device, comprising an antenna unit including basic body comprising at least one of dielectric ceramic and magnetic ceramic, at least one conductor disposed at least one of inside and on a surface of the basic body, and a feeding electrode for applying a voltage to the conductor disposed on the surface of the basic body; a mounting board on which the antenna unit is mounted; a ground part in association with the mounting board and adapted to resonate with the antenna unit; and a length in the polarization direction of a radio wave of the ground part being about lambd / 4 or more, where lambd is a wavelength of the radio wave, the basic body comprising a first generally planar sheet having a plurality of spaced, first conductors formed on one major surface thereof and a second generally planar sheet having a plurality of spaced second conductors formed on one major surface thereof; the first and second generally planar sheets being laminated together to form an elongated structure wherein respective pairs of the first and second conductors are coupled to one another to form respective spiral loops of a spiral antenna so that a central axis of the spiral antenna extends generally parallel to a longitudinal direction of the elongated structure; each of the sheets being formed of a material having a permeability of 1<mu<7 or a dielectric constant epsi of 1<epsi<130; and a feeding terminal coupled to one end of the spiral antenna so that the antenna unit forms a mono-pole antenna, the antenna unit and the ground part together functioning as a dipole antenna.

An antenna has a central core with a central coupling region. A pair of helix antenna lines is formed a surface of the central core. A balun transformer is formed on a circuit board and electrically coupled to the pair of radiating antenna lines. Wherein, the circuit board has a protruding structure to affixing into the central coupling region of the central core. A signal input / output (I / O) end of the antenna is at another end of the balun transformer. The balun transformer preferably uses the LC resonators in two paths with a desired equivalent resonant length, so as to preferably produce the difference by half wavelength.

A security tag includes an EAS component having a defined surface area, and an RFID component having a defined surface area. The EAS component surface area is configured to at least partially overlap the RFID component surface area. The RFID component includes an antenna which at least partially overlaps the first surface. A substantially planar spacer having a thickness is at least partially disposed between the defined surface areas of the EAS and RFID components. The RFID element read range is affected and controlled by the spacing between the RFID element and the EAS element. The RFID reader is capable of activating the RFID component when the RFID component is within the read range. The antenna includes a magnetic loop antenna in electrical contact with a spiral antenna to increase near field read response.

An antenna for a transponder comprises a magnetic core composed of layered amorphous metallic thin plates or composite plates of soft magnetic flakes and a synthetic resin, and a coil wound on the magnetic core. A transponder comprises two antennas set forth above, and a spiral antenna.

A low-profile antenna provides dual simultaneous operation. A first antenna has a circular polarization radiation pattern. A monopole antenna includes a hollow tube and is top-loaded by locating a disk on top of the hollow tube. A support structure positions the monopole antenna between the first antenna and a ground plane. The first antenna is a four arm spiral antenna. The four arm spiral antenna and monopole antenna are each fed by a cable with a first conductor and a second conductor. The radiation pattern of the four arm spiral antenna is maximum at forty-five degrees above the horizon and is null toward the horizon. The cable excites the monopole antenna with respect to the ground plane to transmit / receive vertical polarized signals. The radiation pattern of the monopole antenna is maximum towards the horizon. The first antenna and the monopole antenna operate simultaneously.

A spiral antenna system optimized to transmit and / or receive linearly polarized signals and circularly polarized signals. The antenna system includes a spiral antenna and a circuit for exciting the spiral antenna to transmit or receive linearly polarized and circularly polarized signals simultaneously.

An antenna structure for receiving digital television broadcast signals includes a vase antenna housing having a generally hourglass shape with conically-shaped upper and lower segments joined together to define a narrower diameter middle portion. The antenna structure further includes a signal receiving antenna etched on the inner surface of the vase antenna housing. The signal receiving antenna conforms to the shape of the vase antenna housing and thereby exhibits an arcuate, partial hourglass shape. The signal receiving antenna may be a cloverleaf antenna or a spiral antenna.

The invention discloses a spiral trumpet shaped microwave energy reclaiming antenna and an array microwave heating apparatus thereof, and relates to microwave heating technology in microwave energy application technology. In the energy reclaiming antenna, a conical trumpet cylinder (15) is eccentrically arranged on a magnetron (12) through a trumpet antenna soleplate (17); and a spiral antenna (14) is arranged on an output antenna head (13) of the magnetron (12). In the microwave heating apparatus of the spiral trumpet shaped microwave energy reclaiming antenna array, the microwave energy reclaiming antenna array is formed by arranging a plurality of spiral trumpet shaped microwave energy reclaiming antennas (1) in delta staggered mode, and radiation ports of all the spiral trumpet shaped microwave energy reclaiming antennas (1) are upward. The spiral trumpet shaped microwave energy reclaiming antenna improves microwave power output efficiency; and the microwave heating apparatus of the spiral trumpet shaped microwave energy reclaiming antenna array has the advantages of higher microwave power output efficiency and coupling efficiency, even heating and smooth moisture discharge, improves working reliability and service life of the magnetron, and saves production and maintenance cost of equipment.

