2065 results about "Slot antenna" patented technology

A wireless communication system is provided that includes an antenna structure adapted for coupling to a medical device antenna when the medical device is not implanted in a patient's body. The antenna structure effectively extends the medical device antenna length, thereby improving the efficiency and reliability of a communication link between the medical device and a programmer or monitor outside the implanted environment. The antenna structure is fabricated from any conductive material, which may be in the form of conductive wire, tape, ink, foil, film, adhesive or the like, and is attached to a portion of a medical device packaging assembly or another accessory device or substrate such as a pouch or overlay. The antenna structure may be a monopole, dipole, slot antenna, microstrip patch, or loop antenna, and may be fixed or movable relative to the substrate on which it is implemented.

In a plasma processing apparatus, microwaves being transmitted in a waveguide pass through a microwave transmitted window via first and second slot antennas provided in a magnetic field side, so as to form surface waves. Process gas in a chamber is excited by the surface waves so as to generate surface wave plasma. A substrate is processed by the plasma. Each first slot antenna is provided with an aperture, which has a curved or bent shape and whose longitudinal direction extends substantially to follow the lines of magnetic force of the microwaves. Each second slot antenna is provided with an aperture which has a rectangular shape.

A small antenna has two or more feeding ports. A radiator is made of a planar conductor having a substantially circular shape having the diameter of a substantially half wavelength or a substantially regularly polygonal shape where the length of a diagonal line passes through the center point is the substantially half wavelength. A ground plate is faced to the radiator. On the radiator, the feeding ports are connected to feeding points on two orthogonal line segments passing through the center of the radiator. This antenna is used as not only a single antenna but also two independent antennas having secured isolation between the feeding ports. A small antenna device used as two independent antennas is thus provided. The radiator is formed in a hat shape having an edge, has an Stepped Impedance Resonator (SIR) structure where the diameter of a crest part is a quarter wavelength, and is shortened.

The present invention refers to an antenna diversity system comprising at least a first antenna and a second antenna wherein the first antenna substantially behaves as an electric current source or as a magnetic current source, and the second antenna substantially behaves as an electric current source or as a magnetic current source and a corresponding wireless device. Further the invention relates to an SMT-type slot-antenna component comprising at least one conductive surface or sheet of metal in which the pattern of a slot is created, at least one contact terminal accessible from the exterior of said component to electrically connect the conductive surface included in the slot-antenna component with the ground plane of a circuit board such as a printed circuit board and a corresponding wireless device.

An array antenna device includes a plurality of slot array antennas which are arranged and each of which includes a plurality of slot antennas and a radiation surface, which is formed to be conformal, and a plurality of waveguides each of which supplies respective power to each of the slot array antennas. After bodies of the waveguides are formed by a resin molding method, surface treatment is performed with respect to inner surfaces of the waveguides with plating.

Briefly, in accordance with one embodiment of the invention, a slot antenna may include a primary slot and one or more secondary slots. The size of the antenna may be reduced by adding one or more of the secondary slots which may add additional inductance to the antenna. Furthermore, the size of the antenna may be reduced by increasing the inductance of the secondary slots via increasing the length of the slots or by changing the shape of the slots. The antenna may include one or more MEMS varactors coupled to one or more of the secondary slots. The resonant frequency of the slot antenna may be tuned to a desired frequency by changing the capacitance value of one or more of the MEMS varactors to a desired capacitance value.

An apparatus includes a slot defined by electrically conductive material, an electrically conductive element extending generally transversely to the slot in the region of a first end thereof, and a balun portion communicating with the first end of the slot, the balun portion having a high impedance and being configured to provide a selected degree of absorption of electromagnetic energy.

A dielectric waveguide slot antenna which is capable of radiating a circularly-polarized wave comprises: a dielectric waveguide having a slot through which a dielectric is exposed in a part of an electrically conductive film formed on a surface of the dielectric waveguide; a printed circuit board having a via hole opposed to the slot with the same shape as that of the slot; and a conductor plate having a first through-hole opposed to and having approximately the same shape as the via hole, and a pair of second through-holes in a vicinity of the first through-hole. The dielectric waveguide, the printed circuit board and the conductor plate are joined together with aligning the slot, the via hole and the first through-hole with each other. The printed circuit board has a conductor layer formed in positions facing to the second through-holes, and the second through-holes are arranged point-symmetrically with each other.

