Alhaddad A.G.,University of Bradford |
Abd-Alhameed R.A.,University of Bradford |
Zhou D.,Vertu Ltd. |
See C.H.,University of Bradford |
And 2 more authors.
IEEE Transactions on Antennas and Propagation
A novel balanced rectangular loop antenna is proposed, having an ungrounded coplanar waveguide (CPW) feed configuration and a folded structure at both ends. This antenna is designed for operation over the 2.4 GHz and 5 GHz WLAN frequency bands. Bond-wire bridges are used along the CPW feed line to ensure the same potential across the CPW ground planes. The self-balancing structure that can be realized in a loop antenna offers operation without the need of a separate balun for connection to a RF source. A prototype of the optimized antenna with overall dimension of 31 mm$\,\times \,$16 mm$\,\times \,$3 mm was fabricated and tested. The calculated and measured results show good agreement, confirming good wideband characteristics with multiband operation. An example application of the proposed antenna is studied when used in handheld devices. The results show that this antenna has performance largely independent of perturbations of its associated ground plane, because the balanced feed created by the intrinsic balun structure minimizes ground plane currents. © 1963-2012 IEEE. Source
VERTU CORPORATION Ltd | Date: 2013-05-30
A cover part includes a radio frequency transparent woven fabric layer arranged within the cover part; and a radio frequency transparent coating layer arranged within the cover part, at least partially in contact with the radio frequency transparent woven fabric layer, the coating layer configured to change appearance of the cover part, wherein the cover part being configured to pass radio frequency signals through the cover part.
Vertu Corporation Ltd and Nokia Inc. | Date: 2010-01-26
Accessories for mobile phones, namely, chargers, desk stands, headsets, wireless headsets, memory card readers, flash memory drives, powers supply connectors and adaptors for use with portable electronic devices, phone charms, digital media hubs. watches, tie clips, cufflinks, key rings made of precious metal, key fobs made of precious metal. Money clips, pens, paper knives. Leather key cases, wallets, purses, suitcases, briefcases, leather phone cases.
Vertu Corporation Ltd | Date: 2014-08-13
Mobile phones; smart phones; accessories and replacement parts for mobile phones and smart phones; styluses and carrying cases for mobile phones and smart phones; phone charms; mobile phone accessory charms; headsets; answering machines; anti-interference devices; audio speakers; audiovisual teaching apparatus; automated teller machines; bar code readers; buzzers; camcorders; chargers; chips; cinematographic cameras; circuit breakers; circuit closers; close-up lenses; commutators; compact discs; compact discs; compact disc players; compasses; computer keyboards; computer peripheral devices; computer memory devices; conductors, electric; connections for electric lines; control panels; converters, electric; couplers; couplings, electric / connections, electric; data and video cables; dictating machines; disk drives for computers; distance measuring apparatus; distance recording apparatus; downloadable computer software applications; downloadable ring tones for mobile phones; downloadable music files; downloadable image files; DVD players; electricity conduits; electro-dynamic apparatus for the remote control of signals; electromagnetic coils; electronic apparatus for commutation; electronic publications, downloadable; electronic notice boards; electronic pens; electronic pocket translators; electronic agendas; electronic book readers; electronic wristband to track physical activity; encoded identification bracelets, magnetic; encoded magnetic cards; encoded key cards; enlarging apparatus; facsimile machines; filters for ultraviolet rays, for photography; flash-bulbs; flashing lights / blinkers; flashlights; frequency meters; fuse wire / wires of metal alloys; fuses; global Positioning System apparatus; grids for batteries; handheld and mobile digital electronic devices for the sending and receiving of telephone calls, electronic mail and other digital data; hands free kits for phones; heat regulating apparatus; identity cards, magnetic; in-ear headphones; inductors; integrated circuit cards / smart cards; integrated circuits; intercommunication apparatus; interfaces for computers; inverters; laptop computers; light dimmers; light-emitting electronic pointers; light-emitting diodes; locks, electric; loudspeakers; magnetic data media; magnetic wires; masts for wireless aerials; measuring apparatus; memory cards; microphones; microprocessors; microscopes; mobile telephone applications; mobile telephone covers; mobile telephone cases; mobile telephone software; monitoring apparatus, electric monitors; monitors; mouse; mouse pads; MP3 and other digital format audio players; navigation apparatus for vehicles; navigational instruments; notebook computers; portable media players; printed circuits; printed circuit boards; printers for use with computers; radio pagers; radiological apparatus for industrial purposes; radios; resistances, electric; satellite navigational apparatus; satellites for scientific purposes; scanners; ; screens; sound transmitting apparatus; sound recording carriers; sound recording apparatus; sounding apparatus and machines; stereo headphones; stereo speakers; switchboards; switchboxes; electric; tablet computers; tachometers; tape recorders; taximeters; telegraph wires; telegraphs; telephone apparatus; telephone receivers; telephone transmitters; telephone wires; teleprinters / teletypewriters; teleprompters; telescopes; television apparatus; transformers; transistors; transmitters of electronic signals; transmitters; transmitting sets; transponders; wire connectors; wires, electric; wireless chargers; wireless headsets; wireless speakers; computers; readers; USB flash drives; counters; electronic tags for goods; photocopiers; weighing apparatus and instruments; measures; mechanical signs; portable telephones; cell phone straps; telephone sheath; headphones; cameras; measuring apparatus; semi-conductors; coils, electric; video screens; remote control apparatus; optical fibers; regulating apparatus, electric; lightning arresters; electrolysers.
Vertu Corporation Ltd | Date: 2015-09-04
An optical element, having a length in a direction of a first axis and a width in a direction of a second axis, wherein the length is greater than or equal to the width. The optical element includes a sapphire crystallographic structure having a plurality of crystal planes, wherein a first crystal plane axis is configured to be perpendicular to the first and the second axis, a second crystal plane axis is configured to be parallel to the first axis and a third crystal plane axis is configured to be parallel to the second axis.