The SAW sensor in a stainless steel button package having a diaphragm and mounted on a threaded port. Package can hermetically seal a sensor and RFID-antenna assemblies from media. Sensor diaphragm is exposable to media. Sensor and RFID antennas communicate electrically with SAW sensor and RFID device, respectively, for sensor measurements and identification. Antennas receive RF interrogation signal from a nearby interrogator / transceiver and send reflected RF signals back to the interrogator unit containing sensor measurement and sensor ID. TRF signal excites a SAW resonator inside the sensor and causes the SAW to resonate wherein resonant frequency changes with pressure and temperature applied to the sensor. Antennas could be printed circuit board antennas, helical antennas, loop antennas, any other commercially available off-the-shelf antennas or a combination of these.

The invention discloses a rotating unit type double-frequency circular polarization reflective array antenna which comprises a circular polarization feed source and a reflective array. The circular polarization feed source comprises an axial mode spiral antenna. The reflective array is formed by a high band unit and a low band unit in an alternating-arraying mode. The high band unit and the low band unit carry out phase compensation in a rotating-band-unit mode, and accordingly the fact that after feed source irradiation, the reflective array can emit identical-phase circular polarization wave beams at the two bands can be guaranteed. A rotating technology is introduced to the units at the two bands on the same layer of array face, and cross coupling between the two bands is effectively lowered. The reflective array is of a single-layer structure, so that the array structure is simple and light.

The invention discloses a dielectric-loaded circular-polarized quadrifilar helix antenna of a power-division phase-shift feed network. The broadband feed network directly carries out equal amplitude and 90-degree phase difference feed on a four-wire helix antenna, thereby overcoming the problems of narrow bandwidth, inconvenient regulation and correction and high processing requirements of the traditional circular-polarized quadrifilar helix antenna which produces the 90-degree phase difference by self-phase-shift and simultaneously avoiding the need of designing balun due to unbalanced feed.The dielectric-loaded circular-polarized quadrifilar helix antenna has the advantages of compact structure, simple design and excellent broadband polarization property, thereby being very applicable to portable mobile terminals.

A portable neutron generator includes a Radio Frequency Quadrupole linear accelerator designed to accelerate charged particles of hydrogen (protons) to energies useful for producing neutrons with the (p,n) reaction on lithium. The ion source is driven by a coaxial feed and a spiral antenna to couple the microwave power into the plasma. The linear accelerator is driven by a 600 MHz pulsed RF power supply. A differential pumping scheme is used to balance the need for a high gas load on the ion source end and good vacuum on the accelerator end.

The hybrid antenna includes a spiral antenna, e.g. a log spiral antenna, and a patch array layer adjacent to the spiral antenna and including a passive periodic patch array of conductive patch elements. A conductive ground plane may be adjacent to the patch array layer, and a dielectric layer may be between the conductive ground plane and the patch array. The spiral antenna may include an upper antenna arm, a lower antenna arm and a dielectric sheet therebetween. Each of the upper and lower antenna arms may be a printed planar conductive trace that is wider at a distal end thereof with respect to a center of the log spiral antenna. The patch or periodic array layer operates in conjunction with the ground plane to couple energy into the spiral antenna and thereby improve low frequency antenna efficiency while maintaining electrically small dimensions.

The present invention is directed to an integrated antenna and feed network assembly. The integrated antenna and feed network assembly includes a spiral antenna which is suitable for implementation with ELINT DF systems. The integrated antenna and feed network assembly further includes a feed network, which may include a stripline Balun feed. The feed network is electrically connected to the antenna. Further, the integrated antenna and the feed network assembly provides for integration of the antenna and the feed network into a single PCB assembly.

A system includes a support device and an elongated spiral antenna coupled to the support device. The elongated spiral antenna has a contracted portion and an expanded portion. The expanded portion provides beam steering and directivity. The system also includes a feed line coupled to the elongated spiral antenna. A method for forming the elongated spiral antenna uses a predetermined formula to form arms of the elongated spiral antenna. The arms can be formed by printing the arms on a printed circuit board.