A handheld electronic device is provided that contains wireless communications circuitry. The wireless communications circuitry may include antennas. An antenna in the handheld electronic device may have a ground plane element. A slot antenna resonating element may be formed from an opening in the ground plane element. A near-field-coupled antenna resonating element may be electromagnetically coupled to the slot antenna resonating element through electromagnetic near-field coupling. A transmission line may directly feed the slot antenna resonating element. The transmission line may indirectly feed the near-field-coupled antenna resonating element through the slot antenna resonating element. The slot antenna resonating element may have one or more associated resonant frequencies and the near-field-coupled antenna resonating element may have one or more associated resonant frequencies. The antenna may be configured to cover one or more distinct communications bands.

A multifunction printed antenna for wireless and telematic applications. In one embodiment, GPS and satellite radio patch antenna elements are printed on one side of a printed circuit board and AMPS, PCS, GSM and terrestrial radio slot antenna elements are etched in a ground plane on an opposite side of the same printed circuit board. In an alternate embodiment, the GPS and satellite radio patch antenna elements are elements mounted on one printed circuit board and the AMPS, GSM, PCS and terrestrial radio slot antenna elements are etched in a ground plane on another printed circuit board rigidly secured orthogonal to the GPS and satellite printed circuit board. The AMPS, GSM and PCS circuit board can be curved to reduce the nulls at the edges of the circuit board. Further, the edge of the AMPS, GSM and PCS circuit board that contacts the GPS and satellite radio circuit board can have a saw-tooth pattern so that edge currents are reduced.

Briefly, in accordance with one embodiment of the invention, a slot antenna may include a primary slot and one or more secondary slots. The size of the antenna may be reduced by adding one or more of the secondary slots which may add additional inductance to the antenna. Furthermore, the size of the antenna may be reduced by increasing the inductance of the secondary slots via increasing the length of the slots or by changing the shape of the slots. The antenna may include one or more MEMS varactors coupled to one or more of the secondary slots. The resonant frequency of the slot antenna may be tuned to a desired frequency by changing the capacitance value of one or more of the MEMS varactors to a desired capacitance value.

The invention concerns a wrist-wearable electronic device comprising a slot antenna and a method of manufacturing the slot antenna. Such a device comprises an outer housing defining an assembly zone and a radio unit contained within the assembly zone. According to the invention the outer housing is made at least partly of conductive material and comprises an integral slot antenna formed in the conductive material portion thereof, the antenna being electrically connected to the radio unit. The invention provides a convenient antenna structure for wirelessly communicating wristop computers and the like.

Overhead antenna live inventory locating systems and methods are provided. The overhead antenna inventory / locating system can include a plurality of antennas mounted in an elevated support structure. The antennas can be coupled to RFID readers that interrogate electronic tags. The inventory system can analyze the information received from the detected electronic tags and produce inventory data and location information for the tags. The antennas can be patch antennas mounted to ceiling tiles such that they can be positioned in the ceiling of a facility. The antennas can be configured to provide broad coverage from a relatively low ceiling height. The low-cost antennas can be configured in such a way as to provide accurate location information for detected tags. The inventory system can be configured to provide near real-time inventory and location information.

A high-isolation slot antenna array relates to a multi-input multi-output antenna. The antenna is composed of three slot antennas which are arranged together, the radiation polarization directions of every two slot antennas intersect, and each slot antenna is formed by a micro-strip feeder on a dielectric substrate and a metal ground plane. A radiation slit and a plurality of isolation slots are formed in the metal ground plane. The isolation slots are formed in the periphery of the radiation slit, and the isolation slots are parallel to each other. The long side direction of the radiation slit is perpendicular to the long side direction of the isolation slots, and the length of the isolation slots enables the resonance frequency to be lower than the working efficiency of the antennas. An antenna input output port is formed in one end of the micro-strip feeder, a metal short circuit needle is arranged at the tail end of a micro-strip feeder conduction band at the other end of the micro-strip feeder, and the conduction band and the metal ground plane are connected on the edge of the radiation slit through the metal short circuit needle. The antenna can effectively reduce adverse effects of shielding and isolation of the metal ground plane on antenna normal radiation.