The invention belongs to the technical field of antennas, provides an ultra-wideband low-profile circularly-polarized two-arm spiral antenna, and aims at solving the contradiction of consideration of ultra-wideband, low profile, circular polarization and high gain development of an existing spiral antenna. The spiral antenna comprises a back cavity, a radiator dielectric substrate, an antenna spiral arm, a balun and a coaxial joint, wherein a feeding port is formed in the center of the radiator dielectric substrate; the antenna spiral arm is located on the upper surface of the radiator dielectric substrate and is connected with the upper end of the balun through the feeding port; the balun is located in the back cavity; the lower end of the balun is connected with the coaxial joint; the back cavity comprises a cylinder and a slope; the cylinder is arranged at the center of the back cavity; the slope is connected with the cylinder; the cylinder and the slope jointly form a circular truncated cone; an annular groove and a window are formed in the cylinder; and the window is used for arranging the balun. By the spiral antenna provided by the invention, the performance requirements of the wide band, low profile, circular polarization and high gain of the spiral antenna are well considered; and meanwhile, the frequency band bandwidth of the antenna is greatly improved.

The invention discloses a double circular polarization backfire antenna for double band, which comprises a high-frequency circular polarization antenna component (2), a low-frequency circular polarization antenna component (3) and a reflecting cavity component (1) mutually used by the two; the high-frequency circular polarization antenna component (2) comprises a high-frequency feeding component (21) and a high-frequency primary radiator; the low-frequency circular polarization antenna component (3) comprises a low-frequency feeding component (31) and a low-frequency primary radiator; the high-frequency and low-frequency feeding components are formed by the metal helical wires twisting on medium supports of the helical wires; the low-frequency circular polarization antenna component (3) is sheathed on the outside of the high-frequency circular polarization antenna component (2), and the two are coaxially fixed on the center position of the reflecting cavity component (1); the rotary directions of the metal helical wires of the high-frequency and low-frequency feeding components are opposite. The reception and transmission of the antenna of the invention separately work in two different bands, and two polarizations of the double circular polarization antenna are perpendicular to each other, thereby increasing the polarization isolation between the two bands and improving the overall performance of the system.

The invention provides a dual-band stacking medium loading spiral antenna, comprising two coaxial cylinder bodies with the upper part and the lower part stacked together; the sections of the bottom surface and the bottom part of the two cylinder bodies are provided with metal layers respectively, and the top ends thereof are respectively provided with four metal sheets with different lengths; one end of each metal sheet respectively extends radially from the center of the cylinder body to the circumference of the top surface and then to the metal layer axially in the spiral path from the surface of the metal sheet; the opposite surfaces of two adjacent metal sheets of the upper cylinder bodies are connected as two groups of antennas; the four metal sheets of the upper cylinder body and the lower cylinder body are respectively connected on the top end surface of the lower cylinder body; the dual-band stacking medium loading spiral antenna also comprises a cable which is embedded inside the through hole of the axle center and comprises an insulation body; the surface of the insulation body is covered by a conductive shield layer and the center thereof is provided with a feed-in needle; two ends of the feed-in needle extend out of the through hole; the top end of the conductive shield layer is connected with a group of the antennas of the upper cylinder body; the top end of the feed-in needle is connected with the other group of antennas of the upper cylinder body; the metal layers of the bottom surfaces of the upper cylinder body and the lower cylinder body respectively contact with the horizontal corresponding sections of the conductive shield layer. The antenna of the invention has small dimension and good performance.

The invention relates to a high-gain planar wide-frequency antenna which relates to a microwave technology and comprises an Archimedean spiral antenna radiation sheet, a tapered balun and a shell, wherein a reflection cavity is arranged in the shell, and the Archimedean spiral antenna radiation sheet is connected with a signal source accessing end through the tapered balun. The invention has the advantages that the gain of a wide-frequency spiral antenna is improved to a great degree, the circular polarization characteristic of far-field radiation is good, and meanwhile, the standing wave of the whole antenna system also has better performance. The invention has high gain, stable gain, lower axial ratio and wide application potential in the aspects of military affairs and civil use.

The invention relates to an ultra-wideband planar spiral antenna with a back cavity in the technical field of the wireless communication. The antenna comprises an input and output port, an involute coaxial balun line, a planar spiral antenna, a medium plate and a metallic back cavity, wherein the planar spiral antenna is a metallic patch calculated by a spiral equation, and positioned on the face of the medium plate; the metallic back cavity is a curved surface of a paraboloid and positioned on the back surface of the medium plate; the internal conductor and the external conductor of the involute coaxial balun line are respectively connected with the two arms of the planar spiral antenna; the core of the input and output port is connected with the internal conductor of the coaxial balun line. The standing wave ratio of the ultra-wideband planar spiral antenna is smaller than two within the range of 0.36-6.83GHz, and the antenna gain is about 10dB within the range of 2-6GHz. Therefore the ultra-wideband planar spiral antenna is an antenna with high gain and ultra wideband; the ultra-wideband planar spiral antenna also has the advantages of simple structure and low section.